yade-users team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Hi Liqing,

I'm running your script without gravity engine and I don't see any problem.
Note that dt is excessively small, it could be 10x larger without
problem. You don't have to worry about that dt if you use GSTimeStepper
(commented in your current script).

Bruno

On 16/02/12 12:20, Liqing Jiao wrote:
> Dear Bruno,
>
> I am sorry, I don't know how to work on bzr version. Could you help
> me? Which version is bzr version? Thank you very much. Looking forward
> to your reply.
>
> Cheers, Liqing
>
> At 2012-02-02 18:40:16,"Bruno Chareyre" <bruno.chareyre@xxxxxxxxxxx>
> wrote:
>
>     Dear Liqing,
>
>     All examples scripts of triaxial simulations are working correctly
>     without a gravity engine. So, you must have another problem that
>     the gravity engine is only hiding.
>     In order to help users in such cases, we need working scripts
>     generally, not just parts of them.
>     The other problem here is you are developing your own contact law,
>     which makes it impossible to test your scripts currently. We can't
>     help in this situation.
>     If it is improving something, you could consider working on the
>     bzr version and integrate your law in the source code after some
>     review from us.
>
>     Bruno
>
>     On 02/02/12 09:29, Liqing Jiao wrote:
>>     Dear Anton,
>>
>>     Thank you very much for your warm help. My engine file is
>>     following. But I organized the new Ip2, and Law2 files which are
>>     modified based on Luc's model. As for triax, that is
>>     "ThreeDTriaxialEngine". Without GravityEngine, I can't run it. It
>>     doesn't work. But, including GravityEngine, it can work. If I set
>>     the three parameters in GravityEngine to be zero, it also can't
>>     work. I wish that the information I post here is enough. Thank
>>     you very much.
>>
>>     O.engines=[
>>         ParallelEngine([
>>          ForceResetter(),
>>          BoundDispatcher([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
>>         InsertionSortCollider(),]),
>>         InteractionLoop(
>>            
>>     [Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=1.25),Ig2_Box_Sphere_ScGeom()],
>>             [Ip2_LpmMat_LpmMat_LpmPhys()],
>>             [Law2_ScGeom_LpmPhys_LPlasPM()]
>>         ),
>>         #GlobalStiffnessTimeStepper(),
>>         triax,
>>         # you can add TriaxialStateRecorder and such here…
>>         #PyRunner(iterPeriod=1,command='lateral()',initRun=False),
>>         GravityEngine(gravity=(0,0,-0.1)),
>>         #GravityEngine(gravity=(0,0,9.9)),
>>         NewtonIntegrator(damping=.4),
>>         ]
>>
>>     Cheers, Liqing
>>
>>     At 2012-01-28 14:42:39,"Anton Gladky" <gladky.anton@xxxxxxxxx> wrote:
>>     >Hi,
>>     >
>>     >just do not add GravityEngine. Please, attach the problem-script to
>>     >give a more precise answer.
>>     >
>>     >Anton
>>     >
>>     >
>>     >
>>     >2012/1/28 Liqing Jiao <jiaoliqing@xxxxxxxx>:
>>     >>  Dear All,
>>     >>
>>     >> I want to simulate a compression test without gravity effect. But I found I
>>     >> can't run it. If I add the gravity engine, then It can run. Could you please
>>     >> help me to solve this problem? Thank you in advance.
>>     >>
>>     >> Cheers, Liqing
>>     >>
>>     >>
>>     >>
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>>
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>
>     -- 
>     _______________
>     Bruno Chareyre
>     Associate Professor
>     ENSE³ - Grenoble INP
>     11, rue des Mathématiques
>     BP 46
>     38402 St Martin d'Hères, France
>     Tél : +33 4 56 52 86 21
>     Fax : +33 4 76 82 70 43
>     ________________
>
>
>


-- 
_______________
Bruno Chareyre
Associate Professor
ENSE³ - Grenoble INP
11, rue des Mathématiques
BP 46
38402 St Martin d'Hères, France
Tél : +33 4 56 52 86 21
Fax : +33 4 76 82 70 43
________________