Hi, I am trying to do HM coupling with cylinder sample.Under the confining pressure of 30MPa,I have get the result of which the flow pressure is 10,20,30MPa. However,when I add the flow pressure to 40 and 50MPa,I get the following error prompt and my simulation stop: ### AREA <= 0!! AREA <= 0!! AREA <= 0!! AREA <= 0!! AREA <= 0!! AREA <= 0!! AREA <= 0!! ThreadRunner:35 void yade::ThreadRunner::run(): Exception occured: CGAL ERROR: assertion violation! Expr: dexp != 2047 File: /usr/include/CGAL/Mpzf.h Line: 411 Explanation: Creating an Mpzf from infinity or NaN. ### I do not know what happened.I will attach my code in the end.Thanks for anyone help! ###code### from yade import pack, ymport, plot, utils, export, timing import numpy as np import sys damp=0.4 young=66.2e9 name='JCFPM_triax' poisson=0.522 name='cylinder' preStress=-30e6 strainRate = -0.1 OUT=str(preStress)+'_JCFPM_triax' r1=0.002 r2=0.01 nw=24 nh=15 rParticle=0.000731723 bcCoeff = 5 width = 0.025 height = 0.05 allx,ally,allz,r=np.genfromtxt('packing-cylinder.spheres', unpack=True) mnx=min(allx)*1.01 #same as aabbExtrema, get the xyz of the lowest corner, multiply by factor to reduce it to let the wall surround all the spheres. mny=min(ally)*1.01 mnz=min(allz)*0.99 mxx=max(allx)*1.01 #same as aabbExtrema, get the xyz of the top corner, multiply by factor to increase it to let the wall surround all the spheres. mxy=max(ally)*1.01 mxz=max(allz)*1.01 Sy=50e6 O.materials.append(JCFpmMat(type=1,density=2640,young=young,poisson=poisson,tensileStrength=8e6,cohesion=40e6,frictionAngle=radians(25),label='sphere')) O.materials.append(JCFpmMat(type=1,label='wall1',young=young,poisson=poisson,frictionAngle=radians(25))) O.materials.append(JCFpmMat(type=1,frictionAngle=0,density=0,label='wall2')) mn,mx=Vector3(mnx,mny,mnz),Vector3(mxx,mxy,mxz) walls=aabbWalls([mn,mx],thickness=0,material='wall2') wallIds=O.bodies.append(walls) bottom,top=Vector3(0,0,0),Vector3(0,0,0.05) sp=pack.SpherePack() pred=pack.inCylinder(bottom,top,radius) sp=pack.randomDensePack(pred,radius=0.0005,rRelFuzz=0,returnSpherePack=True,memoizeDb='/tmp/triax.sqlite') spheres=sp.toSimulation(color=(0.9,0.8,0.6),material='sphere') bot = [O.bodies[s] for s in spheres if O.bodies[s].state.pos[2]height-rParticle*bcCoeff] vel = strainRate*(height-rParticle*2*bcCoeff) for s in bot: s.shape.color = (1,0,0) s.state.blockedDOFs = 'xyzXYZ' #s.state.vel = (0,0,-vel) for s in top: s.shape.color = Vector3(0,1,0) s.state.blockedDOFs = 'xyzXYZ' s.state.vel = (0,0,vel) facets = [] rCyl2 = .5*width / cos(pi/float(nw)) for r in range(nw): for h in range(nh): v1 = Vector3( rCyl2*cos(2*pi*(r+0)/float(nw)), rCyl2*sin(2*pi*(r+0)/float(nw)), height*(h+0)/float(nh) ) v2 = Vector3( rCyl2*cos(2*pi*(r+1)/float(nw)), rCyl2*sin(2*pi*(r+1)/float(nw)), height*(h+0)/float(nh) ) v3 = Vector3( rCyl2*cos(2*pi*(r+1)/float(nw)), rCyl2*sin(2*pi*(r+1)/float(nw)), height*(h+1)/float(nh) ) v4 = Vector3( rCyl2*cos(2*pi*(r+0)/float(nw)), rCyl2*sin(2*pi*(r+0)/float(nw)), height*(h+1)/float(nh) ) f1 = facet((v1,v2,v3),color=(0,0,1),material='wall1') f2 = facet((v1,v3,v4),color=(0,0,1),material='wall1') facets.extend((f1,f2)) O.bodies.append(facets) mass = O.bodies[7].state.mass for f in facets: f.state.mass = mass f.state.blockedDOFs = 'XYZz' def lateral(): elatTot=0.0 nTot=0 for b in O.bodies: x=b.state.refPos[0] y=b.state.refPos[1] d=sqrt(pow(x,2)+pow(y,2)) if d > r1 and d < r2: b.shape.color=(0.6,0.5,0.15) xnew=b.state.pos[0] ynew=b.state.pos[1] dnew=sqrt(pow(xnew,2)+pow(ynew,2)) elat=(dnew-d)/d elatTot+=elat nTot+=1 elat_avg=elatTot/nTot return elat_avg def addForces(): for f in facets: n = f.shape.normal a = f.shape.area O.forces.addF(f.id,preStress*a*n) def stopIfDamaged(maxEps=0.001): extremum = max(abs(s) for s in plot.data['s']) s = abs(plot.data['s'][-1]) e = abs(plot.data['e'][-1]) if O.iter < 1000 or e < maxEps: return if abs(s)/abs(extremum) < 0.5 : print('Simulation finished') presentcohesive_count = 0 for i in O.interactions: if hasattr(i.phys, 'isCohesive'): if i.phys.isCohesive == True: presentcohesive_count+=1 print('the number of cohesive bond now is:',presentcohesive_count) print('Max stress and strain:',extremum,e) O.pause() O.dt=.5*utils.PWaveTimeStep() newton=NewtonIntegrator(damping=damp) O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=1.5,label='is2aabb'),Bo1_Facet_Aabb(),Bo1_Box_Aabb()]), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=1.5,label='ss2sc'),Ig2_Facet_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()], [Ip2_JCFpmMat_JCFpmMat_JCFpmPhys()], [Law2_ScGeom_JCFpmPhys_JointedCohesiveFrictionalPM(recordCracks=True,Key=OUT+'_Crack',label='interactionLaw')] ), PyRunner(iterPeriod=1,command="addForces()"), FlowEngine(dead=1,label="flow"), newton, PyRunner(command='plotAddData()',iterPeriod=100), PyRunner(iterPeriod=2000,command='stopIfDamaged()'), ] def plotAddData(): elat_avg=lateral() Qin = flow.getBoundaryFlux(4) perm = abs(Qin) * flow.viscosity * height / (A * Sy) f1 = sum(O.forces.f(b.id)[2] for b in top) f2 = sum(O.forces.f(b.id)[2] for b in bot) f = .5*(f2-f1) s = f/(pi*.25*width*width) e = (top[0].state.displ()[2] - bot[0].state.displ()[2]) / (height-rParticle*2*bcCoeff) plot.addData( elateral = elat_avg, i = O.iter, s = -s, e = -e, tc = interactionLaw.nbTensCracks, sc = interactionLaw.nbShearCracks, permeability = perm ) plot.saveDataTxt(OUT) O.step() ss2sc.interactionDetectionFactor=-1 is2aabb.aabbEnlargeFactor=-1 flow.debug=False flow.permeabilityMap = False flow.defTolerance=-1 flow.meshUpdateInterval=100 flow.fluidBulkModulus=2.2e9 flow.useSolver=4 flow.permeabilityFactor=1 flow.viscosity= 0.001 flow.decoupleForces = False flow.bndCondIsPressure=[1,1,1,1,1,1] flow.bndCondValue=[0,0,0,0,0,Sy] flow.dead=0 flow.emulateAction() plot.plots = { 'e':('s',), 'elateral':('s'),} plot.plot() O.run() ####

When	Who	Action	New State
2022-07-07	Bruno Chareyre	Answer	Answered
2022-07-07	Ziyu Wang	Comment	Answered
2022-07-08	Ziyu Wang	Reopen	Open
2022-07-23	Launchpad Janitor	Expire	Expired

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