[Yade-users] [Question #695246]: clumping gridNodes and Ppfacets into a clump
New question #695246 on Yade: https://answers.launchpad.net/yade/+question/695246 Hi, I got problems when clumping nodes and pfacets into a clump. There are several ways to creat Pfacets and I tried two of them, both did't work. Here is one way I tried. And the error says: Traceback (most recent call last): File "/usr/bin/yade", line 182, in runScript execfile(script,globals()) File "1-29-clump.py", line 32, in abc= O.bodies.append(pfacet(nodes[0],nodes[1],nodes[2],wire=True,material='pFacetMat',color=color)) File "/usr/lib/x86_64-linux-gnu/yade/py/yade/gridpfacet.py", line 211, in pfacet GridC1=O.bodies[O.interactions[id1,id2].geom.connectionBody.id] AttributeError: 'ScGeom' object has no attribute 'connectionBody' Please help me with it. Thanks! from yade.gridpfacet import * from yade import pack, plot from numpy import * import math from yade import utils, qt import random from yade import polyhedra_utils, qt color=[0.,1.,1.] O.materials.append( CohFrictMat( young=3e6,poisson=0.15,density=910e0,frictionAngle=20,normalCohesion=3e100,shearCohesion=3e100,momentRotationLaw=True,label='gridNodeMat' ) )#for gridNodes O.materials.append(FrictMat(young=4e6,poisson=0.3,density=1000,frictionAngle=20,label='pFacetMat')) #for pfacet RNode=0.2 nodes=[] #up 0123 aa= nodes.append(O.bodies.append( gridNode([-110e-3, 110e-3,-200e-3],RNode,wire=True,fixed=False,material='gridNodeMat') )) bb= nodes.append(O.bodies.append( gridNode([ 110e-3, 110e-3,-200e-3],RNode,wire=True,fixed=False,material='gridNodeMat') )) cc= nodes.append(O.bodies.append( gridNode([ 110e-3,-110e-3,-200e-3],RNode,wire=True,fixed=False,material='gridNodeMat') )) dd= nodes.append(O.bodies.append( gridNode([-110e-3,-110e-3,-200e-3],RNode,wire=True,fixed=False,material='gridNodeMat') )) ab= O.bodies.append(gridConnection(nodes[0],nodes[1],RNode,wire=True,material='gridNodeMat')) ac= O.bodies.append(gridConnection(nodes[0],nodes[2],RNode,wire=True,material='gridNodeMat')) ad= O.bodies.append(gridConnection(nodes[0],nodes[3],RNode,wire=True,material='gridNodeMat')) bc= O.bodies.append(gridConnection(nodes[1],nodes[2],RNode,wire=True,material='gridNodeMat')) bd= O.bodies.append(gridConnection(nodes[2],nodes[3],RNode,wire=True,material='gridNodeMat')) abc= O.bodies.append(pfacet(nodes[0],nodes[1],nodes[2],wire=True,material='pFacetMat',color=color)) acd= O.bodies.append(pfacet(nodes[0],nodes[2],nodes[3],wire=True,material='pFacetMat',color=color)) clump1=O.bodies.appendClumped([\ aa, bb, cc, dd, ab, ac, ad, bc, bd, abc, acd ]) ### Thanks! -- 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 #695245]: Error when running on HPC
New question #695245 on Yade: https://answers.launchpad.net/yade/+question/695245 Hello, I'm trying to run Yade on HPC. Our IT helped me set up a singularity under my account. It seems to be OK with launching Yade. But when I actually tried to run the script same as the one in the thermal coupling example [1] (omitted the graphic plot part), the following error occurred after 6000 iterations: ThreadRunner:35 void yade::ThreadRunner::run(): Exception occured: CGAL ERROR: assertion violation! Expr: dexp != 2047 File: /usr/include/CGAL/Mpzf.h Line: 448 Explanation: Creating an Mpzf from infinity or NaN. I tried to typed printAllVersions(), I got the following: ``` Yade version : 2021.01a Yade features : BoostLog PrecisionDouble Odeint VTK OpenMP GTS GUI-Qt5 CGAL PFVFLOW PFVFLOW LINSOLV TWOPHASEFLOW SPH FEMLIKE GL2PS LBMFLOW THERMAL PARTIALSAT PotentialParticles Yade config dir: ~/.yade Yade precision : 53 bits, 15 decimal places, without mpmath ``` Libraries