Re: [Yade-users] [Question #686942]: What is random close packing and random loose packing
Question #686942 on Yade changed: https://answers.launchpad.net/yade/+question/686942 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Robert Caulk, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #686942]: What is random close packing and random loose packing
New question #686942 on Yade: https://answers.launchpad.net/yade/+question/686942 Hi, I have trouble with the 'makecloud' The document says makecloud create random very loose packing enclosed in a parallelepiped. What is random very loose packing? Does it have a mathematical definition? I've seen several articles but didn't understand the distribution clearly. Thanks in advance! -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #688156]: How to create a regular prism in Yade
Question #688156 on Yade changed: https://answers.launchpad.net/yade/+question/688156 Huang peilun posted a new comment: I want to create a body shaped as a prism. By "not round cylinder" I mean not the cylinder for yade.gridpfacet module, I see from the yade book that there is a class yade.wrapper.Cylinder. However, I tried couple of times, I can't create a body shaped as a cylinder by this class. Thanks. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #688156]: How to create a regular prism in Yade
Question #688156 on Yade changed: https://answers.launchpad.net/yade/+question/688156 Huang peilun posted a new comment: Thank you, Jan! That solved my problem. I'll post what I have tried and why/how it went wrong. This time I just use O.bodies.append(Cylinder(length=1, radius=1)) I didn't figure out what type does the Cylinder class have. I want to make a penetration test, and I want a cylinder shaped rod to do this. Here's another question, I want to apply gravity to this cylinder and have contact with spheres, what kind of IGeomFunctor and LawFunctor should I use? Now the current script is as followed. The cylinder just disappeared at the beginning of the simulation. from yade import pack O.bodies.append(geom.facetBox((.5,.5,.5),(.5,.5,.5),wallMask=31)) rod=Body() rod.shape=Cylinder() rod.shape.length=.5 rod.shape.radius=.2 rod.state.pos=(.5,.5,1.8) O.bodies.append(rod) sp=pack.SpherePack() sp.makeCloud((0,0,0),(1,1,1),rMean=.05,rRelFuzz=.3) sp.toSimulation() O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Cylinder_Aabb(),Bo1_Facet_Aabb()]), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom(),Ig2_Sphere_ChainedCylinder_CylScGeom()], [Ip2_FrictMat_FrictMat_FrictPhys()], [Law2_ScGeom_FrictPhys_CundallStrack(),Law2_CylScGeom_FrictPhys_CundallStrack()] ), # update position using Newton's equations NewtonIntegrator(gravity=(0,0,-9.81),damping=0.4), # call the checkUnbalanced function (defined below) every 2 seconds PyRunner(command='checkUnbalanced()',realPeriod=2), ] O.dt=.2*PWaveTimeStep() def checkUnbalanced(): if O.forces.f(rod.id)[2]==0: return ball.state.blockedDOFs='xyXYZ' ball.state.vel=(0,0,2) if unbalancedForce()<.05: O.pause() O.saveTmp() Thanks! -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #688340]: Problem about running yade in parallel
New question #688340 on Yade: https://answers.launchpad.net/yade/+question/688340 Hi everyone! I'm learning to run yadedaily in parallel. I use 'yadedaily --threads=2 test.py' to run my code. First few steps works fine but then comes an error which says: python3.5: /builds/yade-dev/trunk/deb/yadedaily/pkg/common/InsertionSortCollider.hpp:127: yade::InsertionSortCollider::Bounds& yade::InsertionSortCollider::VecBounds::operator[](long int): Assertion `idx < long(size()) && idx >= 0' failed. Aborted (core dumped) Here's my code: from yade import pack SoilMat=FrictMat(young=25e6,poisson=0.2,density=2650,frictionAngle=0.28) O.materials.append((SoilMat)) O.bodies.append(geom.facetCylinder(center=(0,0,.5),radius=.38,height=1,wallMask=6)) sp=pack.SpherePack() sp.makeCloud((-.38,-.38,0),(.38,.38,1),rMean=.025,rRelFuzz=.3) cyl=pack.inCylinder((0,0,0),(0,0,1),.355) sp=pack.filterSpherePack(cyl,sp,True) sp.toSimulation(material=SoilMat) O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()], [Ip2_FrictMat_FrictMat_FrictPhys()], [Law2_ScGeom_FrictPhys_CundallStrack()] ), # update position using Newton's equations NewtonIntegrator(gravity=(0,0,-9.81),damping=0.05), # call the checkUnbalanced function (defined below) every 2 seconds ] O.dt=.2*PWaveTimeStep() O.saveTmp() And when I change the rMean of the spherepack, it works. But I need to simulate a lot of spheres, can anyone help me solve the problem when rMean is small? Thanks in advance! -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #688275]: Size problem in yade simulation
Question #688275 on Yade changed:
https://answers.launchpad.net/yade/+question/688275
Huang peilun posted a new comment:
Thanks!
I increased the stiffness but there still are spheres that go through the
bottom of the cylinder. Here's my code.
