[CIG-SEISMO] Topography simulation : numerical instability

[Alan Schiemenz]

Thanks everyone for the replies that the links were broken.  They appear
to be fixed now.

Velocity snapshot:
https://www.geophysik.uni-muenchen.de/~schiemenz/topo_examples.jpg

CUBIT file :

https://www.geophysik.uni-muenchen.de/~schiemenz/gauss_500_166_red3.cub


Alan


Alan Schiemenz wrote:

> Dear SPECFEM3D users,
> I am having problems running simulations with a mountain topography. 
> The simulation is unstable despite taking time steps much smaller than
> the CFL limit would require.  Furthermore, the numerical instabilities
> are originating at the corners of the model, whereas the source is
> located in the center.   The link below contains velocity snapshots of
> two different topographies at the point where instability is obvious. 
> On the left is a rough topography whereas on the right is a smooth
> topography :
> https://www.geophysik.uni-muenchen.de/~schiemenz/topo_examples.jpg
>
> In case we are doing something incorrect CUBIT, I also have the
> following .cub file for the smooth topography case.
> https://www.geophysik.uni-muenchen.de/~schiemenz/gauss_500_166_red3.cub
>
> Thank you for your help,
> Alan Schiemenz
> _______________________________________________
> CIG-SEISMO mailing list
> CIG-SEISMO at geodynamics.org
> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo
>