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[Jan Stránský <question284341@xxxxxxxxxxxxxxxxxxxxx>]

Question #284341 on Yade changed:
https://answers.launchpad.net/yade/+question/284341

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi Behzad,

is it possible to create two interactions, one
with CohBurgersMat-CohBurgersMat, the other "the same", but
CohBurgersMat-CohBurgersMat and check its phys and geom properties to see
if / how they are different? What about damping parameters? The system with
damping might be stable for larger time step than non-damped system..

If rotational speed goes unstable and decreasing time step helps (guessing
from the end of your email), than the stiffness related to rotational
motion is too high for original time step. How do you compute the time step
in your case?

cheers
Jan


2016-02-01 23:21 GMT+01:00 behzad <question284341@xxxxxxxxxxxxxxxxxxxxx>:

> New question #284341 on Yade:
> https://answers.launchpad.net/yade/+question/284341
>
> Hey guys,
>
> I have interactions of two different materials in my model.
> The first material is CohFrictMat. and the second one is CohBurgersMat
> which has viscoelastic properties and is a subclass of CohFrictMat.
>
> The contacts of these two materials are handled by
> Ip2_CohFrictMat_CohBurgersMat_CohBurgersPhys.
>
>
> But, the problem is whenever we have this interaction in the model, the
> bodies rotational velocities go unstable and I need to reduce the DOFs by
> blocking the rotational DOFs.
>
> Is there any other way to treat this problem without blocking the
> rotational DOFs or using small time-steps?
>
> Can I do something on the contact model?
>
> Thanks.
>
>
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