from yade import pack
Mat=FrictMat(young=2.06e20)
SoilMat=FrictMat(young=25e6,poisson=0.2,density=2650,frictionAngle=0.28)
O.materials.append((SoilMat,Mat))
O.bodies.append(geom.facetCylinder(center=(500,500,500),radius=500,height=1000,wallMask=6,color=(1,0,0),material=Mat))
sp=pack.SpherePack()
sp.makeCloud((0,0,0),(1000,1000,1000),rMean=50,rRelFuzz=.3)
cyl=pack.inCylinder((500,500,0),(500,500,1000),450)
sp=pack.filterSpherePack(cyl,sp,True)
sp.toSimulation(material=SoilMat)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb(),Bo1_Wall_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
# update position using Newton's equations
NewtonIntegrator(gravity=(0,0,-9.81),damping=0.05),
# call the checkUnbalanced function (defined below) every 2 seconds
PyRunner(command='checkUnbalanced()',realPeriod=2,label='checker'),
]
O.dt=.2*PWaveTimeStep()
def checkUnbalanced():
print('%s: Unbalanced=%s' % (O.iter,unbalancedForce()))
if O.iter<5000: return
if unbalancedForce()<.05:
O.pause()
O.saveTmp()
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Re: [Yade-users] [Question #688340]: Problem about running yade in parallel
Question #688340 on Yade changed: https://answers.launchpad.net/yade/+question/688340 Huang peilun posted a new comment: Thanks for your reply! it's " Yade 20200119-3121~146d6de~xenial1. Ubuntu 16.04 LTS xenial. " I can run the first few steps and then this problem occurs. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #688340]: Problem about running yade in parallel
Question #688340 on Yade changed: https://answers.launchpad.net/yade/+question/688340 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Jérôme Duriez, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #688340]: Problem about running yade in parallel
Question #688340 on Yade changed: https://answers.launchpad.net/yade/+question/688340 Huang peilun posted a new comment: That's great. Thanks! -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #688156]: How to create a regular prism in Yade
Question #688156 on Yade changed: https://answers.launchpad.net/yade/+question/688156 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thank you, Jan! I'll do better next time. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #688275]: Size problem in yade simulation
Question #688275 on Yade changed: https://answers.launchpad.net/yade/+question/688275 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Jan! I tried SoilMat=FrictMat(young=25e9,...) and it works! Now I understand why these spheres go through the cylinder. It's very interesting! -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #688275]: Size problem in yade simulation
Question #688275 on Yade changed: https://answers.launchpad.net/yade/+question/688275 Huang peilun confirmed that the question is solved: Thanks Jan Stránský, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #688275]: Size problem in yade simulation
Question #688275 on Yade changed:
https://answers.launchpad.net/yade/+question/688275
Description changed to:
I did a gravity deposition test in a cylinder. The following is the
original code and it works.
from yade import pack
#material
SoilMat=FrictMat(young=25e6,poisson=0.2,density=2650,frictionAngle=0.28)
O.materials.append((SoilMat))
#define the chamber
O.bodies.append(geom.facetCylinder(center=(.5,.5,.5),radius=.5,height=1,wallMask=6,color=(1,0,0)))
#create foundation by making spheres in the cylinder.
sp=pack.SpherePack()
sp.makeCloud((0,0,0),(1,1,1),rMean=.05,rRelFuzz=.3)
cyl=pack.inCylinder((.5,.5,0),(.5,.5,1),.45)
sp=pack.filterSpherePack(cyl,sp,True)
sp.toSimulation(material=SoilMat)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb(),Bo1_Wall_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
# update position using Newton's equations
NewtonIntegrator(gravity=(0,0,-9.81),damping=0.05),
# call the checkUnbalanced function (defined below) every 2 seconds
PyRunner(command='checkUnbalanced()',realPeriod=2,label='checker'),
]
O.dt=.2*PWaveTimeStep()
def checkUnbalanced():
print('%s: Unbalanced=%s' % (O.iter,unbalancedForce()))
if O.iter<5000: return
if unbalancedForce()<.05:
O.pause()
O.saveTmp()
However, when I magnify all units 1000 times, like the following code, some
sphere just went through the bottom of the cylinder and I don't know why.
from yade import pack
#material
SoilMat=FrictMat(young=25e6,poisson=0.2,density=2650,frictionAngle=0.28)
O.materials.append((SoilMat))
#define the chamber
O.bodies.append(geom.facetCylinder(center=(500,500,500),radius=500,height=1000,wallMask=6,color=(1,0,0)))
#create foundation by making spheres in the cylinder.
sp=pack.SpherePack()
sp.makeCloud((0,0,0),(1000,1000,1000),rMean=50,rRelFuzz=.3)
cyl=pack.inCylinder((500,500,0),(500,500,1000),450)
sp=pack.filterSpherePack(cyl,sp,True)
sp.toSimulation(material=SoilMat)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb(),Bo1_Wall_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
# update position using Newton's equations
NewtonIntegrator(gravity=(0,0,-9.81),damping=0.05),
# call the checkUnbalanced function (defined below) every 2 seconds
PyRunner(command='checkUnbalanced()',realPeriod=2,label='checker'),
]
O.dt=.2*PWaveTimeStep()
def checkUnbalanced():
print('%s: Unbalanced=%s' % (O.iter,unbalancedForce()))
if O.iter<5000: return
if unbalancedForce()<.05:
O.pause()
O.saveTmp()
Thanks in advance!
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Re: [Yade-users] [Question #688275]: Size problem in yade simulation
Question #688275 on Yade changed: https://answers.launchpad.net/yade/+question/688275 Huang peilun posted a new comment: Thanks Robert. I haven't tried increasing the stiffness of the facets because I don't know how. Can you show me how to do that? -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #688275]: Size problem in yade simulation
New question #688275 on Yade:
https://answers.launchpad.net/yade/+question/688275
I did a gravity deposition test in a cylinder. The following is the original
code and it works.
from yade import pack
#material
SoilMat=FrictMat(young=25e6,poisson=0.2,density=2650,frictionAngle=0.28)
O.materials.append((SoilMat))
#define the chamber
O.bodies.append(geom.facetCylinder(center=(.5,.5,.5),radius=.5,height=1,wallMask=6,color=(1,0,0)))
#create foundation by making spheres in the cylinder.
sp=pack.SpherePack()
sp.makeCloud((0,0,0),(1,1,1),rMean=.05,rRelFuzz=.3)
cyl=pack.inCylinder((.5,.5,0),(.5,.5,1),.45)
sp=pack.filterSpherePack(cyl,sp,True)
sp.toSimulation(material=SoilMat)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb(),Bo1_Wall_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
# update position using Newton's equations
NewtonIntegrator(gravity=(0,0,-9.81),damping=0.05),
# call the checkUnbalanced function (defined below) every 2 seconds
PyRunner(command='checkUnbalanced()',realPeriod=2,label='checker'),
]
O.dt=.2*PWaveTimeStep()
def checkUnbalanced():
print('%s: Unbalanced=%s' % (O.iter,unbalancedForce()))
if O.iter<5000: return
if unbalancedForce()<.05:
O.pause()
O.saveTmp()
However, when I magnify all units 1000 times, like the following code, some
sphere just went through the bottom of the cylinder and I don't know why.