used : | library | cmake | C++ | | - | - | --- | | boost | 1.74.0| 1.74.0 | | cgal | | 5.2 | | cmake | 3.18.4| | | compiler | /usr/bin/c++ 10.2.1 | gcc 10.2.1 | | eigen | 3.3.9 | 3.3.9 | | freeglut | 2.8.1 | | | gl| | 20190805| | ipython | 7.19.0| | | metis | | 5.1.0 | | openblas | | OpenBLAS 0.3.10| | python| 3.9.1 | 3.9.1 | | qglviewer | | 2.6.3 | | qt| | 5.15.2 | | sqlite| | 3.34.0 | | suitesparse | 5.8.1 | 5.8.1 | | vtk | 9.0.1 | 9.0.1 | ``` Linux version : Ubuntu Hirsute Hippo (development branch) Architecture : amd64 Little endian : True ``` I'm wondering where it may go wrong? What is missing from the installation that cause this problem. Thank you. Best Jiannan [1]: https://gitlab.com/yade-dev/trunk/-/blob/master/examples/ThermalEngine/thermoHydroMechanical_coupling.py -- 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] Yade 2021.01a is released
Dear Yade users and developers, As always at the beginning of the year we are releasing the newer Yade version. A couple of days ago Yade 2021.01a was released [1]! Thanks all for contributions! Special thanks to Janek for his contribution and preparing the release notes! French team thanks for pushing MPI version of the Yade and other features and fixes! [1] https://gitlab.com/yade-dev/trunk/-/releases/2021.01a Best regards Anton ___ 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 #695226]: RungeKuttaCashKarp54Integrator with gridConnections is causing errors
Question #695226 on Yade changed: https://answers.launchpad.net/yade/+question/695226 Bruno Chareyre posted a new comment: > It could be that there is a mismatch between what you input at the interactions scale and what you expect in terms of damping at the structural scale I would say the bending viscosity of the interactions should be a multiple of ~N/L, do we agree on that? > https://github.com/rohitkjohnedu/yade_laws . Problem here is we can't see you changes. >From the top of my head, you need to do something like: 0. get sources with "git clone" 1. edit sources 2. "git commit -a -m 'that's my change'" 3. git push to gitlab/github whatever This way we can see what was done specifically in step 1 Bruno -- 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 #695226]: RungeKuttaCashKarp54Integrator with gridConnections is causing errors
Question #695226 on Yade changed: https://answers.launchpad.net/yade/+question/695226 Bruno Chareyre posted a new comment: You are past-the-end of my checklist. :) RungeKuttaCashKarp54Integrator makes sense then. Last one maybe: in a working case (small damping), did you find consistency _at the structural scale_ in terms of damping the oscillations? It could be that there is a mismatch between what you input at the interactions scale and what you expect in terms of damping at the structural scale? > is similar to forward Euler Yes and no. It is a 2nd order time centered scheme from Newton's point of view. Problem is velocities are not known on step, they are know at mid-steps. So this wonderful scheme for mass-spring systems becomes a poor 1st order Euler when there are viscous terms. If you take mid-steps as your frame of reference and you think to what happens to velocities wrt. visous forces it is plain explicit Euler, you are right. There are ways to evaluate on-step velocites (something similar to "velocity Verlet" [1]) which we don't use. It should improve your case, it needs some changes in the integrator and it needs two calculations of forces per time iteration. > the RungeKuttaCashKarp54Integrator is extremely slow. Because there are even more than two calculations of forces per time iteration, I guess? Do you mean that despite larger timesteps it is still slower? Bruno [1] https://en.wikipedia.org/wiki/Verlet_integration -- 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 #695226]: RungeKuttaCashKarp54Integrator with gridConnections is causing errors
