[MITgcm-support] problems with OBCS

[Jody Klymak]

Yes, the model is periodic in x and y unless you specify open boundary conditions, or put bathymetry at the boundaries.  

You’d have to give us more information to know why you are generating v values. 

Note that v won’t be identically zero, because of roundoff errors, but it should be infinitesimally small unless you somehow force in the v direction.

Cheers,   Jody

> On May 18, 2017, at  17:56 PM, ? ?? <Peterspy at outlook.com> wrote:
> 
> Dear Jody & Edward,
> I have set an experiment with f = 0 , but v is still not zero. That really confuse me.
> I am wondering how the northern and southern boundaries work in a 2D experiment, as periodic (as Edward says)?
> No forcing is given except boundary tidal forcing (u at east/west boundary) in this experiment.
> Thanks a lot.
> Best,
> Pengyang Song
> 
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 17 May 2017 09:07:11 -0700
> From: Jody Klymak <jklymak at uvic.ca>
> To: mitgcm-support at mitgcm.org
> Subject: Re: [MITgcm-support] problems with OBCS
> Message-ID: <B2BBDA09-B084-4392-A59E-7859FB5A0079 at uvic.ca>
> Content-Type: text/plain; charset="us-ascii"
> 
> And/or set f=0.   
> 
> Note that if you want f not = 0, then you are best to let v have non zero values.
> 
> Cheers,   Jody. 
> 
> 
> 
> Sent from my iPad
> 
>> On May 17, 2017, at 06:47, Edward W Doddridge <ewd at mit.edu> wrote:
>> 
>> Hi Pengyang,
>> 
>> The model is periodic in x and y by default - if you want to have no meridional flow you will need to specify a bathymetry file that has a depth of zero along either the northern or southern boundary.
>> 
>> Best,
>> Ed
>> 
>> 
>> Edward Doddridge
>> Postdoctoral researcher
>> Earth, Atmospheric and Planetary Sciences Massachusetts Institute of 
>> Technology
>> 
>> www.doddridge.me
>> 
>>> On 17 May 2017, at 01:17, ? ?? <Peterspy at outlook.com> wrote:
>>> 
>>> Hello all,
>>> I am currently running a 2 dimensional verification on x-z plane. The open boundary forcing is added on west/east boundary.
>>> But I found that output meridional velocity (v) is not zero, I want to set my north/south boundary both walls based on my experiment requirement.
>>> So I undef ALLOW_OBCS_NORTH and ALLOW_OBCS_SOUTH in OBCS_OPTIONS.h, but it seems not work.
>>> Is there any other settings that I should do?
>>> Thanks in advance.
>>> Best,
>>> Pengyang Song
>>> College of Oceanic and Atmospheric Sciences Ocean University of China 
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>> 
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