New question #683687 on Yade:
https://answers.launchpad.net/yade/+question/683687
Hey Yade community,
I am unable to save and reload a FlowEngine based scene. I reproduce the error
here using the save-then-reload.py [1] as an example for modifying oedometer.py
[2].
___The error is as follows:___
>>
GS : j=0 p_moy=-nan dp_moy=-nan
GS iterations : 0
totalForce = 0 0 0
>>
This error suggests that the scene is improperly loaded, considering these GS
errors are associated with flow.useSolver=0 [3] (meanwhile the script defines
flow.useSolver=3). Further, I've tried re-defining all the flow properties,
such as flow.useSolver=3, again after O.load() and before O.run(), but the
error does not change. My first thought is that FlowBoundingSphere/Linsolv is
not serializable, and therefore we lose all information from the solver class
during save/reload. Any ideas?
____The MWE is as follows:____
from __future__ import print_function
from builtins import range
from yade import pack
num_spheres=1000# number of spheres
young=1e6
compFricDegree = 3 # initial contact friction during the confining phase
finalFricDegree = 30 # contact friction during the deviatoric loading
mn,mx=Vector3(0,0,0),Vector3(1,1,1) # corners of the initial packing
O.materials.append(FrictMat(young=young,poisson=0.5,frictionAngle=radians(compFricDegree),density=2600,label='spheres'))
O.materials.append(FrictMat(young=young,poisson=0.5,frictionAngle=0,density=0,label='walls'))
walls=aabbWalls([mn,mx],thickness=0,material='walls')
wallIds=O.bodies.append(walls)
import os.path
savedState = os.path.exists('oedometer_state.yade.gz')
if not savedState:
sp=pack.SpherePack()
sp.makeCloud(mn,mx,-1,0.3333,num_spheres,False, 0.95,seed=1) #"seed"
make the "random" generation always the same
sp.toSimulation(material='spheres')
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"),
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
TriaxialStressController(maxMultiplier=1.+2e4/young,
finalMaxMultiplier=1.+2e3/young, thickness = 0,stressMask = 7,max_vel =
0.005,internalCompaction=True,label='triax'),
NewtonIntegrator(damping=0.2,label='newton')
]
triax.goal1=triax.goal2=triax.goal3=-10000
if not savedState:
while 1:
O.run(1000, True)
unb=unbalancedForce()
if unb<0.001 and abs(-10000-triax.meanStress)/10000<0.001:
break
setContactFriction(radians(finalFricDegree))
#B. Activate flow engine and set boundary conditions in order to get
permeability
flow.dead=0
flow.defTolerance=0.3
flow.meshUpdateInterval=200
flow.useSolver=3
flow.permeabilityFactor=1
flow.viscosity=10
flow.bndCondIsPressure=[0,0,1,1,0,0]
flow.bndCondValue=[0,0,1,0,0,0]
flow.boundaryUseMaxMin=[0,0,0,0,0,0]
O.dt=0.1e-3
O.dynDt=False
O.run(1,1)
Qin = flow.getBoundaryFlux(2)
Qout = flow.getBoundaryFlux(3)
permeability = abs(Qin)/1.e-4 #size is one, we compute K=V/∇H
print("Qin=",Qin," Qout=",Qout," permeability=",permeability)
#C. now the oedometer test, drained at the top, impermeable at the
bottom plate
flow.bndCondIsPressure=[0,0,0,1,0,0]
flow.bndCondValue=[0,0,0,0,0,0]
flow.updateTriangulation=True #force remeshing to reflect new BC
immediately
newton.damping=0
triax.goal2=-11000
O.run(1000,1)
print('saving oedometer state with pore pressure
at',flow.getPorePressure((0.5,0.1,0.5)))
O.save('oedometer_state.yade.gz')
else:
O.load('oedometer_state.yade.gz')
print('loaded oedometer state with pore pressure
at',flow.getPorePressure((0.5,0.1,0.5)))
O.run(100,1)
from yade import plot
def history():
plot.addData(t=O.time,p=flow.getPorePressure((0.5,0.1,0.5)),s22=-triax.stress(3)[1]-10000)
O.engines=O.engines+[PyRunner(iterPeriod=200,command='history()',label='recorder')]
from yade import plot
plot.plots={'t':('p')}
plot.plot()
[1]https://gitlab.com/yade-dev/trunk/blob/master/examples/simple-scene/save-then-reload.py
[2]https://gitlab.com/yade-dev/trunk/blob/master/examples/FluidCouplingPFV/oedometer.py
[3]https://gitlab.com/yade-dev/trunk/blob/master/lib/triangulation/FlowBoundingSphereLinSolv.ipp#L598
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