[MITgcm-support] Enforcing Dirichlet BCs

[Nicolas Grisouard]

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
Courant Institute of Mathematical Sciences
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