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

[Martin Losch]

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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