from yade import pack
#material
SoilMat=FrictMat(young=25e6,poisson=0.2,density=2650,frictionAngle=0.28)
O.materials.append((SoilMat))
#define the chamber
O.bodies.append(geom.facetCylinder(center=(500,500,500),radius=500,height=1000,wallMask=6,color=(1,0,0)))
#create foundation by making spheres in the cylinder.
sp=pack.SpherePack()
sp.makeCloud((0,0,0),(1000,1000,1000),rMean=50,rRelFuzz=.3)
cyl=pack.inCylinder((500,500,0),(500,500,1000),450)
sp=pack.filterSpherePack(cyl,sp,True)
sp.toSimulation(material=SoilMat)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb(),Bo1_Wall_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
# update position using Newton's equations
NewtonIntegrator(gravity=(0,0,-9.81),damping=0.05),
# call the checkUnbalanced function (defined below) every 2 seconds
PyRunner(command='checkUnbalanced()',realPeriod=2,label='checker'),
]
O.dt=.2*PWaveTimeStep()
def checkUnbalanced():
print('%s: Unbalanced=%s' % (O.iter,unbalancedForce()))
if O.iter<5000: return
if unbalancedForce()<.05:
O.pause()
O.saveTmp()
Thanks in advance!
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[Yade-users] [Question #688156]: How to create a regular prism in Yade
New question #688156 on Yade: https://answers.launchpad.net/yade/+question/688156 Hi, I just begin to learn Yade. I'm wondering if there is a function or method to create a regular prism without calculate the coordinates of each vertexes by myself. And if there is a method to create a cylinder(not a round cylinder). Thanks in advance. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #690752]: How to know the force applied to each particle when Flowengine is activited
Question #690752 on Yade changed: https://answers.launchpad.net/yade/+question/690752 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Robert Caulk, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #690752]: How to know the force applied to each particle when Flowengine is activited
New question #690752 on Yade:
https://answers.launchpad.net/yade/+question/690752
Hi, I just begin to learn the Flowengine. My code is as followed:
import numpy as np
from yade import pack, plot, polyhedra_utils
#define the material(Fontainebleau Sand)
SteelMat = PolyhedraMat(young=2.06e11,poisson=.3,density=7890,frictionAngle=0.3)
SoilMat=FrictMat(young=1e7,poisson=0.2,density=2650,frictionAngle=0.273)
O.materials.append((SteelMat,SoilMat))
#define the chamber
O.bodies.append(geom.facetBox((0,0,2),(0.4,0.4,2),wallMask=31))
#create foundation by making spheres in the cylinder.
sp=pack.SpherePack()
sp.makeCloud((-.4,-.4,0),(.4,.4,4),rMean=.04,rRelFuzz=.5)
sp.toSimulation(material=SoilMat)
#Engine of the simulation
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Polyhedra_Aabb(),Bo1_Sphere_Aabb(),Bo1_Facet_Aabb(),Bo1_Wall_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Polyhedra_ScGeom(),Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys(),Ip2_FrictMat_PolyhedraMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
NewtonIntegrator(gravity=(0,0,-9.81),damping=0.2),
#introduced as a dead engine for the moment
FlowEngine(dead=1,label="flow"),
#Run the specific controlled motion.
PyRunner(command='start()',realPeriod=2,label='checker'),
]
#Time step
O.dt=PWaveTimeStep()
def start():
print('\n# Simulation begins #')
print('Stage: Gravitity desposition.')
print('Time step is %ss.' % O.dt)
checker.command='checkUnbalanced()'
def checkUnbalanced():
print('%s:UnbalancedForce=%s' % (O.iter,unbalancedForce()))
if max([b.state.pos[2]+b.shape.radius for b in O.bodies if
isinstance(b.shape,Sphere)])>2: return
if unbalancedForce()>0.01: return
checker.command='Active_Flowengine()'
#Compress the soil to achieve a certain dry density of 1.5g/cm^3.
def Active_Flowengine():
flow.dead=0
flow.meshUpdateInterval=200
flow.useSolver=3
flow.permeabilityFactor=1
flow.viscosity=10
flow.bndCondIsPressure=[0,0,0,0,0,1]
flow.bndCondValue=[0,0,0,0,0,0]
flow.boundaryUseMaxMin=[1,1,1,1,1,1]
newton.damping=0
checker.command='Create_Ball()'
def Create_Ball():
#Ball=sphere((0,0,1.6),0.1243186,material=SteelMat)
Cube=polyhedra_utils.polyhedra(SteelMat,(.1,.1,.1),v=((0.05,0.05,1.6),(-0.05,0.05,1.6),(0.05,-0.05,1.6),(-0.05,-0.05,1.6),(0.05,0.05,1.7),(-0.05,0.05,1.7),(0.05,-0.05,1.7),(-0.05,-0.05,1.7)))
O.bodies.append(Cube)
global Cube
#flow.ignoredBody=Cube.id
checker.command='Fall()'
def Fall():
print(O.forces.f(Cube.id)[2])
Here's my question. After the gravity deposition completed and the FlowEngine
activated, it shows that the force of the cube element is always zero. Even if
the cube element has a direct contact with other balls. There must be something
wrong.
Can anyone help me out?
Thanks in advance.
