yade-users team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Hi Chiara,

Nice pinpointing. I'll try and have a look as soon as I have time. Maybe 
I just forgot to update some wall-sphere code when I added energy 
tracing in the sphere-sphere part.

Cheers.

Bruno

On 20/08/10 16:58, chiara modenese wrote:
> Hi,
>
> OK I found where is the problem. Please see the two attached figures 
> (for people interested in the topic see the previous post in this 
> thread). In one case I include friction between balls and boxes, in 
> the other only between balls. Energy is conserved even if the 
> simulation is _dynamic_ (good news), the problem is present only if 
> there is friction between balls and boxes. Please I need your help to 
> understand if this is a bug.
>
> So question for everyone:
> What is the difference in terms of computation of the shear behavior 
> between a box-sphere interaction and a sphere-sphere interaction?
>
> Thanks a lot.
>
> Chiara
>
>
>
> On 12 July 2010 17:26, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx 
> <mailto:bruno.chareyre@xxxxxxxxxxx>> wrote:
>
>
>     Chiara, I found a problem in the script you use for comparing
>     energies in bouncing spheres.
>     The line O.materials[0].frictionAngle=radians(25) is changing
>     value in the material but it is not reflecting everything
>     automaticaly in interactions (tangent of friction is still 0 in
>     the contact law, but radians(25) is used for computing energy, so...).
>     By using
>     TriaxialCompressionEngine().setContactProperties(radians(25))
>     instead, I get something better. Total energy is still increasing,
>     but at least it will stagnate at a point.
>
>     Bruno
>
>
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--
_______________
Bruno Chareyre
Associate Professor
ENSE³ - Grenoble INP
Lab. 3SR
BP 53 - 38041, Grenoble cedex 9 - France
Tél : +33 4 56 52 86 21
Fax : +33 4 76 82 70 43
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