yade-users team mailing list archive

[Chu <question681486@xxxxxxxxxxxxxxxxxxxxx>]

New question #681486 on Yade:
https://answers.launchpad.net/yade/+question/681486

Hello,

I use FlowEngine to simulate Fluid-Structure Interaction.I generate a dense sample,but I get a very strange pore pressure field.[1]When I set small Viscosity or large CondValue,I get correct pore pressure field.[2]But I must use small CondValue.Could you give me some suggestions?

Thanks for your any suggestion.

[1]https://s2.ax1x.com/2019/06/19/VXZA7F.png
[2]https://s2.ax1x.com/2019/06/19/VXm8Wd.png

#############MWE###################
from yade import pack

psdSizes,psdCumm=[0.000075,0.00015,0.00118,0.00236],[0,0.35,0.35,1.]
num_spheres=50000# number of spheres
young=1e8
compFricDegree = 0 # initial contact friction during the confining phase
finalFricDegree = 30# contact friction during the deviatoric loading
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(compFricDegree),density=2600,label='spheres'))
O.materials.append(FrictMat(young=1e10,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) #"seed" make the "random" generation always the same
sp.toSimulation(material='spheres')

triax=TriaxialStressController(
	thickness = 0,
	stressMask = 7,
	internalCompaction=False, # If true the confining pressure is generated by growing particles
)

newton=NewtonIntegrator(damping=0.2)

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(dead=1,label="flow"),#introduced as a dead engine for the moment
	GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
	triax,
	newton
]

triax.goal1=triax.goal2=triax.goal3=-200000

while 1:
  O.run(1000, True)
  unb=unbalancedForce()
  if unb<0.001 and abs(-200000-triax.meanStress)/200000<0.001:
    break

setContactFriction(radians(finalFricDegree))
newton=NewtonIntegrator(damping=0)

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(dead=1,label="flow"),#introduced as a dead engine for the moment
	GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
	newton
]

flow.dead=0
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=[0,10,0,0,0,0]
flow.boundaryUseMaxMin=[0,0,0,0,0,0]
flow.updateTriangulation=True


-- 
You received this question notification because your team yade-users is
an answer contact for Yade.