[CIG-SHORT] attenuation in a dynamic model?

[Brad Aagaard]

Eunseo,

Attenuation for dynamic models is not yet implemented. This has been on
the TODO list for a while but many other features have been a higher
priority.

If you try to use a viscoelastic model with a high viscosity, then you 
will likely need to reduce the time step. I am guessing that the 
instability you see is starting at a cell that is slightly more 
distorted so it has a smaller stable time step.

Regards,
Brad

On 08/06/2015 09:17 AM, Eunseo Choi (echoi2) wrote:
> Can PyLith have attenuation in an explicit dynamic problem?
>
> I couldn't find how to do this anywhere in the v.2.1.0 manual.
>
>
> So, I first tried MaxwellIsotropic3D expecting the relaxation effect
> to do the job but even with a very high viscosity, an instability
> kicks in around the boundary where a time-dependent traction BC is
> applied. Maybe this material model works only in static or
> quasi-static problems? Or is it more likely to be a mistake in my
> problem setup?
>
>
> I also read in PyLith's TO-DO list that the plan is to use the
> generalized Maxwell model for attenuation. Is this the material model
> I was supposed to use? Is it working in v.2.1.0 but just not being
> discussed in the manual?
>
>
> Thanks,
>
> Eunseo
>
>
>
>
>
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