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[Chu <question682194@xxxxxxxxxxxxxxxxxxxxx>]

New question #682194 on Yade:
https://answers.launchpad.net/yade/+question/682194

Hi,

I'd like to test flow.mask[1] to assign bodies affected by FlowEngine.But when I open the Vtk saved by flow.saveVtk(),Paraview crashed.It is not always occur,but in my script it does.In the MWE,if I use psd1,Paraview crashed.And it not occur with psd2.

Thanks for any suggestions.

###########MWE#############

from yade import pack

psdSizes,psdCumm=[0.0005,0.0006,0.005,0.007],[0,0.35,0.35,1.] #psd1
#psdSizes,psdCumm=[0.0005,0.0006],[0,1.] #psd2
num_spheres=1000# number of spheres
young=1e9
mn,mx=Vector3(0,0,0),Vector3(0.01,0.01,0.01) # corners of the initial packing

O.materials.append(FrictMat(young=young,poisson=0.2,frictionAngle=radians(0),density=2600,label='spheres'))
O.materials.append(FrictMat(young=1e11,poisson=0.2,frictionAngle=0,density=0,label='walls'))
walls=aabbWalls([mn,mx],thickness=0,material='walls')
wallIds=O.bodies.append(walls)

sp=pack.SpherePack()
sp.makeCloud(mn,mx,psdSizes=psdSizes,psdCumm=psdCumm,distributeMass=True,num=num_spheres,seed=1)
sp.toSimulation(material='spheres')

newton=NewtonIntegrator(damping=0.2,label="newton")

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(label="flow"),
	GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
    PyRunner(iterPeriod=2000,command='test_mask()',label='detach'),
    PyRunner(iterPeriod=2000,command='flow.saveVtk()',label='savevtk'),
	newton
]

flow.dead=0
flow.mask=1
flow.defTolerance=0.3
flow.meshUpdateInterval=200
flow.useSolver=3
flow.permeabilityFactor=1
flow.viscosity=0.001
flow.bndCondIsPressure=[1,1,0,0,0,0]
flow.bndCondValue=[0,50,0,0,0,0]
#flow.boundaryUseMaxMin=[0,0,0,0,0,0]
flow.updateTriangulation=True
O.dt=1e-8
O.dynDt=False

def test_mask():
    for i in O.bodies:
        if isinstance(i.shape,Sphere):
            if i.state.pos[0] < 0.003:
                i.mask = 2

#############################

[1]https://yade-dev.gitlab.io/trunk/yade.wrapper.html?highlight=#yade.wrapper.FlowEngine.mask

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