[MITgcm-support] OBCs over topography!

[Matthew Mazloff]

Hi Van Thinh,

I actually think either would be fine.  I believe the masks will 
over-rule the obcs-prescribe so that if you prescribe a T,S,U,V where 
there is land the model will not be effected.
Please let me know if you find otherwise.

-Matt



Van Thinh Nguyen wrote:

>Hi Matt,
>
> Instead of:
>     OB_Ieast=80*-1
>     OB_Iwest=80*1
>
> I should write:  OB_Ieast=0, 78*-1, 0
>                  OB_Iwest=0, 78*1, 0
>
> Is that what you meaned?
>
> Thanks
>
> Van Thinh
>
>On Thu, 20 Oct 2005, Matthew Mazloff wrote:
>
>  
>
>>Hi Van Thinh!
>>
>>You can give all cells and the masks will take care of it.  (e.g.
>>OB_Ieast=80*-1,OB_Iwest=80*1 is fine)
>>
>>Other things I have learned:
>>1) You should make the topogrophy flat right at the obcs.  (e.g. make
>>the height at (i,j) = (i+1,j) for the western boundary)
>>2) Do not use the CD scheme with obcs
>>
>>-Matt
>>
>>
>>Van Thinh Nguyen wrote:
>>
>>    
>>
>>>Hi
>>>
>>>I'm confused how to set up the boundary condition at a OB where a
>>>topography intersects with the grid block (please see my figure enclosed).
>>>I would like to simulate internal waves due to a tidal flow over a
>>>depression Gaussian bump in a channel, which has OBCs at West and East,
>>>North & South are closed sides. It looks like the geometry in exp4, the
>>>difference is only the bump (my case is depression bump!).
>>>Model is 3D, but the Fig. enclosed is a (X,Z) section at middle of bump.
>>>
>>>At West/East OBs, topography intersects grid block at cell 55 (Z direction
>>>with 80 cells). It means:
>>>
>>>- from free surface to cell 55 is OB
>>>- from cell 55 to the bottom is closed
>>>
>>>In this case, should I define cells (1-55) are OBCs in data.obcs or I can
>>>define all cells at West/East are OBCs (with OB_Ieast=80*-1,
>>>OB_Iwest=80*1)
>>>
>>>
>>>Could someone please give a hint for this?
>>>
>>>Thanks so much!
>>>
>>>Van Thinh
>>>
>>>------------------------------------------------------------------------
>>>
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>>>      
>>>
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