Question #685596 on Yade changed:
https://answers.launchpad.net/yade/+question/685596
Justin gave more information on the question:
Klaus,
The error appears to actually be from the grid nodes interacting. I
removed all other variables, and just let gravitational force make two
grid nodes hit, and it causes the "Segmentation fault (core dumped)".
Am I doing something wrong here? Thanks in advance.
Code is below
Thanks,
Justin
from yade.gridpfacet import *
import numpy as np
from yade import utils
from yade import ymport
import sys,time,math,random
from yade import qt
qt.View()
# Spheres information
sphereRadius = .004 # [m]
sphereFalls = 1000
blen = .07*2 ## Length of Ball pit
bhei = .025 ## Height of Ball pit
## Time step set to 20% of Rayleigh Wave
O.dt=.2*utils.RayleighWaveTimeStep() # 0.0011302534626965682
O.dt=0.00000011302534626965682/2
O.engines=[
###Reset all forces stored in Scene::forces (O.forces in
python). Typically, this is the first engine to be run at every step.
In addition, reset those energies that should be reset, if energy tracing is
enabled.
## Resets forces and moments that act on bodies
ForceResetter(),
## Using bounding boxes find possible body collisions.
InsertionSortCollider([
Bo1_Facet_Aabb(),
Bo1_Sphere_Aabb(),
Bo1_GridConnection_Aabb(),
Bo1_PFacet_Aabb(),
]),
InteractionLoop([
Ig2_Facet_Sphere_ScGeom(),
Ig2_Wall_PFacet_ScGeom(),
Ig2_Wall_Sphere_ScGeom(),
Ig2_Sphere_Sphere_ScGeom(),
Ig2_Sphere_GridConnection_ScGridCoGeom(),
Ig2_Sphere_PFacet_ScGridCoGeom(),
Ig2_GridNode_GridNode_GridNodeGeom6D(),
Ig2_GridConnection_GridConnection_GridCoGridCoGeom(),
Ig2_GridConnection_PFacet_ScGeom(),
Ig2_PFacet_PFacet_ScGeom(),
],
[
Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=True,setCohesionOnNewContacts=True),
# internal cylinder physics
Ip2_FrictMat_FrictMat_FrictPhys() # physics for
external interactions, i.e., cylinder-cylinder, sphere-sphere, cylinder-sphere
],
[
Law2_ScGeom_FrictPhys_CundallStrack(), #
contact law for sphere-sphere
Law2_ScGridCoGeom_FrictPhys_CundallStrack(), #
contact law for cylinder-sphere
Law2_ScGeom6D_CohFrictPhys_CohesionMoment(), #
contact law for "internal" cylinder forces
Law2_GridCoGridCoGeom_FrictPhys_CundallStrack(), #
contact law for cylinder-cylinder interaction
]),
NewtonIntegrator(damping=.2,gravity=[0,10,-9.81], label='newtonInt'),
PyRunner(command='turnongrass()',firstIterRun=sphereFalls, nDo=6,
dead=False, label='freeGrass'),
]
## Grass Information
O.materials.append(CohFrictMat(young=100,poisson=0.3,density=40,frictionAngle=np.radians(30),normalCohesion=1e5,shearCohesion=1e5,momentRotationLaw=True,label='grass'))
rCyl = 0.0026 ## Grass was about 1.2 [mm] wide
nL = 3 ## No exact Number here, just trial and error
L = bhei ## Height of spheres
### Grass Creation
### Create all nodes first :
nodesIds=[]
idxc = -1
x_gap = 0.009 ## Between lumps is roughly 9 [mm]
y_gap = 0.01905 ## Between lines of backing is .75 inch apart
range_x = 1
range_y = 2
cen_y = -(range_y/2)*y_gap ## Allows the "box" of grass to be center in Z
for ii in range(0,range_y):
cen_x = -(range_x/2)*x_gap # Allows the "box" of grass to be center in X
for jj in range(0,range_x):
for z in np.linspace(0,L,nL):
nodesIds.append(O.bodies.append(gridNode([cen_x,cen_y,z+sphereRadius],rCyl,wire=False,fixed=False,material='grass')))
idxc += 1
d = idxc*nL ## Start of grass fiber
cen_x += x_gap
#### Now create connection between the nodes
for k,j in zip(nodesIds[d:d+nL-1],nodesIds[d+1:nodesIds[-1]+1]):
O.bodies.append(gridConnection(k,j,rCyl))
cen_y += y_gap
for kk in range(0,len(nodesIds)): ## First Blocking all DOF's until balls
fall around.
O.bodies[nodesIds[kk]].state.blockedDOFs='xyzXYZ'
def turnongrass():
print("Turning on Grass")
for kk in range(0,len(nodesIds)):
O.bodies[nodesIds[kk]].state.blockedDOFs='' ## Unblocking
all DOF's
for kk in range(0,len(nodesIds),nL):
O.bodies[nodesIds[kk]].state.blockedDOFs='xyzXYZ' ## Blocking
DOF's for Bottom nodes
O.bodies[nodesIds[kk+nL-1]].state.blockedDOFs='' ## Top of
Grass
freeGrass.dead = True
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