Question #695226 on Yade changed: https://answers.launchpad.net/yade/+question/695226 Rohit John posted a new comment: Dear Bruno, > what happens with super-small O.dt? (defining what is "super-small" needs to > think about mass-viscosity-stiffness parameters) - It depends on the damping fraction and the material stiffness. I wrote the code such that the damping coefficient is a fraction of the stiffness. (Same fraction for normal, shear, twist and bending stiffness in Law2_ScGeom6D_CohFrictPhys_CohesionMoment). At small time steps it works, but if I want higher damping I must reduce the time step. For one simulation it had to be 1e-10. Even days were not enough to get some useful result. > are the directions of forces, moment, velocities and spin consistent, with > just 2-3 nodes after 2 iterations? I checked the values and when the damping and dt were badly set, the forces and velocities grow exponentially, but when I reduce the dt or damping they "calm down". >From my understanding the integrator in YADE is similar to forward Euler which is unstable when there is damping. So I though changing the integrator might help. Janek Kozicki solution works but the RungeKuttaCashKarp54Integrator is extremely slow. If possible could you check could the code found here: https://github.com/rohitkjohnedu/yade_laws . Kind regards, Rohit K. 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 #695226]: RungeKuttaCashKarp54Integrator with gridConnections is causing errors
Question #695226 on Yade changed: https://answers.launchpad.net/yade/+question/695226 Status: Answered => Solved Rohit John confirmed that the question is solved: Thanks Janek Kozicki, 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 #695058]: Bending beams mass computation
Question #695058 on Yade changed:
https://answers.launchpad.net/yade/+question/695058
Status: Open => Answered
Bruno Chareyre proposed the following answer:
Here is a fix for your test. :)
mass computation
realLength= (O.bodies[n-1].state.pos-O.bodies[0].state.pos).norm()# first
node to last node of first beam
ana_beam_mass = r**2 * math.pi * realLength * O.bodies[0].material.density
totalActiveMass = sum( [O.bodies[id].state.mass for id in nodesIds] )
print("analytical mass",ana_beam_mass," vs. numerical mass ",totalActiveMass/4)
##
Output:
analytical mass 11.519173063162576 vs. numerical mass 11.519173063162569
Arguably the function "cylinderConnection()" can be confusing. It produces a
node to to node distance which is less than L/N since it includes the spherical
caps in L.
OTOH the total mass is defined by neglecting the spherical caps, hence an
apparent inconsistency.
Another thing is that the cylinderConnections are never dynamic, they
are just folloing the nodes. They turn out to have have a mass because
some constructors define one by default, but it is not actually used
anywhere. So total mass of the beam is the mass of its nodes.
For very short objects it might not be a good idea to neglect the mass
of spherical caps. On the other hand it would be painfull to compare to
beam theory if the mass was not uniformly distributed (currently it is,
with end nodes having 0.5*mass of center nodes, it wouldn't with
spherical caps).
In the end, all this is just pre-processing by some python helper
function. You can easily assign mass per-node the way you like it, and
you could also bend a modified version of cylinderConnection() to your
liking.
