[MITgcm-support] is Orlanski radiation condition working in the rotating rank of MITgcm?

[Jean-Michel Campin]

Hi Martin and Yi-Chih,

To Martin: This feature has been introduced around 2011, and was mentioned
by Angela Zalucha here:
http://mailman.mitgcm.org/pipermail/mitgcm-support/2012-April/007725.html
So the answer to the original question is: yes.

To Yi-Chih: How does this work ? 

a) You need to set "radius_fromHorizGrid"
  to the radius of the sphere that matches the grid-files you provide.
  Since all the grid-files that are around have been set-up for Earth,
  this is very-likely you will have to set it to the Earth  radius,
  like in this "data" file:
 https://github.com/MITgcm/MITgcm/blob/master/verification/tutorial_held_suarez_cs/input/data

b) And then you need to set rSphere to the radius of the planet you are
  simulating. The model will scale the length and area accordingly.

Cheers,
Jean-Michel
      
On Thu, Dec 20, 2018 at 10:15:49AM +0100, Martin Losch wrote:
> I think that I have answered this question:
> 
> > On 19. Dec 2018, at 19:28, Yi-Chih Huang <dscpln at gmail.com> wrote:
> > 
> > Do you think the given rSphere or radius_fromHorizGrid in the data file would change the grid information in CS, LLC, or the curvilinear coordinates when OLD_GRID_IO is set in CPP_OPTIONS.h?
> multiple times with ???NO???. You???ll have to do this yourself (offline).
> 
> M.
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