[MITgcm-support] heuristics for sponge boundary parameters?

[Nicolas Grisouard]

Hi Michael,

I use settings that have proved to be quite good for internal wave 
problems, I hope it can help.

Say you have a forcing frequency w.
    - number of points: as long as the horizontal wavelength of mode-1 
internal waves of frequency w,
    - [UV]relaxobcsinner = (2*pi/w)/1000,
    - [UV]relaxobcsbound = 2*pi/w.

If you don't have too much of mode-1 internal waves which are the 
hardest to absorb, you can reduce the number of points.

These parameters are quite efficient but the resulting sponges might 
require a lot of points. If people know about less costly setups, I am 
interested also.

Cheers,
Nicolas

Michael Schaferkotter (Contractor) wrote:
> greetings;
>
> i am soliciting remarks on heuristics for choosing the parameters in the sponge boundary configuration.
>
> for example, how wide 'should' the sponge boundary zone be for a domain NNX x NNY ?
>
> what should the ratio of [UV]relaxobcsinner to [UV]relaxobcsbound be?
>
> i/ve tried some experiments and so far the results are not useful.
>
> is there an 'optimal' set of these parameters?
>
> michael
>
> m. r. schaferkotter
>
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-- 
Nicolas GRISOUARD
PhD Student - ERES research group
Laboratoire des Ecoulements Geophysiques et Industriels
BP 53
38041 Grenoble cedex 9 France
tel: +33 (0)476 825 037 - fax: +33 (0)476 827 022
http://nicolas.grisouard.free.fr