HTH
Bruno
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Re: [Yade-users] [Question #695192]: wall.append(O.bodies.append(pfacet) in triaxial test
Question #695192 on Yade changed: https://answers.launchpad.net/yade/+question/695192 Status: Needs information => Answered xxxea proposed the following answer: Thanks for your patience! I have read the article about Pfacet and I think it is what I want for wall as to act as soft membrane.And I tried to clump nodes and pfacs as you suggest but it didn't work. Could you help me with it?(I have commented on this question earlier) Thanks! zhanghanying 邮箱：zhanghany...@buaa.edu.cn 签名由 网易邮箱大师 定制 On 01/28/2021 23:55, Bruno Chareyre wrote: Your question #695192 on Yade changed: https://answers.launchpad.net/yade/+question/695192 Status: Open => Needs information Bruno Chareyre requested more information: That's too many questions for me, sorry. Simple answer: you did not show a problem with Box's, you showed a problem with Wall's (aabbWalls()) Walls are not Boxes. :) This being said I would have expected this to work with walls too. Could you please show the pfacet-box or pfacet-wall problem in a MWE [1]? Bruno [1] https://www.yade-dem.org/wiki/Howtoask -- To answer this request for more information, you can either reply to this email or enter your reply at the following page: https://answers.launchpad.net/yade/+question/695192 You received this question notification because you asked the 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 #695192]: wall.append(O.bodies.append(pfacet) in triaxial test
Question #695192 on Yade changed: https://answers.launchpad.net/yade/+question/695192 Status: Open => Needs information Bruno Chareyre requested more information: That's too many questions for me, sorry. Simple answer: you did not show a problem with Box's, you showed a problem with Wall's (aabbWalls()) Walls are not Boxes. :) This being said I would have expected this to work with walls too. Could you please show the pfacet-box or pfacet-wall problem in a MWE [1]? Bruno [1] https://www.yade-dem.org/wiki/Howtoask -- 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 #695192]: wall.append(O.bodies.append(pfacet) in triaxial test
Question #695192 on Yade changed:
https://answers.launchpad.net/yade/+question/695192
Hanying Zhang gave more information on the question:
And the error says:
File "1-28.py", line 124, in
ab=
O.bodies.append(gridConnection(aa,bb,RNode,wire=True,material='gridNodeMat'))
File "/usr/lib/x86_64-linux-gnu/yade/py/yade/gridpfacet.py", line 109, in
gridConnection
sph1=O.bodies[id1] ; sph2=O.bodies[id2]
ArgumentError: Python argument types in
BodyContainer.__getitem__(BodyContainer, NoneType)
did not match C++ signature:
__getitem__(pyBodyContainer {lvalue}, int)
Thanks!
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Re: [Yade-users] [Question #695192]: wall.append(O.bodies.append(pfacet) in triaxial test
Question #695192 on Yade changed: https://answers.launchpad.net/yade/+question/695192 Hanying Zhang gave more information on the question: I got problems when clumping nodes and pfacets into a clump. There are several ways to creat Pfacets and I tried two of them, both did't work. Here is one way I tried. Please help me with it. Thanks! nodes=[] #up aa= nodes.append(O.bodies.append( gridNode([-110e-3, 110e-3,-200e-3],RNode,wire=True,fixed=False,material='gridNodeMat') )) bb=nodes.append(O.bodies.append( gridNode([ 110e-3, 110e-3,-200e-3],RNode,wire=True,fixed=False,material='gridNodeMat') )) cc= nodes.append(O.bodies.append( gridNode([ 110e-3,-110e-3,-200e-3],RNode,wire=True,fixed=False,material='gridNodeMat') )) dd= nodes.append(O.bodies.append( gridNode([-110e-3,-110e-3,-200e-3],RNode,wire=True,fixed=False,material='gridNodeMat') )) ab= O.bodies.append(gridConnection(aa,bb,RNode,wire=True,material='gridNodeMat')) ac= O.bodies.append(gridConnection(aa,cc,RNode,wire=True,material='gridNodeMat')) ad= O.bodies.append(gridConnection(aa,dd,RNode,wire=True,material='gridNodeMat')) bc= O.bodies.append(gridConnection(bb,cc,RNode,wire=True,material='gridNodeMat')) bd= O.bodies.append(gridConnection(bb,dd,RNode,wire=True,material='gridNodeMat')) abc= O.bodies.append(pfacet(aa,bb,cc,wire=True,material='pFacetMat',color=color)) acd= O.bodies.append(pfacet(aa,cc,dd,wire=True,material='pFacetMat',color=color)) clump1=O.bodies.appendClumped([\ aa, bb, cc, dd, ab, ac, ad, bc, bd, abc, acd ]) ### Thanks! -- 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 #695226]: RungeKuttaCashKarp54Integrator with gridConnections is causing errors
