[MITgcm-support] Problems with OBCS package

[Jody Klymak]

As Matt said, that is almost certainly a CFL criteria violation.  You could make your life a lot easier by allowing the wave to propagate in rather than initialize with so much shear throughout your domain.  That will definitely be hard for the model to deal with for a while until it can dissipate the initial hit.  

Cheers,   Jody

> On 27 Oct 2020, at 08:35, Павел Лобовиков <plobovikov at gmail.com> wrote:
> 
> Hi folks!
> 
> I need to simulate the evolution of the tide in an ocean section with the following topography (picture in attactment).
> 
> I've tried to use the OBCS package for this objective.
> 
> My grid has the following dimensions: (Nx,Ny,Nz) = (2600 x 1 x 384).
> 
> I have a file with a distribution of horizontal speed in time (inside is an array with 1 x 384 x Time dimension).
> 
> My data.obsc file has the following content:
> 
>  &OBCS_PARM01
> # This flag turns off checking and fixing problematic topography across 
> # open boundaries.
>  OBCSfixTopo=.TRUE.,
> 
>  OB_Iwest = 1,
>  OB_Ieast = -1,
>  useOBCSprescribe = .TRUE.,
>  OBWuFile = 'OB_WestU.bin',
>  OBCS_monSelect = 1,
>  &
> 
> But in the end I do not get all what I expect..
> 
> The velocity field immediately filled with sharp jumps (picture in attachment).
> 
> What did I miss and do wrong? 
> 
> My data file in attachment as well.
> 
> 
> Thanks, Pavel!
> <topography.jpg><velocity.jpg><data>_______________________________________________
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--
Jody Klymak    
http://ocean-physics.seos.uvic.ca/~jklymak/






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