[MITgcm-support] BC's for flow in a box

[David Hebert]

Hi Martin,

Thanks for the update. I do want a sponge layer for U/V. One thing I am 
having trouble finding in the code is does this require specifying 
boundary velocities of zero via OBWufile, OBWvfile, etc? or by setting 
indices via OB_I and OB_J does the model set boundary to zero unless 
otherwise specified with OBCS prescribe?

Thanks,

David

Martin Losch wrote:
> David,
> closed boundaries with a sponge layer for for T/S are straight forward 
> with the RBCS package, velocities are not affected by this package, 
> using this package is quite straightforward.
>
> If you want a sponge layer for U/V, then you need to use OBCS and you 
> need to put your boundaries inside the domain, that is at 1,nx, and 
> 1,ny (OB_Jsouth=nx*1, OB_Jnorth=nx*-1, OB_Iwest=ny*1, OB_Ieast=ny*-1) 
> and then use the parameters OBCSuseSponge, U/Vrelaxinner/bound
>
> Martin
>
> On Feb 24, 2009, at 3:07 AM, David Hebert wrote:
>
>> I would like to simulate a flow similar to an experimental setup of 
>> stratified fluid in a tank. In this configuration I would like to 
>> specify "closed" boundaries with a sponge layer. In order to do this, 
>> do I need to use OBCS prescribe to specify zero U,V at the boundaries 
>> (and corresponding T,S)? Or is it possible (and easier) by not 
>> specifying any open boundary indicies (that is, specify 
>> OB_Jnorth=nx*0, OB_Iwest=ny*0, etc.).
>>
>> Thanks,
>>
>>
>> David
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