[MITgcm-support] Minimum Viscosities

[David Ferreira]

Ryan,
A few guidelines:
http://mitgcm.org/r2_manual/latest/online_documents/node131.html
david


Christopher L. Wolfe wrote:
>
> Ryan,
>
> If you have zonal boundaries, you need to set viscAh large enough to 
> resolve the Munk boundary layer ~(Ah/beta)^(1/3). I like to have 2-3 
> grid points in the Munk layer. If you don't resolve the Munk layer you 
> can get grid modes in the barotropic streamfunction.
>
> If you use implicit vertical viscosity, I think you can make the 
> vertical viscosity as small as you want it. You might even be able to 
> set it to zero at let numerical viscosity do all the work for you. I'm 
> sure someone will correct me on this if I'm wrong.
>
> Cheers,
> Christopher
>
> -----------------------------------------------------------
> Dr. Christopher L. Wolfe                   858-534-4560
> Physical Oceanography Research Division    OAR 357
> Scripps Institution of Oceanography, UCSD  clwolfe at ucsd.edu
> -----------------------------------------------------------
>
>
>
>
> On Jul 1, 2009, at 2:23 PM, Ryan Abernathey wrote:
>
>> Hello MITgcm People,
>>
>> Is there a general rule for determining what the *minimum* possible
>> horizontal and vertical viscosities (viscAh & viscAr) should be for a
>> given configuration?
>>
>> Or do you just have to experiment until you find settings that are
>> stable?
>>
>> Thanks again,
>> __________________
>> Ryan Abernathey
>> rpa at mit.edu
>> MIT Ph.D. Student
>> Program in Oceans Atmospheres & Climate
>> http://web.mit.edu/rpa/
>>
>>
>>
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