[MITgcm-support] LES and SMAG_3D?

[Mehmet Ilicak]

Hi Judy,

I think one is still far away from "almost" DNS using those numbers.
I started to implement a quick way of 3D LES to tracer equations 
assuming turbulent Prandtl number is constant,
so one can use Smagorinsky eddy viscosity to eddy diffusivity, but 
please let me know if you beat me to it.

Best,
Mehmet

MI

On 11/22/2014 06:00 PM, mitgcm-support-request at mitgcm.org wrote:
> viscAh=2.E-3,
> viscAz=2.E-3,
> smag3D_coeff = 0.01,
>
> for 1-m resolution
> Hmmm, that's*almost*  DNS depending on your Reynolds number.  And that co-efficient is pretty small, isn't it?  I thought the default Smagorinski was more like 0.1?  But maybe MITgcm normalizes differently.

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