[MITgcm-support] Minimum Viscosities

[Ryan Abernathey]

David & Chris,

Thanks a lot for your suggestions. This makes sense. And that manual  
page is a very good resource--lots of information and explanations. I  
wish I had found it sooner!

Cheers,
Ryan

On Jul 1, 2009, at 7:29 PM, David Ferreira wrote:

> 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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