[MITgcm-support] Help with CG2D settings

[Christopher L. Wolfe]

Dimitris,

I am using a rigid lid. Won't setting implicitFreeSurface=.TRUE. 
conflict with the rigid lid?

If using the implicit free surface reduces the CG iteration count as 
much as you say, I might be willing to relax the rigid lid. My 
understanding is that the implicit free surface "deals" with surface 
gravity waves by damping them instead of filtering them. Can I switch 
to an implicit free surface without having to reduce the time step to 
accommodate the surface gravity waves?

Christopher

-----------------------------------------------------------
Dr. Christopher L. Wolfe             		 858-534-4560
Physical Oceanography Research Division    OAR 357
Scripps Institution of Oceanography, UCSD  clwolfe at ucsd.edu
-----------------------------------------------------------

On Apr 3, 2007, at 11:33 AM, Dimitris Menemenlis wrote:

> Christopher, you should use
>
>  implicitFreeSurface=.TRUE.,
>
> This will considerably reduce solver iteration for a given accuracy.
> After first few time steps, iterations should not exceed order 100 for 
> 1e-7 residual.
>
> Dimitris
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