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Re: [Yade-users] [Question #692650]: How to use the DFNFlowEngine
Question #692650 on Yade changed: https://answers.launchpad.net/yade/+question/692650 Huang peilun posted a new comment: Thanks for your advice, Robert. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #692704]: Using flow engine got the wrong pressure field
Question #692704 on Yade changed: https://answers.launchpad.net/yade/+question/692704 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Robert, it's indeed a stability problem. I tried the radius expansion method, I think it's a fast way to generate stable sample. Anyway, both method (the old one I used before and the radius expansion method) can get the reasonable result in the end. It's just a matter of time. I think the answer to my question is to find a way to generate particles that can reach force balance quickly. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #692650]: How to use the DFNFlowEngine
Question #692650 on Yade changed: https://answers.launchpad.net/yade/+question/692650 Status: Open => Solved Huang peilun confirmed that the question is solved: Thanks Jérôme Duriez, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #692704]: Using flow engine got the wrong pressure field
New question #692704 on Yade:
https://answers.launchpad.net/yade/+question/692704
Hi,
I'm currently simulating a simple seepage problem. My code is as followed:
from yade import pack, plot, ymport
from numpy import genfromtxt
mn,mx=Vector3(-.25,-.25,0),Vector3(.25,.25,.5)
SoilMat=CohFrictMat(young=20e9,poisson=0.3,density=2650,frictionAngle=0.7,alphaKr=50,alphaKtw=50,momentRotationLaw=True)
O.materials.append((SoilMat))
O.materials.append(CohFrictMat(young=10e9,poisson=0.5,frictionAngle=0,density=0,label='walls',momentRotationLaw=True))
walls=aabbWalls([mn,mx],thickness=0,material='walls')
wallIds=O.bodies.append(walls)
O.bodies.append(ymport.text('/home/jp/DEMSimulation/Sample/SP-TestSample5.txt',material=SoilMat))
newton=NewtonIntegrator(damping=0.3)
#Engine of the simulation
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Box_Aabb(),Bo1_Sphere_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Box_Sphere_ScGeom6D(),Ig2_Facet_Sphere_ScGeom6D()],
[Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()],
[Law2_ScGeom6D_CohFrictPhys_CohesionMoment()]
),
FlowEngine(dead=1,label="flow"),
newton,
]
#Time step
O.dt=.1*PWaveTimeStep()
O.run(1,1)
newton.damping=0
flow.dead=0
flow.defTolerance=0.3
flow.meshUpdateInterval=200
flow.useSolver=3
flow.permeabilityFactor=1
flow.viscosity=10
flow.bndCondIsPressure=[0,0,0,0,1,1]
flow.bndCondValue=[0,0,0,0,100,0]
flow.boundaryUseMaxMin=[0,0,0,0,0,0]
The problem is that the first iteration gives the right result, like [1], while
the second and the following gives a wrong pressure field. The pore pressure of
some cells may reach -1 and more, like [2].
I think the problem is with the sample. When I change the SP-TestSample5.txt to
the following code:
sp=pack.SpherePack()
sp.makeCloud((-.25,-.25,0),(.25,.25,.5),rMean=.0175,rRelFuzz=.5)
sp.toSimulation(material=SoilMat)
the result is reasonable again.
However, I don't know what's wrong with the sample of SP-TestSample5.txt. This
txt file can be found in [3]. The way I generate the SP-TestSample5.txt can be
found in [4]. Any idea why this happens?
Thank you,
Peilun
[1]https://cloud.tsinghua.edu.cn/f/d076877a726b47808591/
[2]https://cloud.tsinghua.edu.cn/f/ba447f257ddb4caf90e9/
[3]https://cloud.tsinghua.edu.cn/f/7e8ede6246554253aa64/
[4]https://cloud.tsinghua.edu.cn/f/ec0e4790e006474f9c09/
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Re: [Yade-users] [Question #692704]: Using flow engine got the wrong pressure field
Question #692704 on Yade changed:
https://answers.launchpad.net/yade/+question/692704
Huang peilun posted a new comment:
Hi Robert,
Thank you for answering my question. I'm sorry that I didn't read the
posting guidelines carefully. I'll follow the guidelines in the future.
As for the issue, I tried decreasing the time step and turning
O.dynDt=False.
The result is almost the same. I noticed that the pressure field can be
calculated by the following formula:
GP=Ev+Qq+Qp
where G is the conductivity matrix, P is the column vector containing
all values of pressure, and E is the matrix defining the rates of volume
change. Qq and Qp are flux vectors reflecting boundary conditions,
respectively source terms (imposed fluxes) in Qq and imposed pressures
in Qp.
I checked the initial velocity of my sample, it appears that all
particles have a high velocity, thus in the second iteration gives a
'unreasonable' pressure field. I tried to slow down the particles, and
the result is more and more 'reasonable'. Therefore, I think the way I
generate the sample is improper. The code that I use to generate the
sample is as followed:
from yade import pack
SoilMat=CohFrictMat(young=1e7,poisson=0.3,density=2650,frictionAngle=0.7,alphaKr=50,alphaKtw=50,momentRotationLaw=True)
O.materials.append((SoilMat))
O.materials.append(CohFrictMat(young=1e7,poisson=0.5,frictionAngle=0,density=0,label='walls',momentRotationLaw=True))
O.bodies.append(geom.facetBox((0,0,0.8),(.25,.25,0.8),wallMask=31,material='walls'))
sp=pack.SpherePack()
sp.makeCloud((-.25,-.25,0),(.25,.25,1.6),rMean=.0175,rRelFuzz=.3)
sp.toSimulation(material=SoilMat)
#Engine of the simulation
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Box_Aabb(),Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Box_Sphere_ScGeom6D(),Ig2_Facet_Sphere_ScGeom6D()],
[Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()],
[Law2_ScGeom6D_CohFrictPhys_CohesionMoment()]
),
#introduced as a dead engine for the moment
NewtonIntegrator(gravity=(0,0,-9.81)),
#Run the specific controlled motion.
