[MITgcm-support] rbcs and obcs

[Jody Klymak]

Hi Dustin,

No I've not done this before.  Looking at the code, it looks like it should work, i.e. it just modifies gU and gV.  It does this in EXTERNAL_FORCING so if thats not working then wind stress etc won't work too well either ;-)

There are #ifndef DISABLE_RBCS_MOM pre-processor statements in the rbcs_add_tendency.  So if #define DISABLE_RBCS_MOM is set in RBCS_OPTIONS.h, you will have problems.   You could check your rbcs_add_tendency.f to see if the gU code is in there?

Cheers,  Jody



On Feb 14, 2014, at  13:29 PM, Dustin Carroll <dcarroll at uoregon.edu> wrote:

> Hi Jody,
> 
> Saw your post on the MITgcm-support. I’ve been trying to force velocities using RBCS but still haven't gotten it to work properly. T/S relaxes fine. 
> 
> Have you done this before? — if so do you have a working data.rbcs that you could share? 
> 
> Cheers and thanks,
> Dustin
> 
> On Feb 14, 2014, at 1:18 PM, Jody Klymak <jklymak at uvic.ca> wrote:
> 
>> 
>> Hi all,
>> 
>> I'd like to use rbcs instead of obcs to force internal wave problems, largely because rbcs will allow me to specify a propagating wave inside my sponge, whereas obcs only forces to a single value along the boundary (which can be extended into the interior in a sponge, but not as a propagating wave).
>> 
>> However, I'm curious what will happen if I specify a velocity u next to my boundary and the boundary (either solid or periodic) has zero velocity.  Will that set up a big divergence in the surface height that will cause barotropic waves? 
>> 
>> Do I need to specify those boundaries as open and use obcs to make the conditions match the rbcs conditions?  verification/expt4 seems to do this, so I assume thats the case, but thought I'd ask before spending the time to set both up.
>> 
>> Thanks a lot,  Jody
>> 
>> 
>> --
>> Jody Klymak    
>> http://web.uvic.ca/~jklymak/
>> 
>> 
>> 
>> 
>> 
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--
Jody Klymak    
http://web.uvic.ca/~jklymak/