yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Sounds good.
B

On 19/12/13 12:15, Anton Gladky wrote:
> Hi Francois,
>
> I am ok with these changes.
>
> Anton
>
>
> 2013/12/19 François <francois.kneib@xxxxxxxxx>:
>> Hi,
>>
>> I'm currently dealing with handling the contact between a ViscElMat and a
>> FrictMat.
>> To do this, and as I said some days ago, ViscElMat will have a Young Modulus
>> and Stiffnesses. If both are set by the user, young modulus will be ignored
>> (so the actual scripts will still work).
>>
>> I'm wondering about massMultiply. By default it is True and the resulting
>> stiffness of the contact is K=k1*m1*k2*m2/(k1*m1+k2*m2), and the viscous
>> factors are multiplied by the mass too. If the user sets stiffnesses, I
>> understand that the masses comes into consideration when computing the
>> resulting stiffness. But to my mind, if the user sets Young/Poisson, then
>> ki=2*Ei*ri and the "particles shapes" are already taken into account, so we
>> should not use massMultiply. That's not true for the viscous coefficient
>> that should be computed the same way if the user sets stiffnesses or
>> young/poisson.
>>
>> What I propose in the case the user sets young/poisson and massMultiply=true
>> is : don't multiply for the stiffness calculation, but multiply for the
>> viscous coefficients. In addition, by doing this, the behaviour will be the
>> same than for the FrictPhys, which seems essential.
>>
>> Do you agree with this ? Of course, all this modifications will be described
>> in the documentation.
>>
>> François
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Bruno Chareyre
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ENSE³ - Grenoble INP
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