Question #695226 on Yade changed: https://answers.launchpad.net/yade/+question/695226 Bruno Chareyre requested more information: > I added viscous damping to the source code of Law2_ScGeom6D_CohFrictPhys_CohesionMoment, this caused the NewtonIntegrator to be unstable Quick note: We can't really try since we don't have your specific damping model. You could push to a gitlab branch at some point if you want someone to be able to try the script with relevant code version. Maybe you did that already, but before trying another integrator (or higher number precision ;) ), I would go through this checkList: - what happens with super-small O.dt? (defining what is "super-small" needs to think about mass-viscosity-stiffness parameters) - are the directions of forces, moment, velocities and spin consistent, with just 2-3 nodes after 2 iterations? Cheers Bruno -- 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 #695226]: RungeKuttaCashKarp54Integrator with gridConnections is causing errors
Question #695226 on Yade changed: https://answers.launchpad.net/yade/+question/695226 Status: Open => Answered Janek Kozicki proposed the following answer: See: https://gitlab.com/yade-dev/trunk/-/issues/171 it is not fixed. You can try the workaround mentioned in that issue, use flag dead=True. -- 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 #695226]: RungeKuttaCashKarp54Integrator with gridConnections is causing errors
Question #695226 on Yade changed: https://answers.launchpad.net/yade/+question/695226 Description changed to: Hello, I want to use the RungeKuttaCashKarp54Integrator engine in a simulation with cylinderConnections. I added viscous damping to the source code of Law2_ScGeom6D_CohFrictPhys_CohesionMoment, this caused the NewtonIntegrator to be unstable (The objects are exploding). I concluded this may be because of the integration scheme and opted to use RungeKuttaCashKarp54Integrator. However when I try to run the simulation with RungeKuttaCashKarp54Integrator, I get "RuntimeError: No IGeomDispatcher in engines or inside InteractionLoop". The minimum working code is given below. Please help me to fix the issue Kind regards, Rohit John ## # encoding: utf-8 "An example showing bending beams." from yade.gridpfacet import * Parameter L=10. # length of the beam n=12# number of nodes used to generate the beam r=L/50. # radius of the beam element Engines integrator=RungeKuttaCashKarp54Integrator([ ForceResetter(), GeneralIntegratorInsertionSortCollider([Bo1_GridConnection_Aabb()]), InteractionLoop( [Ig2_GridNode_GridNode_GridNodeGeom6D()], [Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=True,setCohesionOnNewContacts=False)], [Law2_ScGeom6D_CohFrictPhys_CohesionMoment()] ), GravityEngine(gravity=Vector3(0,0,-9.81)), ]) #Tolerances can be set for the optimum accuracy integrator.rel_err=1e-6; integrator.abs_err=1e-6; O.engines=[integrator, ] Create materials and set different properties O.materials.append(CohFrictMat(young=1e6,poisson=0.3,density=1e1,frictionAngle=radians(10),normalCohesion=1e40,shearCohesion=1e40,momentRotationLaw=True,label='mat1')) Vertices vertices1=[] for i in range(0,n): vertices1.append( [i*L/n,0,0] ) Create cylinder connections nodesIds=[] cylIds=[] cylinderConnection(vertices1,r,nodesIds,cylIds,color=[1,0,0],highlight=False,intMaterial='mat1') Set boundary conditions for i in range(0,1): O.bodies[nodesIds[i*n]].dynamic=False Set a time step O.dt=1e-05 Allows to reload the simulation O.saveTmp() -- 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 #695226]: RungeKuttaCashKarp54Integrator with gridConnections is causing errors
