[MITgcm-support] documentation about OBC Orlanski and Balance Flow

[Camille Mazoyer]

Hi,
Thank you for your reply Matthew and Martin. I already read the doc 
http://mitgcm.org/public/r2_manual/latest/online_documents/node236.html, 
but I didn't try the examples. I will run these examples very soon. I 
already did google "mitgcm + OBC", and as you said, and I found a lot of 
discussion, but I didn't see yet an explanation of OBC_balance or how 
Orlanski  method is implemented. But, I will search again if some 
discussions can help me.
The Stevens BCs  are currently only implemented for eastern and western 
boundaries no? So if I have 3 boundaries (Eastern, Wester, South), I 
can't use it no? Or can I mixed Orlanski for South boudary and Stevens 
for Eastern and Western?

Thank you,
Camille


Le 29/01/2016 09:31, Martin Losch a écrit :
> Hi Camille,
>
> there is some documentation about the obcs package here: <http://mitgcm.org/public/r2_manual/latest/online_documents/node236.html>
> There is very little about the Orlanski option but at least it points you to some examples (the verification experiments that Matt mentioned).
>
> I often use the Stevens BCs, which are some kind of mixture of prescribe values and a radiation condition. For purely radiative BCs, the Orlanski option is probably the best.
>
> Martin
>
>> On 28 Jan 2016, at 16:52, Camille Mazoyer <mazoyer at univ-tln.fr> wrote:
>>
>> Dear all,
>> I just start using MITgcm as I will use it during my thesis for creating a configuration on the rade de Toulon, France.
>> Currently, I'm trying to understand how open boundary conditions work, with these two steps:
>> - orlanski scheme wich seems to be a predictor step, if I understand well, where we use the pression of the previous step. We calculate velocities, temperature and salinity we will have to correct during the next step
>> - use of balance flow wich seems to be a corrector step of these variables (Is this right?)
>> I only find a few explanations in the doc (mainly explaining the CPP Key). I also have read the paper of Orlanski, 1976.
>> Would you have more documentations / publications about the method used in the MITgcm (orlanski and balance flow)? (about the numerical part, or the method, ...)
>>
>> Thank you very much for your help,
>> Camille Mazoyer
>>
>> -------------------------------
>>
>> Camille Mazoyer
>> Phd Student
>> Mediterranean Institute of Oceanography (MIO)
>> Université de TOULON
>> Bat X - CS 60584
>> 83041 TOULON cedex 9
>> France
>> http://mio.pytheas.univ-amu.fr/
>>
>>
>>
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-- 
------------------------------------------
Camille Mazoyer
Phd Student
Mediterranean Institute of Oceanography (MIO)
Université de TOULON
Bat X - CS 60584
83041 TOULON cedex 9
France
http://mio.pytheas.univ-amu.fr/