[CIG-SEISMO] SpecFem3D Cartesian Boundary conditions

[Dimitri Komatitsch]

Hi,

In such finite-element methods if you do nothing you get a free surface 
(Neumann traction-free surface, i.e. traction is zero at the surface), 
which is perfectly reflecting.

If you want a Dirichlet rigid condition (displacement equal to zero), 
which is also perfectly reflecting, let me know; that is not implemented 
because never used in seismology, but if needed it is easy to implement.

Best regards,
Dimitri.

On 02/12/2016 02:08 PM, Liberman, Vladimir - 0881 - MITLL wrote:
> Looking through the manual, all I see for choices of boundary conditions
> on the bottom and the sides of the simulation are : 1) Absorbing and 2)
> CPML.
>
> Is it possible to enable a simple “fixed” (i.e., reflecting) boundary?
>
> Thanks,
>
> V. Liberman
>
> Staff  Member, Chemical, Microsystem, and Nanoscale Technologies Group
> MIT Lincoln Laboratory               E-mail: vlad at ll.mit.edu
> <mailto:vlad at ll.mit.edu>
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> http://www.ll.mit.edu/mission/electronics/cmnt/bios/liberman-v.html
>
>
>
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-- 
Dimitri Komatitsch
CNRS Research Director (DR CNRS), Laboratory of Mechanics and Acoustics,
UPR 7051, Marseille, France    http://komatitsch.free.fr