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[Jan Stránský <question280376@xxxxxxxxxxxxxxxxxxxxx>]

Question #280376 on Yade changed:
https://answers.launchpad.net/yade/+question/280376

Jan Stránský proposed the following answer:
Hi Mohsen,


> 1-  I want to generate an 'elastic' body (so rigid bonds and clump idea
> are not useful) with arbitrary shape such that:
>     i- it's surface should be smooth, to provide such feature i thought
> may be arranging spheres with prescribed  overlap (but with no force) could
> be the answer. is this OK? if yes how to apply it in YADE? if not , is
> there a better suggestion?

   ii- As the shape is arbitrary (suppose a 2D potato) and i need a
> realistic response of the body, i have decided to fill the inside of potato
> with spheres with overlap but no force generated ( like previous part of my
> question); any better idea? if this is OK, what is modelling consideration
> (any comment about  forces, moments, contact law and ...)?


>

As suggested by Jerome, some contact models allow this feature. I use
CpmMat for this purpose. Overlaping spheres may be used if such surface is
sufficiently smooth for you. I am curious myself, so I will create a simple
example and post it here :-) how many such potatoes would you like to
simulate?


2- In new version of Yade, is it possible to capture polygon collision?
>

There are polyhedra implemented, including collision detection and one
material law (repulsive force is proportional to overlapping volume).
Polygons can be simulated as prisms.


>
> 3- Can i model a flexible membrane in Yade? Is there any new findings
> after zuoguang's question [1]?
>

It is not possible in Yade currently. You have to combine Yade with other
software or use different software, like Woodem (suggested by Vaclav in
referenced question)

cheers
Jan

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