New question #695226 on Yade: https://answers.launchpad.net/yade/+question/695226 Hello, I want to use the RungeKuttaCashKarp54Integrator engine in a simulation with cylinderConnections. I added damping to the source code of Law2_ScGeom6D_CohFrictPhys_CohesionMoment, this caused the NewtonIntegrator to be unstable (The objects are exploding). I concluded this may be because of the integration scheme and opted to use RungeKuttaCashKarp54Integrator. However when I try to run the simulation with RungeKuttaCashKarp54Integrator, I get "RuntimeError: No IGeomDispatcher in engines or inside InteractionLoop". The minimum working code is given below. Please help me to fix the issue Kind regards, Rohit John ## # encoding: utf-8 "An example showing bending beams." from yade.gridpfacet import * Parameter L=10. # length of the beam n=12# number of nodes used to generate the beam r=L/50. # radius of the beam element Engines integrator=RungeKuttaCashKarp54Integrator([ ForceResetter(), GeneralIntegratorInsertionSortCollider([Bo1_GridConnection_Aabb()]), InteractionLoop( [Ig2_GridNode_GridNode_GridNodeGeom6D()], [Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=True,setCohesionOnNewContacts=False)], [Law2_ScGeom6D_CohFrictPhys_CohesionMoment()] ), GravityEngine(gravity=Vector3(0,0,-9.81)), ]) #Tolerances can be set for the optimum accuracy integrator.rel_err=1e-6; integrator.abs_err=1e-6; O.engines=[integrator, ] Create materials and set different properties O.materials.append(CohFrictMat(young=1e6,poisson=0.3,density=1e1,frictionAngle=radians(10),normalCohesion=1e40,shearCohesion=1e40,momentRotationLaw=True,label='mat1')) Vertices vertices1=[] for i in range(0,n): vertices1.append( [i*L/n,0,0] ) Create cylinder connections nodesIds=[] cylIds=[] cylinderConnection(vertices1,r,nodesIds,cylIds,color=[1,0,0],highlight=False,intMaterial='mat1') Set boundary conditions for i in range(0,1): O.bodies[nodesIds[i*n]].dynamic=False Set a time step O.dt=1e-05 Allows to reload the simulation O.saveTmp() -- 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 #694548]: Unexpected PFacet Collision Physics
Question #694548 on Yade changed: https://answers.launchpad.net/yade/+question/694548 Status: Open => Expired Launchpad Janitor expired the question: This question was expired because it remained in the 'Open' state without activity for the last 15 days. -- 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 #695058]: Bending beams mass computation
Question #695058 on Yade changed: https://answers.launchpad.net/yade/+question/695058 Status: Answered => Open Paul Pircher is still having a problem: Hello, thanks for you thoughts and sorry for the late reply. I tried several things to see how the mass is computed. It turns out there might be even more confusion. If only nodes are added to the simulation, none of them have any mass at all (0.0kg). As soon as CylinderConnections are added the nodes and the cylinders receive a mass, that is "incorrectly" computed as shown above. The point that they overlap is a good one. This might be the reason for a higher mass in the simulation, but as you already have shown this doesn't lead to a valid result either. I found a paper that deals with those connections in yade [1]. In there it is told that "The mass of the cylinder element is lumped into its two nodes." Which would explain the higher masses of the nodes, but on the other hand would mean that the cylinders don't have any mass at all. Did I intrepret that correctly? Is the paper acutally refering to this exact yade-functions or did they use something else? Since they used nodes and cylinder connections I thought this might be the same approach. Would you mind sharing your thoughts on that? Thanks for your help and best regards, Paul [1] https://www.researchgate.net/publication/282996677_A_general_method_for_modelling_deformable_structures_in_DEM -- 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 #695192]: wall.append(O.bodies.append(pfacet) in triaxial test
