[MITgcm-support] Specify W velocity with OBCS?

[David Hebert]

Hi Matt,

Thanks for your response. I can see that  a point on a boundary wouldn't 
be solved for since it is specified, but wouldn't it affect the adjacent 
interior point somehow? I probably should note that I am using the model 
in non-hydrostatic mode.

My previous question stems from wanting to specify a jet on the 
boundary. Implementing a "Top Hat" jet on the west boundary using 
OBWuFile seems to work. If I wanted to model a jet with swirl I was 
thinking I would specify all three velocity components on the boundary. 
A Google search for 'MITgcm OBWwFile' gives a few hits, so I thought it 
would be possible to specify vertical velocity on the boundary.  Perhaps 
this was possible in the past? If not, it looks like something I will 
have to add to the code.

As m. schaferkotter noted, the namelist in 
MITgcm/pkg/obcs/obcs_readparms.F does not have any W velocity boundary 
files.

Thanks,

David

Matthew Mazloff wrote:
> Hi David,
>
> I do not believe W (and P) on the open boundary comes into the 
> dynamics.  If W on this point is solved for (and thus given as output) 
> it will be because there is some divergence in the prescribed 
> tangential velocity....but this doesn't effect the interior.
>
> -Matt
>
>
> On Jan 14, 2008, at 11:06 AM, David Hebert wrote:
>
>> All,
>>
>> Is there a way so specify W velocity using OBCS and EXF? When I 
>> specify 'OBWwFile = w.bin' in data.obcs, I get an error saying it is 
>> not found in namelist:
>>
>> PGFIO-F-239/namelist read/unit=11/entity name is not member of group.
>> File name = /tmp/FTNwcP5jg7mUsXg8    formatted, sequential access   
>> record = 17
>> In source file obcs_readparms.f, at line number 1989
>>
>> Thanks,
>>
>> David
>>
>>
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