[MITgcm-support] Enforcing Dirichlet BCs

[David Munday]

Hi Chris,

If you're looking for the type of situation that Nicolas describes, i.e. no flow through the boundary, you might be better off with the rbcs package, as opposed to obcs. There seems to be better documentation/more examples of rbcs, and I found it much easier to set up in the past.

Best wishes,

Dave

On 14 Jun 2012, at 14:48, Nicolas Grisouard wrote:

Hi Chris,

For many practical purposes, "open boundaries" means closed boundaries: it actually means that you prescribe everything on the boundaries where OBCs apply. If you leave all velocities, crossing the boundaries, to zero, then you'll have a closed domain in the sense that water won't flux through them (I hope it's what you meant).

You just have to set the temperatures of your channel boundaries (plus maybe do something about the velocities, parallel to the boundaries and add some sponges as Jody suggested) and you should get what you want.

I hope it helped,
Nicolas.

On 6/14/12 9:25 AM, Chris Horvat wrote:
I'm relatively new to this, so forgive the basic question.

I'm attempting to set up a permanent density gradient in a channel run by fixing the temperature at both sides. I can't quite figure out how to do this, other than the OBCS package, but this is for the open boundary conditions, and mine are definitely closed.

Is there an efficient way of doing this?

C



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Nicolas Grisouard -- Assistant Research Scientist
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Dr. David R. Munday
University of Oxford
Atmospheric, Oceanic, and Planetary Physics
Clarendon Laboratory
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