[MITgcm-support] Controlling C-grid grid mode

[David Ferreira]

Christopher,
Griffies and Hallberg (2000, MWR) has a few guidelines on how to choose 
viscosities and how to relate harmonic to biharmonic viscosities (at 
least the "A4 = 0.125 Ah dx^2" relationship is explained in there). Many 
of the material seen in mom_calc_visc.F also comes from that paper.
david



On 8/10/11 2:28 PM, Christopher L. Wolfe wrote:
> Hi all,
>
> I'm trying to figure out what the state of the art is in controlling 
> the C-grid grid mode associated with the Coriolis term on coarse grids 
> (~1 deg). Alistair came up with the CD scheme to control this grid 
> mode, but it appears to have fallen out of favor since it dissipates 
> an unknown amount of kinetic energy. I've heard people recommend 
> biharmonic viscosity, but I'm not sure what an optimal value of the 
> viscosity should be. There's a note in mom_calc_visc.F that recommends 
> A4 = 0.125 Ah dx^2 … do the list members feel that this is a good 
> value? What other schemes do people use to control this grid mode?
>
> Thanks,
> Christopher
>
>
> -----------------------------------------------------------
> Dr. Christopher L. Wolfe    858-534-4560
> Climate, Atmospheric Science, and Physical Oceanography
> Scripps Institution of Oceanography, UCSD clwolfe at ucsd.edu 
> <mailto:clwolfe at ucsd.edu>
> -----------------------------------------------------------
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>
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