[MITgcm-support] How to set inclined open boundaries

Martin Losch Martin.Losch at awi.de
Wed Dec 18 10:46:35 EST 2024


Hi Fanglou,

if you still want to use the yellow dashed domain, you’ll have to use `usingCurvilinearGrid = .TRUE.,` and provide the grid parameters in a very specific format yourself. The OBCs E,W,N,S then do not correspond to geographical directions but grid directions ( right, left, upper, lower) and verlocities will have to be rotated into the grid direction before putting them into boundary files. There are a few examples that use this kind of configuration.

e.g. https://github.com/MITgcm-contrib/arctic/tree/master/cs_36km uses
#define OLD_GRID_IO in CPP_OPTIONS.h which requires that the grid files are available als LONC.bin, etc. see the readme.txt

Martin



> On 18. Dec 2024, at 15:31, Matthew Mazloff <mmazloff at ucsd.edu> wrote:
> 
> Hello
> 
> With the exch2 package land tiles are not included in the run, so I recommend not rotating the domain. 
> Are you using exch2 - do you need guidance on setting that up?
> 
> Matt
> 
> 
>> On Dec 18, 2024, at 3:01 AM, Fanglou Liao <fanglou.liao at unswalumni.com <mailto:fanglou.liao at unswalumni.com>> wrote:
>> 
>> Dear MITgcm support
>> 
>> I am a new user of MITgcm, and is very interested in developing my own model with MITgcm. I have a basic knowledge on how to build a model covering the domain denoted by the red box (attached), however, I do not know how to build a model like the yellow dash box. For the yellow dash box, the open boundaries are inclined, which confused me on how to set the open boundary conditions, ect.
>> 
>> 
>> Best,
>> 
>> FL
>> 
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