[MITgcm-support] OBCs over topography!

[Matthew Mazloff]

Actually I would not put OB_Ieast=0, 78*-1, 0,  as I don't think this 
will work properly...i'm not sure what this will do?....did you find it 
does work?

I would use OB_Ieast=80*-1

-Matt


Matthew Mazloff wrote:

> 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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