New question #692617 on Yade:
https://answers.launchpad.net/yade/+question/692617
I'm trying to simulate cohesion of spheres to cylinder in flow around this
cylinder
My scriptYade.py:
############
from __future__ import print_function
import sys
from yadeimport import *
from yade.wrapper import *
from yade.utils import *
initMPI() #Initialize the mpi environment, always
required.
fluidCoupling = yade.FoamCoupling(); #Initialize the engine
fluidCoupling.getRank(); #part of Initialization.
#example of spheres in shear flow : two-way point force coupling
class simulation():
def __init__(self):
O.periodic = True
O.cell.setBox(1,0.4,0.2)
numspheres=1000
young = 5e6
density = 2000
mat1 = CohFrictMat(normalCohesion=1e7, shearCohesion=1e7,
young=young, poisson=0.5, frictionAngle=radians(15), density=density,
label='spheremat')
O.materials.append(mat1)
mat2 = CohFrictMat(normalCohesion=1e7, shearCohesion=1e7,
young=young, poisson=0.5, frictionAngle=radians(15), density=density,
label='wallmat')
O.materials.append(mat2)
epsilon = 1e-08
minval = 0 + epsilon
maxx = 1.0 - epsilon
maxy = 0.4 - epsilon
maxz = 0.2 - epsilon
#wall coords, use facets for wall BC:
v0 = Vector3(minval, minval, minval)
v1 = Vector3(minval,minval,maxz)
v2 = Vector3(maxx,minval,minval)
v3 = Vector3(maxx,minval,maxz)
v4 = Vector3(minval,maxy,minval)
v5 = Vector3(minval,maxy,maxz)
v6 = Vector3(maxx,maxy,minval)
v7 = Vector3(maxx, maxy, maxz)
lf0 = facet(vertices=[v0,v1,v2], material='wallmat')
O.bodies.append(lf0)
lf1 = facet(vertices=[v1,v2,v3], material='wallmat')
O.bodies.append(lf1)
uf0 = facet(vertices=[v4,v5,v6], material='wallmat')
O.bodies.append(uf0)
uf1 = facet(vertices=[v5,v6,v7], material='wallmat')
O.bodies.append(uf1)
ff0 = facet(vertices=[v0,v2,v6], material='wallmat')
O.bodies.append(ff0)
ff1 = facet(vertices=[v0,v6,v4], material='wallmat')
O.bodies.append(ff1)
bf0 = facet(vertices=[v1,v3,v7], material='wallmat')
O.bodies.append(bf0)
bf1 = facet(vertices=[v1,v7,v5], material='wallmat')
O.bodies.append(bf1)
oriBody = Quaternion(Vector3(1,0,0),(0))
O.bodies.append(geom.facetCylinder((0.5,0.2,0.1), radius=0.05,
height=0.2, orientation=oriBody, segmentsNumber=100,
wallMask=4,material='wallmat'))
#spheres
mn, mx= Vector3(minval + epsilon, minval + epsilon, minval +
epsilon), Vector3(0.45, maxy - epsilon, maxz - epsilon)
sp = pack.SpherePack();
sp.makeCloud(mn,mx,rMean=0.001,rRelFuzz=0.1, num=numspheres)
O.bodies.append([sphere(center,rad,material='spheremat') for
center,rad in sp])
sphereIDs = [b.id for b in O.bodies if type(b.shape)==Sphere]
#coupling engine settings
fluidCoupling.setNumParticles(len(sphereIDs))
fluidCoupling.setIdList(sphereIDs)
fluidCoupling.isGaussianInterp=False; #use pimpleFoamYade for
gaussianInterp
# Integrator
newton=NewtonIntegrator(damping=0.0, gravity = (0.0 ,0.0, 0.0))
# add small damping in case of stability issues.. ~ 0.1 max,
also note : If gravity is needed, set it in constant/g dir.
O.timingEnabled==True
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),
Bo1_Facet_Aabb()], allowBiggerThanPeriod=True),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
[Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()],
[
Law2_ScGridCoGeom_CohFrictPhys_CundallStrack(),
Law2_CylScGeom6D_CohFrictPhys_CohesionMoment(),
Law2_ChCylGeom6D_CohFrictPhys_CohesionMoment(),
Law2_ScGeom6D_CohFrictPhys_CohesionMoment(),
Law2_ScGeom6D_InelastCohFrictPhys_CohesionMoment()
]
),
GlobalStiffnessTimeStepper(timestepSafetyCoefficient=0.5, label = "ts"),
fluidCoupling, #to be called after timestepper
PyRunner(command='sim.printMessage()', iterPeriod= 1,
label='outputMessage'),
newton,
VTKRecorder(fileName='yadep/3d-vtk-',recorders=['spheres', 'facets', 'intr',
'force'],virtPeriod=0.01)
]
def printMessage(self):
print("********************************YADE-ITER = " +
str(O.iter) +" **********************************")
print("********************************YADE-TIME = " +
str(O.time) +" **********************************")
def printDt(self):
print(O.dt)
def setDt(self, dt):
O.dt = dt
def irun(self,num):
O.run(num,1)
if __name__=="__main__":
sim = simulation()
sim.irun(1000000)
fluidCoupling.killMPI()
import builtins
builtins.sim=sim
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