yade-dev team mailing list archive

[chiara modenese <c.modenese@xxxxxxxxx>]

On 22 June 2010 11:18, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx> wrote:

> If one body is not dynamic, is there a reason to define an "equivalent"
> mass? I would say it this case m=m1, which is what Sergei find for infinite
> mass too.
>
Yes, sure in fact my question is still valid. Can I say that into the
contact law? I mean, that if one of the two contact bodies is non-dynamic,
then assign the mass equal to the one of the dynamic body..

>
> Bruno
>
> chiara modenese a écrit :
>
>>
>>
>> On 21 June 2010 06:58, Sergei D. <sj2001@xxxxxxxxx <mailto:
>> sj2001@xxxxxxxxx>> wrote:
>>
>>    .
>>    > Q: I need a sort of equivalent mass to do it, which is something
>>    like
>>    > (as in PFC):
>>    > m=m1*m2/(m1+m2)
>>    > the only thing is that if the contact is between a ball and a
>>    box (say
>>    > in the triaxial) then this would not work. Is it possible in the
>>    contact
>>    > law to discern between bodies shape? Maybe simply pointing to
>>    shape.get()?
>>
>>    Why it will not work?
>>    m=m1*m2/(m1+m2) is 1/m=1/m1+1/m2,
>>    so if box have infinity mass (m2) it will 1/m=1/m1, for example. No?
>>
>> Hi Sergei, it will not work simply because in the TT boxes have zero mass.
>> So in that case it would be necessary to set the equivalent mass equal just
>> to the one of the contact sphere (I think).
>>
>>
>>    --
>>    Best regards,
>>    Sergei D.
>>
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>
>
> --
> _______________
> Bruno Chareyre
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> Grenoble INP
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