New question #683821 on Yade:
https://answers.launchpad.net/yade/+question/683821
Hi,
I'm trying to generate a cylinder sample with target porosity, the MWE comes
from [1]. The main changes are:
1. changed the sphere material from FrictMat to CohFrictMat, as well as
corresponding engines,
2. cut the cubic sample to fulfil a cylinder shape after target porosity is
reached.
The problem is after the simulation finished (run about 30 seconds), I can not
find any particles in the scene, while I use 'len(O.bodies)' to check, I can
get that there are 870 bodies. Here is the MWE:
########
from yade import pack
num_spheres=1000
key='_triax_base_'
targetPorosity = 0.43
compFricDegree = 30
finalFricDegree = 30
rate=-0.02
damp=0.2
stabilityThreshold=0.01
young=5e6
mn,mx=Vector3(0,0,0),Vector3(0.07,0.07,0.14)
cement =
CohFrictMat(young=30e9,poisson=0.3,frictionAngle=radians(30),density=2650.0,isCohesive=True,normalCohesion=1e8,
shearCohesion=1e8,label='cement')
walls =
FrictMat(young=young,poisson=0.5,frictionAngle=0,density=0,label='walls')
O.materials.append(cement)
O.materials.append(walls)
walls=aabbWalls([mn,mx],thickness=0,material='walls')
wallIds=O.bodies.append(walls)
sp=pack.SpherePack()
x=[5.0,6.0005088055510125,6.807147320174279,7.200507128170075,7.399996645238125,7.604595185078019,7.809172757656196,8.008676252898724,8.20306373628217,8.41275033163219,9.005096442414814]
y=[0,9.972588799847912,20.08747541588565,29.9397121334748,39.93424666725376,50.065627529175956,59.78605006143409,70.0545568149891,80.04923113051282,89.9064999909142,100.0]
#### change the size units
psdSizes=x
for i in range(0,len(x)):
psdSizes[i]=x[i]*0.001
## change the unit to percentage
psdCumm=y
for i in range(0,len(y)):
psdCumm[i]=y[i]*0.01
sp.makeCloud(mn,mx,psdSizes=psdSizes,psdCumm=psdCumm,distributeMass=True,seed=1)
sp.toSimulation(material='cement')
Gl1_Sphere.quality=3
triax=TriaxialStressController(
maxMultiplier=1.+2e4/young,
finalMaxMultiplier=1.+2e3/young,
thickness = 0,
stressMask = 7,
internalCompaction=False,
)
newton=NewtonIntegrator(damping=damp)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Box_Sphere_ScGeom()],
[Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(),Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom6D_CohFrictPhys_CohesionMoment(),Law2_ScGeom_FrictPhys_CundallStrack()]
),
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
triax,
TriaxialStateRecorder(iterPeriod=100,file='WallStresses'+key),
newton
]
triax.goal1=triax.goal2=triax.goal3=-10000
while 1:
O.run(1000, True)
unb=unbalancedForce()
print 'unbalanced force:',unb,' mean stress: ',triax.meanStress
if unb<stabilityThreshold and abs(-10000-triax.meanStress)/10000<0.001:
break
print "### Isotropic state saved ###"
import sys
while triax.porosity>targetPorosity:
compFricDegree = 0.95*compFricDegree
setContactFriction(radians(compFricDegree))
print "\r compFrictionDegree: ",compFricDegree,"
porosity:",triax.porosity,
sys.stdout.flush()
O.run(500,1)
print "### Compacted state saved ###"
aabb=utils.aabbExtrema()
predX=(aabb[0][0]+aabb[1][0])/2
predY=(aabb[0][1]+aabb[1][1])/2
predR=min((aabb[1][0]-aabb[0][0])/2,(aabb[1][1]-aabb[0][1])/2)
pred=pack.inCylinder((predX,predY,0),(predX,predY,0.14),predR)
## erase Walls and spheres which is not in cylinder
def cylinderShape():
for i in O.bodies:
if not isinstance(i.shape,Sphere):
O.bodies.erase(i.id)
if isinstance(i.shape,Sphere):
if not pred(i.state.pos, i.shape.radius): # if
sphere with c,r is in pred(cylinder), then add this sphere into bodies.
O.bodies.erase(i.id)
cylinderShape()
########
Could you please help me with this problem?
Thanks,
Leonard
[1]https://github.com/yade/trunk/blob/master/examples/triax-tutorial/script-session1.py
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