yade-users team mailing list archive

[chiara modenese <c.modenese@xxxxxxxxx>]

On 20 April 2010 16:23, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx> wrote:

>
>  Say that the second contact law uses different IPhys and IGeom than the
>> previous one, in this case it seems perhaps not possible..
>>
> It could be done. For instance, you could loop on all interactions of type
> 1, delete them and replace them with interactions of type 2.
> It would need to define explicitely the conversion rule from attributes 1
> to attributes 2 (in cpp, python, it would be difficult via simple xml
> edit/search/remplace).
>
>  (whatever, in python or modifying html). Ok, if it is not possible I see
>> to find a different solution.
>> BTW, so in our simulation is it possible to have more than one contact
>> law? Can we dispatch between them?
>>
> Not sure what you mean.
> 1st case (best guess) : more than one law for the same body pair. Yade is
> not really designed for that, but it is possible to have two interaction
> laws at the same time between the same two bodies (see capillary law). It
> needs to include all parameters needed by the two laws in one unique
> interaction physics (CapillaryPhys inherits from FrictPhys and add capillary
> parameters, it is used by both Law2_ScGeom_FrictPhys_Basic and
> Law2_ScGeom_CapillaryPhys_Capillarity).
> You could do the same for your problem I think.
>

Ok, thanks for explanation. At this point it is better for me to have a hard
look to how capillary files work.

>
> 2nd case : If there is only one law between each pair, then using many
> contact law is straightforward. Say you have bodies with material types A
> and B in the simulation, dispatchers will first generate AAPhys, BBPhys, or
> ABPhys depending on the materials in each pair. Then dipatcher will look for
> Ip2_geom_AA_, Ip2_geom_BB_, or Ip2_geom_AB_. All you need is define each of
> the functors (there is no example of an "AB" phys in Yade yet but I don't
> think anything prevent that).
>

Got it, although I do not need this for the moment.
Cheers

>
>
> Bruno
>
>
>
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