PyRunner(command='start()',realPeriod=1,label='checker'),
]
O.dt=.5*PWaveTimeStep()
def start():
newton.damping=0.3
print('\n# Simulation begins #')
print('Stage: Gravitity desposition.')
print('Time step is %ss.' % O.dt)
checker.command='checkUnbalanced()'
def checkUnbalanced():
print('%s:UnbalancedForce=%s' % (O.iter,unbalancedForce()))
if max([b.state.pos[2]+b.shape.radius for b in O.bodies if
isinstance(b.shape,Sphere)])>0.7: return
if unbalancedForce()>0.01: return
Initial_height=max([b.state.pos[2]+b.shape.radius for b in O.bodies if
isinstance(b.shape,Sphere)])
print('The initial height of the simulation is %s' % Initial_height)
print('Stage: Compression.')
checker.command='Compression()'
def Compression():
O.bodies.append(wall(max([b.state.pos[2]+b.shape.radius for b in
O.bodies if isinstance(b.shape,Sphere)]),axis=2,sense=-1))
global plate
plate=O.bodies[-1]
plate.state.vel=(0,0,-.2)
print('Wall successfully created! Initial veloctity is %s, initial
position is %s.' % (plate.state.vel[2],plate.state.pos[2]))
global Volume
Volume=0
for b in O.bodies:
if isinstance(b.shape,Sphere):
Volume=Volume+b.shape.radius*b.shape.radius*b.shape.radius*4*np.pi/3
print('The volume of the pack is %s' % Volume)
SoilMat.frictionAngle=0
checker.command='Compression_S2()'
def Compression_S2():
void_ratio=plate.state.pos[2]*.5*.5/Volume-1
print('%s: Void ratio=%s' % (O.iter,void_ratio))
if void_ratio>0.6: return
SoilMat.frictionAngle=0.6
plate.state.vel=(0,0,.2)
print('Wait for the particles to settle down after compression.')
checker.command='Density_Checker()'
def Density_Checker():
void_ratio=plate.state.pos[2]*.5*.5/Volume-1
print('%s: Void ratio=%s, Wall Position=%s' %
(O.iter,void_ratio,plate.state.pos[2]))
if abs(O.forces.f(plate.id)[2])>0: return
if unbalancedForce()>0.01: return
print(max([b.state.pos[2]+b.shape.radius for b in O.bodies if
isinstance(b.shape,Sphere)]))
checker.command='Record()'
def Record():
print('The sample is generated successfully!')
O.pause()
I think the way I generate the sample is not stable. And also, to spend
less time, the material is different between when I generate the sample
and when I do the seepage test.
I'm now trying to
Re: [Yade-users] [Question #692704]: Using flow engine got the wrong pressure field
Question #692704 on Yade changed: https://answers.launchpad.net/yade/+question/692704 Huang peilun posted a new comment: Also, in order to get a stable pressure field, reducing the fluid viscosity helps a lot. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #692704]: Using flow engine got the wrong pressure field
Question #692704 on Yade changed: https://answers.launchpad.net/yade/+question/692704 Huang peilun posted a new comment: Thanks, Robert. I've rewrite my script. The particles generated by my old script appears to get a 'high' velocity in the first few iterations. And the particle velocity affects the change of pressure field. Therefore, I think careful creation of the specimen has certain effect on the change of pressure field. But the effect is little and it's not the key point. What I said not long ago was wrong. Now I think the key point of the reason why the pressure field changes rapidly is the high value of the fluid viscosity. I change the viscosity from 10 to 0.00298 and found out that difference is obvious. The pressure field doesn't change that much. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #692704]: Using flow engine got the wrong pressure field
Question #692704 on Yade changed: https://answers.launchpad.net/yade/+question/692704 Huang peilun posted a new comment: >If this is true, then you just need to ensure that your unbalanced force is lower. This has nothing to do with flow engine. Yes, I agree with you. >It changes rapidly or is doesnt change that much? I found out that: If the viscosity is high, the pressure field will change dramatically due to the external disturbance. Like my case, my unbalanced force is not low enough, so the first iteration gives pressure varies from 0-100 while the pressure of some pore is about -1 in the second. If the viscosity is low, the pressure field won't change much between the the first iteration and the second iteration. I think it's because I increase the value of the elements in the conductivity matrix G, therefore influence of the velocity of the particles is reduced. GP=Ev+Qq+Qp >changing viscosity is the same as changing permeability in the code Thanks for the information. I didn't know this before. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #693370]: Problems about the flow.multithread
Question #693370 on Yade changed: https://answers.launchpad.net/yade/+question/693370 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Robert Caulk, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #693370]: Problems about the flow.multithread
New question #693370 on Yade:
https://answers.launchpad.net/yade/+question/693370
I've been using the "flow.multithread" to accelerate the calculation speed of
problems about saturated soil recently. I've encounter several problems about
the "flow.multithread".
1. When I write "multithread=True" before the simulation begins, just like the
following, it reports that Segmentation fault (core dumped).
O.engines=[
...
FlowEngine(multithread=1, dead=0, label="flow", ompThreads=10),
...
]
However, if I don't set multithread=True at the first time I define the flow
engine, set flow.multithread=True after running several steps instead, it works
and the calculation is accelerated. I have no idea why this happens.
2. When I set flow.multithread=True after running several steps, although it
works, there appears to be a period error. After certain steps, all pore
pressure turn to zero and the next step everything is back to normal again.
This error occurs at a fixed interval.
I'm using the
Linux version 5.4.0-47-generic (buildd@lgw01-amd64-038) (gcc version 7.5.0
(Ubuntu 7.5.0-3ubuntu1~18.04))
Yade 20201007-4243~57d1c9c~bionic1
Here's a MWE to produce the error. Through the VTK file can get the period
error.
##
from yade import pack,export
SoilMat=CohFrictMat(young=20e9,poisson=0.3,density=2650,frictionAngle=0.7,alphaKr=50,alphaKtw=50,momentRotationLaw=True,label='soil')
O.materials.append((SoilMat))
mn,mx=Vector3(-.25,-.25,0),Vector3(.25,.25,.5)
walls=aabbWalls([mn,mx],thickness=0,material='soil')
wallIds=O.bodies.append(walls)
snum=1000
sp=pack.SpherePack()
sp.makeCloud((-.25,-.25,0),(.25,.25,.5),rMean=.001,rRelFuzz=.3,num=snum)
sp.toSimulation(material=SoilMat)
Target_Stress=-100
triax=TriaxialStressController(
stressMask = 7,
thickness = 0,
internalCompaction=True, # If true the confining pressure is generated
by growing particles
)
Pressure=1
flow=FlowEngine(
dead=1,
defTolerance=0.001,
meshUpdateInterval=200,
useSolver=3,
#multithread=True,
permeabilityFactor=0.001,
bndCondIsPressure=[0,0,0,0,1,1],
bndCondValue=[0,0,0,0,0,Pressure], #The depth of the water is 5.1m
boundaryUseMaxMin=[0,0,0,0,0,0],
viscosity=0.00089 #The dynamic viscosity of water is 8.90*10-4 Pa`s at
about 25 degree.
