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[Pengfei Tan <question689446@xxxxxxxxxxxxxxxxxxxxx>]

New question #689446 on Yade:
https://answers.launchpad.net/yade/+question/689446

Dear all,

I would like to simulate the spreading process of spherical powders by a roller under the periodic boundary condition. The roller is represented by a cylindrical particle. Since the radius and length of the cylindrical roller  is much larger than the cell of the periodic size. The simulation always encountered the error "Segmentation fault (core dumped)". Please give some suggestions about how to add this large cylinder into the periodic cell. 

Sincerely appreciate your help.

Best regards,
Pengfei


Please see script as follows:

######################################################################
from yade.gridpfacet import *
from yade import pack, plot,qt,export

#Size of periodic cell
Ls=50.
Ws=8.
Hs=20.

rc=10.  #Radius of cylindrical roller

#### Periodic boundary conditions ###
O.periodic = True
O.cell.setBox(Ls,Ws,Hs)

#### Engines ####
O.engines=[
	ForceResetter(),
	InsertionSortCollider([
		Bo1_GridConnection_Aabb(),
		Bo1_Box_Aabb(),
		Bo1_Sphere_Aabb(),
	],allowBiggerThanPeriod = True),
	InteractionLoop([
		Ig2_GridNode_GridNode_GridNodeGeom6D(),
		Ig2_Sphere_Sphere_ScGeom(),
		Ig2_Box_Sphere_ScGeom(),
		Ig2_Sphere_GridConnection_ScGridCoGeom(),
		Ig2_GridConnection_GridConnection_GridCoGridCoGeom(),

	],
	[
		Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=True,setCohesionOnNewContacts=False),
		Ip2_FrictMat_FrictMat_FrictPhys()
	],
	[
		Law2_ScGeom_FrictPhys_CundallStrack(),         
		Law2_ScGeom6D_CohFrictPhys_CohesionMoment(),	
		Law2_ScGridCoGeom_FrictPhys_CundallStrack(),	
		Law2_GridCoGridCoGeom_FrictPhys_CundallStrack()
	]
	),
	GlobalStiffnessTimeStepper(timestepSafetyCoefficient=0.1,label='ts'), 
	NewtonIntegrator(gravity=(0.,0,-10),damping=0.5,label='newton'),
	PyRunner(command='addMovement()',iterPeriod=1),

]
O.dt=0.1*PWaveTimeStep()

#### Create materials ####
O.materials.append( CohFrictMat( young=1e9,poisson=0.3,density=1000,frictionAngle=radians(30.),normalCohesion=1e500,shearCohesion=1e500,momentRotationLaw=True,label='cMat' ) )
O.materials.append( FrictMat( young=1e9,poisson=0.3,density=1000,frictionAngle=radians(30.),label='fMat' ) )
O.materials.append(FrictMat(young=1e9,poisson=0.3,frictionAngle=radians(30.),density=1600,label='spheremat'))

### Cylindrical roller ###
#cylinder((12.,0.,rc+1.5),(12.,Ws,rc+1.5),radius=rc,nodesIds=nodesIds,cylIds=cylIds,color=[1,0,0],fixed=False,intMaterial='cMat',extMaterial='fMat')
nodesIds=[]
cylIds=[]
cylinderConnection([[12.,0,rc+1.5],[12.,0.33*Ws,rc+1.5],[12.,0.33*2*Ws,rc+1.5],[12.,Ws,rc+1.5]],radius=rc,fixed = True,nodesIds=nodesIds,cylIds=cylIds,color=[1,0,0],intMaterial='cMat',extMaterial='fMat')
O.engines=O.engines+[ TranslationEngine(translationAxis=[1,0,0],ids=nodesIds+cylIds,label="transEngine")+RotationEngine(rotationAxis=(0,1,0),ids=nodesIds+cylIds,label="rotEngine") ]

### Box as substrate ###
O.bodies.append(box(center= (0,0,0.2),extents=(60.,60.,0),fixed=True,color = (128.,128.,128.),wire = False,material = 'fMat'))

#### Spheres ####
sp=pack.SpherePack()
Ns=sp.makeCloud(Vector3(25.,0.,1.),Vector3(30.,Ws,6.),0.3,0.2,50,False,0.8)
sphereID=sp.toSimulation(material='spheremat')

def addMovement():
	transEngine.velocity=1.
	rotEngine.angularVelocity=-1./5.

qt.View()
O.saveTmp()

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