Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 JOHN confirmed that the question is solved: Thanks Jan Stránský, that solved my question. -- 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
Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 Status: Answered => Solved JOHN confirmed that the question is solved: Thanks for that, wall stiffness helped considerable regards John -- 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
Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 Status: Open => Answered Jan Stránský proposed the following answer: Hi John, please really try to make the example be working, i.e. try to run it yourself. There are too many undefined variables (e.g. restart could be tested True or False, but loc2glob is missing completely..) To prevent particles go through walls, you can try: - increase stiffness of walls or both walls and particles - decrease time step (if your problem is not in stable regime) cheers Jan -- 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
Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed:
https://answers.launchpad.net/yade/+question/665540
Status: Needs information => Open
JOHN gave more information on the question:
boundaries = [-75.0, 75.4, -75.013, 75.387, 0.0, 15.201]
Yadesimulation.run("maze1.stl",boundaries2,0,100)
So the problem is, this will propably not show the error. The thing that
causes it ironically i dont have the right to give.
I was hoping more on a general method on how to extract particles from the wall
the fastest with the least amount of unphysical behaviour possible for a
general case
I appreciate the difficulty of the question and i really appreciate your help
so far
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Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 Status: Open => Needs information Jan Stránský requested more information: thanks for the file. Now please make the example working :-D i.e. with what arguments do you call run(...)? thx Jan -- 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
Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 Status: Needs information => Open JOHN gave more information on the question: http://dropmefiles.com/zwMDt But the issue appears almost randomly after some rotations. -- 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
Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 Status: Open => Needs information Jan Stránský requested more information: Please also provide the stl file thanks Jan -- 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
Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 Status: Needs information => Open JOHN gave more information on the question: Hello, the used timestep is O.dt=.8*PWaveTimeStep() and the initialization deletes all the particles that are initially partly or fully inside the walls -- 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
Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 Status: Solved => Open JOHN is still having a problem: minimal working example follows def run(name,boundaries,r,gap,numStepsPerIteration): facets = ymport.stl(name) rod1 = O.bodies.append(facets) # converts facets to gts (see the other question) s = gts.Surface() for facet in facets: vs = [facet.state.pos + facet.state.ori*v for v in facet.shape.vertices] vs = [gts.Vertex(v[0],v[1],v[2]) for v in vs] es = [gts.Edge(vs[i],vs[j]) for i,j in ((0,1),(1,2),(2,0))] f = gts.Face(es[0],es[1],es[2]) s.add(f) print s.is_closed() threshold = 1e-3 s.cleanup(threshold) print s.is_closed() assert s.is_closed() # use gts to filter spheres pred = inGtsSurface(s) sp=pack.regularHexa(pack.inAlignedBox((boundaries[0],boundaries[2],boundaries[4]),(boundaries[1],boundaries[3],boundaries[5])),radius=r,gap=gap) # remove spheres completely inside walls for b in sp: if pred(b.state.pos,0): continue O.bodies.append(b) # remove spheres partially inside walls O.dt = 0 O.step() # interactions are created afterwards toErase = set() for i in O.interactions: b1,b2 = [O.bodies[i] for i in (i.id1,i.id2)] if any(isinstance(b.shape,Facet) for b in (b1,b2)): # if facet is involved, delete toErase.add(b1) toErase.add(b2) toErase = [b for b in toErase if isinstance(b.shape,Sphere)] # delete just spheres if not restart: for b in toErase: # delete the spheres O.bodies.erase(b.id) #generate the initial global index list for b in O.bodies: if isinstance(b.shape,Sphere): loc2glob.append(b.id) O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]), InteractionLoop( # handle sphere+sphere and facet+sphere collisions [Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()], [Ip2_FrictMat_FrictMat_FrictPhys()], [Law2_ScGeom_FrictPhys_CundallStrack()] ), NewtonIntegrator(gravity=(0,-9.81,0),damping=0.4, label='newtonInt'), ] O.dt=.8*PWaveTimeStep() O.step() -- 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
Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 Status: Open => Solved JOHN confirmed that the question is solved: minimal working example follows def run(name,boundaries,r,gap,numStepsPerIteration): facets = ymport.stl(name) rod1 = O.bodies.append(facets) # converts facets to gts (see the other question) s = gts.Surface() for facet in facets: vs = [facet.state.pos + facet.state.ori*v for v in facet.shape.vertices] vs = [gts.Vertex(v[0],v[1],v[2]) for v in vs] es = [gts.Edge(vs[i],vs[j]) for i,j in ((0,1),(1,2),(2,0))] f = gts.Face(es[0],es[1],es[2]) s.add(f) print s.is_closed() threshold = 1e-3 s.cleanup(threshold) print s.is_closed() assert s.is_closed() # use gts to filter spheres pred = inGtsSurface(s) sp=pack.regularHexa(pack.inAlignedBox((boundaries[0],boundaries[2],boundaries[4]),(boundaries[1],boundaries[3],boundaries[5])),radius=r,gap=gap) # remove spheres completely inside walls for b in sp: if pred(b.state.pos,0): continue O.bodies.append(b) # remove spheres partially inside walls O.dt = 0 O.step() # interactions are created afterwards toErase = set() for i in O.interactions: b1,b2 = [O.bodies[i] for i in (i.id1,i.id2)] if any(isinstance(b.shape,Facet) for b in (b1,b2)): # if facet is involved, delete toErase.add(b1) toErase.add(b2) toErase = [b for b in toErase if isinstance(b.shape,Sphere)] # delete just spheres if not restart: for b in toErase: # delete the spheres O.bodies.erase(b.id) #generate the initial global index list for b in O.bodies: if isinstance(b.shape,Sphere): loc2glob.append(b.id) O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]), InteractionLoop( # handle sphere+sphere and facet+sphere collisions [Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()], [Ip2_FrictMat_FrictMat_FrictPhys()], [Law2_ScGeom_FrictPhys_CundallStrack()] ), NewtonIntegrator(gravity=(0,-9.81,0),damping=0.4, label='newtonInt'), ] O.dt=.8*PWaveTimeStep() O.step() -- 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
Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 Status: Open => Needs information Jan Stránský requested more information: Hi John, please provide a MWE. E.g., the used time step could affect this thanks Jan -- 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
Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 Description changed to: Good evening, I run a very simple simulation with default material. As it turns out, some of the particles find themselves partially inside the walls after some iterations. This is to be expected of a DEM method, but they can exit on their own. Is there a way to fix this? I would expect the forces produced by the wall sphere interaction to be strong enough to take every particle out by the time the system rests. Thank you very much for any help. Best Regards John PS the simulation is really simple, just an exit taken from the example and a function to calculate a new gravity vector when the system rests. -- 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
Re: [Yade-users] [Question #665540]: particles partially in the wall
Question #665540 on Yade changed: https://answers.launchpad.net/yade/+question/665540 Description changed to: Good evening, I run a very simple simulation with default material. As it turns out, some of the particles find themselves partially inside the walls after some iterations. This is to be expected of a DEM method, but they can exit on their own. Is there a way to fix this? I would expect the forces produced by the wall sphere interaction to be strong enough to take every particle out by the time the system rests. Thank you very much for any help. Best Regards John -- 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
[Yade-users] [Question #665540]: particles partially in the wall
New question #665540 on Yade: https://answers.launchpad.net/yade/+question/665540 Good evening, I run a very simple simulation with default material. As it turns out, some of the particles find themselves partially inside the walls after some iterations. This is to be expected of a DEM method, but they can exit on their own. Is there a way to fix this? I would expect the forces produced by the wall sphere interaction to be strong enough to take every particle out by the time the system rests. Thank you very much for any help. Best Regards Ioannis -- 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