)
newton=NewtonIntegrator(damping=0.1)
#Engine of the simulation
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Box_Aabb(),Bo1_Sphere_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Box_Sphere_ScGeom6D(),Ig2_Facet_Sphere_ScGeom6D()],
[Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()],
[Law2_ScGeom6D_CohFrictPhys_CohesionMoment()]
),
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
flow,
triax,
PyRunner(command="print('%s: Unbalncedforce %s, Meanstress %s' %
(O.iter,unbalancedForce(),triax.meanStress))",realPeriod=1,label='Monitor'),
newton,
PyRunner(command="flow.saveVtk()",iterPeriod=100,dead=1,label='vtksaver2'),
]
triax.goal1=triax.goal2=triax.goal3=Target_Stress
while 1:
O.run(1000,True)
if unbalancedForce()<0.1 and
abs((Target_Stress-triax.meanStress)/Target_Stress)<0.01:
break
Monitor.dead=1
vtksaver2.dead=0
flow.dead=0
triax.internalCompaction=False
triax.stressMask=0
triax.goal1=triax.goal2=triax.goal3=0
O.run(1,1)
flow.multithread=True
##
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[Yade-users] [Question #692650]: How to use the DFNFlowEngine
New question #692650 on Yade: https://answers.launchpad.net/yade/+question/692650 Hi, I am trying to simulation a standard penetration test on saturated soil. I've been told that the FlowEngine is restricted to quasi-static regimes and may not be suitable for the penetration test. Therefore, I want to use DFNFlowEngine instead. However, I didn't find any instructions about DFNFlowEngine on Yade Documentation and don't have a clue how to use it. I'd be appreciate if somebody could show me some related articles or examples. Thanks in advance. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #693017]: How to accelerate Yade's poromechanical coupling
Question #693017 on Yade changed: https://answers.launchpad.net/yade/+question/693017 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Robert, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #693017]: How to accelerate Yade's poromechanical coupling
Question #693017 on Yade changed: https://answers.launchpad.net/yade/+question/693017 Huang peilun posted a new comment: Thanks Robert, your comments help me a lot. I now understand the matrix factorization reuse, multithreaded factorization and GPU accelerated techniques. I still have some problems about the parallel task management technique. In the python scripts that your mentioned, I think the parallel task management technique is implemented through the following code: ### O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()], [Ip2_FrictMat_FrictMat_FrictPhys()], [Law2_ScGeom_FrictPhys_CundallStrack()],label="iloop" ), FlowEngine(multithread=1,dead=1,label="flow",ompThreads=10), GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8), triax, #VTKRecorder(Key=identifier,dead=1, label='vtkRec', iterPeriod=100,initRun=True,fileName=(outputDir+'/vtkFiles/out-'),recorders=['spheres','facets','boxes']), newton ] #Some of the original code is omitted here if setEnginesParallel: O.engines=[ParallelEngine([flow,[O.engines[0],O.engines[1],O.engines[2],O.engines[4]]]), O.engines[5], O.engines[6] ] triax = O.engines[1] newton = O.engines[2] O.engines[0].slaves[1][0].ompThreads=O.engines[0].slaves[1][1].ompThreads=O.engines[0].slaves[1][2].ompThreads=O.engines[0].slaves[1][3].ompThreads=5 flow.ompThreads=4 ### I think based on the above code, FlowEngine runs before the ForceResetter() which is now the O.engines[0].slaves[1][0]. However, in this case, the fluid force cannot be applied to the sphere particles. Did I get this right? Besides, I noticed that the parallelism in Yade has 3 levels. According to my understanding, by using the -j/--thread option, one can implement parallelism inside Engines and parallelism between Computation, interaction (python, GUI) and rendering. Parallelism inside multiple engine groups can only be implemented by ParallelEngine. Did I get it right？ I'm not sure if I should open a new question. Thanks Peilun -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #693017]: How to accelerate Yade's poromechanical coupling
New question #693017 on Yade: https://answers.launchpad.net/yade/+question/693017 Hi, I learned from this paper [1] that Yade's poromechanically coupled DEM+PFV scheme can be accelerated by 170x by combining four techniques: matrix factor reuse, multithreaded factorization, GPU accelerated factorization, and parallel task management. I'm wondering that are these four technologies, especially the matrix factor reuse technique, currently being implemented in YADE? How can I apply these four techniques to the coupling problem in practice? Thanks Peilun [1]Caulk R A, Catalano E, Chareyre B. Accelerating yade’s poromechanical coupling with matrix factorization reuse, parallel task management, and gpu computing[J]. Computer Physics Communications, 2020, 248: 106991. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #693803]: How to model seismic wave propagation
New question #693803 on Yade: https://answers.launchpad.net/yade/+question/693803 Hi, I want to model seismic wave propagation in granular soil. However, I didn't find many examples. I find the method in [1] interesting, but I don't know how to apply this method in Yade. In [1], soil response to sinusoidal motions in a dry granular soil column is investigated. The concept of viscous boundary developed by Lysmer et al. [2] and White et al. [3] is implemented at the base. This kind of dynamic boundary utilize dashpots attached independently to the boundary for two functions: (1) applying the base input motion to the soil deposit, and (2) absorbing all or part of elastic energy of the shear wave approaching the boundary. To have an absorbing boundary at the base, a frictionless wall was placed to the base of the deposit. The upper boundary is free. Periodic boundaries were employed to simulate a semi-infinite system in the two lateral directions of shaking. At each time step, particles in contact with the base wall were identified. External force promotion to the velocity of each particle in the direction of shaking was applied at the center of the particle in order to simulate the input seismic wave. My questions are as followed: 1. In Yade, I find that the periodic boundary must contain all the six faces, including the lateral boundary, the base and the top. (Am I right?) How can I make the base to be a frictionless wall and the upper boundary to be free? 2. Is there a better way to simulate seismic wave propagation in granular soil? How to deal with the dynamic boundary setting and the input of seismic waves? Thanks! [1]Zamani N, El Shamy U. Analysis of wave propagation in dry granular soils using DEM simulations[J]. Acta Geotechnica, 2011, 6(3): 167. [2]Lysmer J, Roger L, Kuhlemeyer A (1969) Finite dynamic model for infinite media. J Eng Mech Div 95:858–877 [3]White W, Villiappan S, Lee IK (1977) Unified boundary for finite dynamic models. J Eng Mech Div 103(5):949–964 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #693803]: How to model seismic wave propagation
Question #693803 on Yade changed: https://answers.launchpad.net/yade/+question/693803 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Jan Stránský, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #693831]: How to deal with the dynamic boundary setting and the input of seismic waves in YADE
New question #693831 on Yade: https://answers.launchpad.net/yade/+question/693831 Hi, I want to model seismic wave propagation in granular soil. Unlike static analysis, fixed boundaries reflect outward propagating waves back into the model and trap energy of the outward traveling waves which may lead to great inaccuracies. Instead, nonreflecting boundaries that allow the necessary energy radiation is a better option. I want to have a comprehensive view of how to set up the dynamic boundary and input seismic waves in terms of the discrete element method. Through other's work, I could learn how they solved these problems, but I didn't find a literature review about this problem. I would like to know which method is the most appropriate one and how to apply this method in YADE. Can someone give me some guidance? Thanks! -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #696228]: How to get a pressure boundary condition as triangle distribution by FlowEngine
New question #696228 on Yade: https://answers.launchpad.net/yade/+question/696228 Hello all, As we know, water pressure increases with depth. (Pressure=denstiy*g*depth) I want to use FlowEngine to get a pressure boundary that the pressure is increasing with depth. However, I find that by setting "bndCondValue"[1] can only get a uniform pressure at the boundary, which doesn't change with depth. I've read through the FlowEngine class reference [2] to get some ideas. I think I can search for the cells which are outermost and use "setCellPressure" [3] to get a boundary that the pressure increases with depth. But this is too complicated. Is there any better idea? Thank you for any suggestions. [1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.FlowEngine.bndCondValue [2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.FlowEngine [3] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.FlowEngine.setCellPressure -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #696228]: How to get a pressure boundary condition as triangle distribution by FlowEngine
Question #696228 on Yade changed: https://answers.launchpad.net/yade/+question/696228 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Robert Caulk, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #695934]: Compression won't stop when the goal of TriaxialStressController is reached
Question #695934 on Yade changed: https://answers.launchpad.net/yade/+question/695934 Huang peilun posted a new comment: Thanks Jan Stránský, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #695934]: Compression won't stop when the goal of TriaxialStressController is reached
Question #695934 on Yade changed: https://answers.launchpad.net/yade/+question/695934 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Robert Caulk, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #696055]: O.load: Input stream error
Question #696055 on Yade changed: https://answers.launchpad.net/yade/+question/696055 Huang peilun posted a new comment: Thanks a lot. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #696056]: Can't clump facet together
Question #696056 on Yade changed: https://answers.launchpad.net/yade/+question/696056 Huang peilun posted a new comment: > for discussion continuation, why not providing more info already this time? :-) Really sorry about that. > what is "a boudary"? I want to simulate the sampler of the standard penetration test. The shape of the driving shoe is not of regular shape, therefore can not be represented by box object or cylinder. It's like a tube and with a contraction at the top. I was told that the shape of the driving shoe do have effect on the result of the SPT but I am not sure how large the impact is. So I want to simulate the exact shape. I tried polyhedron but in that case I can't use CohFrictMat. Because Ig2 for sphere and polyhedra only support ScGeom and CohFrictPhys need ScGeom6D. If I don't use CohFrictPhys, the macroscopic friction angle is too small and not like the real soil. > Why are (fixed, not moving) individual facets not suitable and why you need a clump? I clump the facets together so that I can simulate the exact shape. In my understanding, individual facets are of triangle shape and can not move together. In my case I need the boundary of the sampler to move together. Thus I have to clump them together. >Using facets for this purpose is fine [2,3,4,5], but normally you do not need at all to clump the facets [2,3,4,5]. Thanks for your advice. I am going to study these code to see if they can help. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #696056]: Can't clump facet together
Question #696056 on Yade changed: https://answers.launchpad.net/yade/+question/696056 Huang peilun posted a new comment: Yes, I need a clump for the boundary. I want to create a boundary that is not cuboid, like a polyhedron. But I'm not proficient in using Yade. The only thought that came up to me is using facets and put them together. Can you give me some advice? -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #696055]: O.load: Input stream error
Question #696055 on Yade changed: https://answers.launchpad.net/yade/+question/696055 Huang peilun posted a new comment: Thanks. Now I understand. I saved the files with the old version. But in this case if I want to repeat the simulation or try some other conditions, I should not update Yade often? -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #696055]: O.load: Input stream error
Question #696055 on Yade changed: https://answers.launchpad.net/yade/+question/696055 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Jan Stránský, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #696055]: O.load: Input stream error
New question #696055 on Yade:
https://answers.launchpad.net/yade/+question/696055
Hi,
I just update the yadedaily. It's now Yade 20210313-5135~5285d37~bionic1.
Before I update, O.load works fine. Now it reports this error:
---
RuntimeError Traceback (most recent call last)
/usr/bin/yadedaily in ()
> 1 O.load('Triax_PSD1.xml.bz2')
RuntimeError: input stream error
I don't know why this happen. Can someone help me out?
Thanks.
