[MITgcm-support] rbcs and obcs

[katsman]

I use RBCs to force U, V and - I will send Dustin my data.rbcs file. My 
boundary velocity is zero, so I cannot answer Jody's question.
Caroline


On 02/15/2014 06:00 PM, mitgcm-support-request at mitgcm.org wrote:
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> Today's Topics:
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>     1. rbcs and obcs (Jody Klymak)
>     2. Re: rbcs and obcs (Dustin Carroll)
>     3. Re: rbcs and obcs (Jody Klymak)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 14 Feb 2014 13:18:48 -0800
> From: Jody Klymak <jklymak at uvic.ca>
> To: mitgcm-support at mitgcm.org
> Subject: [MITgcm-support] rbcs and obcs
> Message-ID: <7C2B3494-46B0-44C6-9D3C-1E32800A73DC at uvic.ca>
> Content-Type: text/plain; charset=us-ascii
>
>
> 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/
>
>
>
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 14 Feb 2014 13:29:49 -0800
> From: Dustin Carroll <dcarroll at uoregon.edu>
> To: mitgcm-support at mitgcm.org
> Subject: Re: [MITgcm-support] rbcs and obcs
> Message-ID: <822628F4-56F0-443D-8E0F-DC4ABDC5DA16 at uoregon.edu>
> Content-Type: text/plain; charset=windows-1252
>
> 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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>
>
> ------------------------------
>
> Message: 3
> Date: Fri, 14 Feb 2014 13:39:41 -0800
> From: Jody Klymak <jklymak at uvic.ca>
> To: mitgcm-support at mitgcm.org
> Subject: Re: [MITgcm-support] rbcs and obcs
> Message-ID: <1F6514B8-EE78-4A0F-9B67-89800C1D8788 at uvic.ca>
> Content-Type: text/plain; charset=windows-1252
>
> 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/
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>>
>> _______________________________________________
>> MITgcm-support mailing list
>> MITgcm-support at mitgcm.org
>> http://mitgcm.org/mailman/listinfo/mitgcm-support
> --
> Jody Klymak
> http://web.uvic.ca/~jklymak/
>
>
>
>
>
>
>
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> End of MITgcm-support Digest, Vol 128, Issue 15
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