[MITgcm-support] CD scheme/OBCS

[Martin Losch]

Hi Holly,

the CD scheme may not be what you want for stability? Did you try using some bi-harmonic viscosity instead?

The CD scheme adds viscosity of unknown size (but depends on the coupling parameter) and is thus hard to control, therefore is it not very popular (even) with its creator.

Martin

On Jan 30, 2012, at 11:29 PM, Jean-Michel Campin wrote:

> Hi Holy,
> Will take a look (but I don't promise anything).
> Cheers,
> Jean-Michel
> 
> On Mon, Jan 30, 2012 at 03:36:31PM -0500, Holly Dail wrote:
>> Hello -
>> 
>> Has anyone implemented the CD scheme with OBCS?  I see comments on this list from Martin from 2006 saying it shouldn't be too hard and giving some hints on what needs to be done.  Has anyone tried it?  Have any advice?
>> 
>> As to where I'm at, I've commented out the stop in OBCS and built the code with both OBCS and cd_code compiled in.  It blows up after about 90 days in my setup, not surprisingly since I haven't made any fixes to the code yet.  My setup is Atlantic basin lat/lon grid at 1 degree with a single open boundary at the southern end.
>> 
>> Thanks in advance for any advice -
>> Holly
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