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[Yade-users] [Question #696056]: Can't clump facet together
New question #696056 on Yade: https://answers.launchpad.net/yade/+question/696056 Hi, I'm trying to clump facet together to create a boundary that is not cuboid. My code is as followed: f1=facet(vertices=[(0,0,0),(0,1,0),(1,0,0)],wire=False) f2=facet(vertices=[(1,1,0),(0,1,0),(1,0,0)],wire=False) O.bodies.appendClumped((f1,f2)) But it reports error like this: python3.6: /builds/yade-dev/trunk/deb/yadedaily/core/Clump.cpp:242: static void yade::Clump::updateProperties(const boost::shared_ptr&, unsigned int): Assertion `M > 0' failed. Aborted (core dumped) Can someone help me? Thanks. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #696056]: Can't clump facet together
Question #696056 on Yade changed: https://answers.launchpad.net/yade/+question/696056 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Jan Stránský, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #696056]: Can't clump facet together
Question #696056 on Yade changed: https://answers.launchpad.net/yade/+question/696056 Huang peilun posted a new comment: Thanks, I'll pay attention to provide more information next time. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #696056]: Can't clump facet together
Question #696056 on Yade changed: https://answers.launchpad.net/yade/+question/696056 Huang peilun posted a new comment: Thanks, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #695934]: Compression won't stop when the goal of TriaxialStressController is reached
Question #695934 on Yade changed: https://answers.launchpad.net/yade/+question/695934 Huang peilun posted a new comment: Thanks Robert, but is the assigned strain rate the rate of the true (logarithmic) strain? -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #695934]: Compression won't stop when the goal of TriaxialStressController is reached
New question #695934 on Yade:
https://answers.launchpad.net/yade/+question/695934
Hi,
I'm currently doing a simple compression test. I set the stressMask to be 0 and
goal1, goal2, goal3 to be -0.1 in the TriaxialStressController. However, when
the strain reaches -0.1, the compression does not stop. I continue the
simulation and the strain reaches -0.7 with no tendency to stop. I'm confused
why this happens. Can anyone help me out?
Here's my code:
from yade import pack
SoilMat=CohFrictMat(young=2e9,poisson=0.3,density=2650,frictionAngle=0.7,alphaKr=50,alphaKtw=50,momentRotationLaw=True)
WallMat=CohFrictMat(young=2e20,poisson=0.5,frictionAngle=0.7,density=1000,label='walls',momentRotationLaw=True)
O.materials.append((SoilMat,WallMat))
mn,mx=Vector3(0,0,0),Vector3(100,100,100)
walls=aabbWalls([mn,mx],thickness=0,material='walls')
wallIds=O.bodies.append(walls)
Particle_num=8000
sp=pack.SpherePack()
sp.makeCloud((0,0,0),(100,100,100),rMean=.5,num=Particle_num)
sp.toSimulation(material=SoilMat)
triax=TriaxialStressController(
stressMask = 7,
thickness = 0,
max_vel=0.05,
internalCompaction=True, # If true the confining pressure is generated
by growing particles
wall_bottom_activated=False,
wall_back_activated=False,
wall_left_activated=False,
goal1 = -3, goal2 = -3, goal3 = -3,
)
newton=NewtonIntegrator(damping=0.2)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Box_Aabb(),Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Box_Sphere_ScGeom6D(),Ig2_Facet_Sphere_ScGeom6D()],
[Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()],
[Law2_ScGeom6D_CohFrictPhys_CohesionMoment()]
),
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
triax,
newton,
PyRunner(command='Step1()',realPeriod=1,label='SLM'),
]
def Step1():
print(abs((3+triax.meanStress)/3))
if abs((3+triax.meanStress)/3)<0.05:
triax.stressMask=0
triax.internalCompaction=False
triax.goal1=triax.goal2=triax.goal3=-0.1
SLM.command='Step2()'
def Step2():
print("%s: %s, %s" % (O.iter,triax.depth,triax.strain))
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Re: [Yade-users] [Question #700748]: how to calculate the plastic part of shear displacement in law2-cohesionMoment
Question #700748 on Yade changed: https://answers.launchpad.net/yade/+question/700748 Status: Answered => Solved Huang peilun confirmed that the question is solved: Thanks Bruno Chareyre, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #700748]: how to calculate the plastic part of shear displacement in law2-cohesionMoment
New question #700748 on Yade:
https://answers.launchpad.net/yade/+question/700748
Hi,
I want to calculate the plastic shear displacement of any specific contact
during every time step. I'm using Law2_ScGeom6D_CohFrictPhys_CohesionMoment[1].
In the source code, the plastic displacement is calculated by the following
code (L140-L159):
Vector3r& shearForce = geom->rotate(phys->shearForce);
const Vector3r& dus= geom->shearIncrement();
//Linear elasticity giving "trial" shear force
shearForce -= phys->ks * dus;
Real Fs= phys->shearForce.norm();
Real maxFs = phys->shearAdhesion;
if (!phys->cohesionDisablesFriction || maxFs == 0) maxFs += Fn
* phys->tangensOfFrictionAngle;
maxFs = math::max((Real)0, maxFs);
if (Fs > maxFs) { //Plasticity condition on shear force
if (phys->fragile && !phys->cohesionBroken) {
phys->SetBreakingState();
maxFs = max((Real)0, Fn *
phys->tangensOfFrictionAngle);
}
maxFs = maxFs / Fs;
Vector3r trialForce = shearForce;
shearForce *= maxFs;
if (scene->trackEnergy || traceEnergy) {
Real sheardissip = ((1 / phys->ks) *
(trialForce - shearForce)) /*plastic disp*/.dot(shearForce) /*active force*/;
Briefly, the plastic shear displacement is calculated by 1/ks*(trialForce -
shearForce). However, it seems trialForce is not available during the
simulation process. Though shearInc is available, which is dus in the source
code, it is not exactly the same as 1/ks*(trialForce - shearForce). Therefore I
want to ask if there is a simple way to get the plastic shear displacement
instead of modify the source code?
Thank you!
[1]
https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/CohesiveFrictionalContactLaw.cpp
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