[MITgcm-support] addition of selectNHfreeSurf

[Jean-Michel Campin]

Hi David,

The code is not yet checked-in. I have a small test-case
that I am working on and which shows some improvement when
I turn on selectNHfreeSurf, but need to check what it's
doing in other Non-Hydrostatic set-up.
It's mainly intended for cases where the vertical acceleration
at the surface is significant and needs a non-hydrostatic
treatment.
I felt easier to add the flag first so that I can test this new 
feature on several platforms and with different set-up.

I might try soon after to get some of the non-hydrostatic code to 
work with non-linear free-surface, but it's not yet the case.

Cheers,
Jean-Michel

On Mon, Dec 14, 2009 at 01:10:29PM -0600, David Hebert wrote:
> I updated code and In PARAMS.h there is a flag  selectNHfreeSurf. I'm  
> "grepping" around the code and I only see it implemented in ini_parms.F,  
> read_pickup.F, set_params.F, write_pickup.F, but  not in something  
> "dynamical" like update_etah.F. Can someone point me to what the flag  
> does and/or if it is used anywhere else at this time?
>
> As an side, currently I run nonhydrostatic with exactConserv flag and  
> nonlinFreeSurf=0 (since, as I understand it, nonlinFreeSurf can't be  
> anything but 0 with nonhydrostatic).
>
> Thanks,
>
> David
>
> -- 
> David A. Hebert
> Naval Research Lab
> Stennis Space Center, MS 39529
> david.hebert at nrlssc.navy.mil
> Phone: (228) 688-5846

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