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[Zhang Wenyue <question670889@xxxxxxxxxxxxxxxxxxxxx>]

New question #670889 on Yade:
https://answers.launchpad.net/yade/+question/670889

Hi,

I'm also doing some work related to the removal of particles, and I have a problem similar to Question #452277.
https://answers.launchpad.net/yade/+question/452277

 I tried to set the flowEngine.dead=1 and then set it to 0 after few steps, which didn't work. I tried to slice the list of engines to instantiate the flowEngine, which led to memory leak. Do anyone have a way to release the memory effectively?

Can anyone give me some suggestion? Thanks a lot.
I'm running Yade 2018.02b, Ubuntu 18.04.

My code is shown as follow:
=============================================

from yade import pack,qt,plot

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(2,2,6) # corners of the initial packing
flag=1
flag2=0

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)

sp=pack.SpherePack()
sp.makeCloud(mn,mx,rMean=0.3,rRelFuzz=0,num=50,periodic=False)
sp.makeCloud(mn,mx,rMean=0.03,rRelFuzz=0,num=1000,periodic=False)
sp.toSimulation(material='spheres')

triax=TriaxialStressController(
	thickness = 0,
	stressMask = 7,
	max_vel = 0.005,
	internalCompaction=0, # If true the confining pressure is generated by growing particles
#    wall_bottom_activated=False
)

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, see 2nd section
	GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
	triax,
	newton,
]

triax.goal1=triax.goal2=triax.goal3=-10000

while 1:
  O.run(1000,1)
  unb=unbalancedForce()
  if unb<0.001 and abs(-10000-triax.meanStress)/10000<0.001:
    break

setContactFriction(radians(finalFricDegree))

## ______________   Oedometer section   _________________

triax.stressMask=7
triax.goal1=triax.goal2=triax.goal3=-10000

#B. Activate flow engine and set boundary conditions in order to get permeability

flow.dead=0
flow.defTolerance=0.3
flow.meshUpdateInterval=100
flow.useSolver=3
flow.permeabilityFactor=1
flow.viscosity=10
flow.bndCondIsPressure=[0,0,0,0,1,1]
flow.bndCondValue=[0,0,0,0,100,0]
flow.boundaryUseMaxMin=[0,0,0,0,0,0]
O.dt=0.1e-4
O.dynDt=False

newton.damping=0
triax.wall_back_activated=0
O.engines=O.engines+[PyRunner(command='addPlotData()',iterPeriod=100),]
O.engines=O.engines+[PyRunner(command='erosion()',iterPeriod=100),]

def erosion():
    global flag
    global flag2
    k=0
    if flag:
        for i in O.interactions:
            if i.id1==5:
                if i.id2>5 and O.bodies[i.id2].shape.radius<0.1:
                    k=i.id2
                    O.interactions.erase(i.id1, i.id2)
                    O.bodies.erase(k)
                    flag2=1
            if i.id2==5:
                if i.id1>5 and O.bodies[i.id1].shape.radius<0.1:
                    k=i.id1
                    O.interactions.erase(i.id1, i.id2)
                    O.bodies.erase(k)
                    flag2=1
        if flag2:
            flag=0
            O.pause()
            O.engines=O.engines[0:3]+O.engines[4:]
            O.step()
            O.step()
            O.engines=O.engines[0:3]+[FlowEngine(dead=0,label="flow"),]+O.engines[3:]
            flow.defTolerance = 0.3
            flow.meshUpdateInterval = 100
            flow.useSolver = 3
            flow.permeabilityFactor = 1
            flow.viscosity = 10
            flow.bndCondIsPressure = [0, 0, 0, 0, 1, 1]
            flow.bndCondValue = [0, 0, 0, 0, 100, 0]
            flow.boundaryUseMaxMin = [0, 0, 0, 0, 0, 0]
            O.dt = 0.1e-4
            O.dynDt = False
            O.step()
            O.step()
            O.step()
            flag=1
            O.run()
=============================================

Best,
Zhang Wenyue

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