[MITgcm-support] Controlling C-grid grid mode
Michael Schaferkotter
schaferk at bellsouth.net
Wed Aug 10 16:46:56 EDT 2011
here/s a MITgcm list link to a discussion which may be of some use:
http://forge.csail.mit.edu/pipermail/mitgcm-support/2003-December/001888.html
biharmonic friction is discussed in the MITgcm manual at
http://mitgcm.org/public/r2_manual/latest/online_documents/node86.html
On Aug 10, 2011, at 1:28 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
> -----------------------------------------------------------
>
>
>
>
>
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