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[Jan Stránský <question270178@xxxxxxxxxxxxxxxxxxxxx>]

Question #270178 on Yade changed:
https://answers.launchpad.net/yade/+question/270178

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi Seti,
there might be several reasons. In your script, the unbalanced force check
is never called. Do you use the same script, or you comment/uncomment
something while running? Please next time attach exactly the same script
with which you have problem and also delete unnecessary comments (not used
commands etc., half of your script :-), it will be then more readable and
clear where the problem might be..
Thanks in advance for more information
Jan


2015-08-10 8:07 GMT+02:00 Seti <question270178@xxxxxxxxxxxxxxxxxxxxx>:

> New question #270178 on Yade:
> https://answers.launchpad.net/yade/+question/270178
>
> Hi all,
>
> I trust all is well. I am just trying to do very simple simulation(
> felling down grains because of their weight).
>
> I have two questions. The first one is regarding stopping conditions : I
> have used the unbalancedForce to imply this condition, I do not know which
> is correct or not, if yes why the program does not stop of running although
> after several hours it seems the grains do not move.
>
> The other question is about the text file which I have used to save the
> results, when I want to use it , I face with the error which is mentioned "
> the file you opened has some invalid characters"
>
> Maybe these questions are so simple to answer but I could not find the
> solutions. Make me glad if you help with these.
>
> Thanks so much
>
> Seti
>
> Here is the script:
> #!/usr/bin/python
> from yade import pack,utils#, qt
> pred = pack.inAlignedBox((0,0,0),(20,200,20))
> #create material
> soil1 =
> CohFrictMat(young=1e10,poisson=0.2,frictionAngle=radians(15),density=2500.0,normalCohesion=1e6,
> shearCohesion=80e6,label='soil')
> #color=(1,0,0) ----red color
> #soil1 =
> FrictMat(young=1e6,poisson=0.4,frictionAngle=radians(30),density=2500.0,label='soil')
> O.materials.append(soil1)
> O.bodies.append(utils.wall(0,axis=1,sense=1))
> O.materials.append(CohFrictMat(young=1e9,poisson=0.1, frictionAngle =
> radians(15) , label='wallmat'))
> wallmat = O.materials[-1]
>
> spheres=SpherePack()
>
> spheres=pack.randomDensePack(pred,radius=1.1,material='soil',spheresInCell=1000,color=(1,0,0),returnSpherePack=True)
> spheres.toSimulation()
> #O.bodies.append(spheres)
> #
>
>
> #
> O.engines=[
>              ForceResetter(),#reset forces
>              InsertionSortCollider([Bo1_Wall_Aabb(),Bo1_Sphere_Aabb()]),
>              InteractionLoop(
>
> [Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Wall_Sphere_ScGeom()], # collision
> geometry
>                             [Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()],
> # collision "physics"
>
> [Law2_ScGeom6D_CohFrictPhys_CohesionMoment(),Law2_ScGeom_FrictPhys_CundallStrack()]
> # contact law -- apply forces
>                                             ),
>                       # apply gravity force to particles
>                             # damping: numerical dissipation of energy
>
> NewtonIntegrator(damping=0.5,gravity=(0,-9.81,0)),
>
> #qt.SnapshotEngine(fileBase='3d-',iterPeriod=200,label='snapshot'),
>    # this engine will be called after 20000 steps, only once
>                             #PyRunner(command='finish()',iterPeriod=20000)
> ]
>
> # set timestep to a fraction of the critical timestep
> # the fraction is very small, so that the simulation is not too fast
> # and the motion can be observed
> O.dt=1*utils.PWaveTimeStep()
> #makeVideo(snapshot.snapshots,'3d.mpeg',fps=10,bps=10000)
> # save the simulation, so that it can be reloaded later, for
> experimentation
> #O.saveTmp()
> def checkUnbalanced():
>    if unbalancedForce()<10:
>       O.pause()
> #plot.saveDataTxt('modi.data.bz2')
>       # plot.saveGnuplot('bbb') is also possible
>
> # collect history of data which will be plotted
> def addPlotData():
>    # each item is given a names, by which it can be the unsed in plot.plots
>    # the **O.energy converts dictionary-like O.energy to plot.addData
> arguments
>    plot.addData(i=O.iter,unbalanced=unbalancedForce(),**O.energy)
> O.save('Modified.data.bz2')
>
> #O.save('confinedState'+key+'.yade.gz')
> from yade import qt
> qt.View()
> #O.run()
> #from yade import qt
> #qt.View()
> #O.run()
> # this function is called when the simulation is finished
> #def finish():
>    # snapshot is label of qt.SnapshotEngine
>    # the 'snapshots' attribute contains list of all saved files
>    #makeVideo(snapshot.snapshots,'3d.mpeg',fps=10,bps=10000)
>    #O.pause()
>
> # set parameters of the renderer, to show network chains rather than
> particles
> # these settings are accessible from the Controller window, on the second
> tab ("Display") as well
> #rr=yade.qt.Renderer()
> #rr.shape=False
> #rr.intrPhys=True
>
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