Question #695192 on Yade changed: https://answers.launchpad.net/yade/+question/695192 Status: Answered => Open Hanying Zhang is still having a problem: >Sure of that? Any example script? Just replace PFacet code with: walls=aabbWalls([mi,ma],thickness=0,material='walls') wallIds=O.bodies.append(walls) (try script below) >I would expect 4 nodes / 2 facets for a rectangle, but whatever the numbers you can clump them all together in one body, hence the nodes won't be repeated. 4 nodes / 2 facets for a rectangle. a box has 8 vertices and 6 sides(12 Pfacets). hence 8 nodes would be repeated? Can I just add force on Pfacets? Thanks! # #run and you can see cylinders go through wall like there is not a wall from yade.gridpfacet import * from yade import pack, plot #from random import random as r import numpy as np from numpy import * import math from yade import utils, qt import random from yade import polyhedra_utils, qt #parameters #mi,ma = (-100e-3,-100e-3,-200e-3),(100e-3,100e-3,200e-3) mi,ma = (-10e-3,-10e-3,-20e-3),(10e-3,10e-3,20e-3) color=[0.,1.,1.] Parameter young=4.0e6 poisson=3 density=1e3 stabilityThreshold=0.01 #=meterials O.materials.append(FrictMat(young=4.0e6,poisson=.3,frictionAngle=30,density=2630e0,label='sphereMat'))#for sphere O.materials.append(FrictMat(young=3e9,poisson=.15,frictionAngle=20,density=910e+0,label='extcylMat'))#for sphere-cylinder O.materials.append(CohFrictMat(young=3e9,poisson=.15,density=910e0,frictionAngle=20,normalCohesion=1e40,shearCohesion=1e40,momentRotationLaw=True,label='intcylMat'))#for cylinder-cylinder O.materials.append( CohFrictMat( young=3e6,poisson=0.15,density=910e0,frictionAngle=20,normalCohesion=3e100,shearCohesion=3e100,momentRotationLaw=True,label='gridNodeMat' ) )#for gridNodes #O.materials.append(CohFrictMat(young=3e9,poisson=.15,density=910e6,frictionAngle=20,normalCohesion=1e40,shearCohesion=1e40,momentRotationLaw=True,label='gridNodeMat'))#for gridNodes O.materials.append(FrictMat(young=4e6,poisson=0.3,density=1000,frictionAngle=20,label='pFacetMat')) #for pfacet O.materials.append(FrictMat(young=young,poisson=0.5,frictionAngle=0,density=2630,label='walls')) triax=TriaxialStressController( maxMultiplier=1.+2e4/young, # spheres growing factor (fast growth) finalMaxMultiplier=1.+2e3/young, # spheres growing factor (slow growth) thickness = 0, stressMask = 0, max_vel = 3.7e-7, wall_front_activated=True, wall_back_activated=True, wall_top_activated=True, wall_bottom_activated=True, wall_left_activated=True, wall_right_activated=True, internalCompaction=False, # If true the confining pressure is generated by growing particles ) #==Engines= O.engines=[ ForceResetter(), InsertionSortCollider([ Bo1_Sphere_Aabb(), Bo1_GridConnection_Aabb(), Bo1_PFacet_Aabb(), Bo1_Box_Aabb(), Bo1_Wall_Aabb() ]), InteractionLoop([ Ig2_Sphere_Sphere_ScGeom(), Ig2_Box_Sphere_ScGeom(), Ig2_GridNode_GridNode_GridNodeGeom6D(), Ig2_Sphere_GridConnection_ScGridCoGeom(), Ig2_GridConnection_GridConnection_GridCoGridCoGeom(), Ig2_GridConnection_PFacet_ScGeom(), Ig2_PFacet_PFacet_ScGeom(), Ig2_Sphere_PFacet_ScGridCoGeom(), Ig2_Wall_PFacet_ScGeom(), Ig2_Wall_Sphere_ScGeom() ], [ Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=True,setCohesionOnNewContacts=False), # internal cylinder physics Ip2_FrictMat_FrictMat_FrictPhys(), # physics for external interactions, i.e., cylinder-cylinder, sphere-sphere, cylinder-sphere Ip2_FrictMat_CpmMat_FrictPhys(), ], [ Law2_ScGeom_FrictPhys_CundallStrack(), # contact law for sphere-sphere Law2_ScGridCoGeom_FrictPhys_CundallStrack(),# contact law for cylinder-sphere Law2_ScGeom6D_CohFrictPhys_CohesionMoment(),# contact law for "internal" cylinder forces Law2_GridCoGridCoGeom_FrictPhys_CundallStrack(),# contact law for cylinder-cylinder interaction #Law2_GridCoGridCoGeom_CohFrictPhys_CundallStrack(), Law2_ScGeom_CpmPhys_Cpm(), ] ), GlobalStiffnessTimeStepper(timestepSafetyCoefficient=0.1,label='ts'), triax, NewtonIntegrator(gravity=(0,0,20),damping=0.5,label='newton'), ] triax.goal1=triax.goal2=triax.goal3=-0.9 walls=aabbWalls([mi,ma],thickness=0,material='walls') wallIds=O.bodies.append(walls) #=
