Question #688685 on Yade changed: https://answers.launchpad.net/yade/+question/688685
Status: Answered => Open Othman Sh is still having a problem: It make sense to me. But when I tried it still I got errors. So I went back to the oedometer code [1] and removed the triax part and reduced the code to just permeability. I realized that it will work until I remove the walls surrounding the packing. If I remove the walls and set flow.boundaryUseMaxMin=[1,1,1,1,1,1] then it will give me this error negative volume for an ordinary pore (temp warning, should still be safe) *** stack smashing detected ***: <unknown> terminated Aborted (core dumped) Any idea why? So now the code below with the aabbWalls works fine (although the averageVelocity() results is super high!). Do you think that having a box (6 walls) surrounding a cylindrical sphere packing will give different results than if the cylindrical sphere packing was surrounded by a cylindrical wall? Thanks, Othman [1] https://github.com/yade/trunk/blob/master/examples/FluidCouplingPFV/oedometer.py --------------------------------------------------- # -*- coding: utf-8 -*- from __future__ import print_function from builtins import range from yade import pack, ymport radiuscyl=.08 heightcyl=.25 dP=4e3 #Pa visc=1e-3 #Pa.sec density=1000 #kg/m3 g=9.81 #m/s2 young=1e6 mn,mx=Vector3(0.12051283763637842,0.12120598296516694,0.000018575942022891825),Vector3(0.2788652537183969,0.27855505606930653,0.24827692256149453) # corners of the box that contain the packing. Obtained from aabbExtrema O.materials.append(FrictMat(young=young,poisson=0.2,density=1900,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) yade.qt.View() ############################# spheres ############################# sp=pack.SpherePack() sp.makeCloud((0,0,0),(.4,.4,2),rMean=0.0083,rRelFuzz=0.1,seed=1) ### cylinder extraction pred=pack.inCylinder((.2,.2,0),(.2,.2,heightcyl),radiuscyl) spFilter=filterSpherePack(pred,sp,Material=Material, returnSpherePack=True) spFilter.toSimulation() Height=max(utils.aabbDim()) #Fix all particles in their positions. No deformation for i in O.bodies: i.state.blockedDOFs='xyzXYZ' 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), NewtonIntegrator(damping=0.2) ] #B. Activate flow engine and set boundary conditions in order to get permeability flow.dead=0 flow.useSolver=3 flow.permeabilityFactor=1 flow.viscosity=visc flow.bndCondIsPressure=[0,0,0,0,1,1] flow.bndCondValue=[0,0,0,0,0,dP] flow.boundaryUseMaxMin=[0,0,0,0,1,1] O.dt=0.1e-8 O.dynDt=False O.run(1,1) Q=max(flow.averageVelocity()) Permeability=abs((density*g*Q*Height)/dP) print ("average velocity: ",Q, "Permeability m/s: ",Permeability,"Permeability in/hr: ", Permeability*141732) -- You received this question notification because your team yade-users is an answer contact for Yade. _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp