[MITgcm-support] Grid nesting method!

[Gianmaria Sannino]

Hi Van Thinh (and mitgcm_support for others who may be interested in 
grid-refinement/nesting).



I'm working on the grid-refinement in MITgcm. Actually the grid-refinement 
technique is different from the nesting procedure you described in your 
e-mail. The grid-refinement supposes to couple the two grids at run-time and 
not off-line; moreover, in the case of a two-way grid-refinement, also the 
finer grid affects the coarse grid model results. What I've developed is a 
new pkg that enable two mitgcms (the coarse grid model and the fine grid 
model) to be coupled during the two models integration. The coupling is 
realized thanks to MPI and an external parallel driver that computes, in a 
first step, the OBCs to apply at the fine model (velocity, salinity, 
temperature and surface elevation) and, in a second step, the volume 
averaged dynamic variables from the fine to the coarse model. Of course this 
is a very simple description of what the pkg & driver do.



The pkg on the mitgcm CVS is not updated, and anyway the driver is missing.

At moment I've no time to generalize the pkg and driver, so I don't think to 
update the pkg on the CVS very soon.



Anyway, if you want I can describe to you - in detail - how the refinement 
works and how you could implement it in the mitgcm, but of course I need 
more details about your experiment.



ciao

gianmaria







----- Original Message ----- 
From: "Van Thinh Nguyen" <vtnguyen at moisie2.math.uwaterloo.ca>
To: <mitgcm-support at mitgcm.org>
Sent: Wednesday, January 17, 2007 5:11 PM
Subject: [MITgcm-support] Grid nesting method!


> Dear all,
>
> Can we apply a grid nesting method in MITgcm? I mean if I firstly can run 
> a model on a coarse grid then refine the grid at a location, and use the 
> results from last run as a input for the refined domain.
>
> If anyone may know about how to implement this approach in MITgcm, please 
> give a hint.
>
> Thanks a lot!
>
> Van Thinh --------------------------------------
>
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