[MITgcm-support] Numerical diffusion

[Baylor Fox-Kemper]

Lars,
   If you are serious about including the GOTM, you should take a  
look at how KPP is implemented, MITgcm/pkg/kpp
   You may have significant difficulties in incorporating GOTM, as it  
seems that GOTM prescribes fluxes and changes to the mean flow not  
diffusivities/viscosities (which is how the MITgcm receives all  
current parameterizations).  However, I would LOVE to see it  
implemented!
    -Baylor

On Sep 29, 2006, at 7:32 AM, chris hill wrote:

> Lars,
>
>  The centered second order scheme is not diffusive, but it is  
> dispersive!
>
>  There is a section in the online reference manual
>
> http://mitgcm.org/r2_web_testing/latest/online_documents/node85.html
>
> on how ( mostly horizontal ) viscosity is calculated. For vertical  
> mixing there is Large et al KPP code incorporated into the dynamics.
>
>  Martin Losch at AWI was recently thinking about whether to connect  
> to the GOTM suite of schemes. He may have some thoughts on this.  
> Martin also has a nice channel setup that he may be willing to  
> share? He is on this list.
>
> Chris
>
>
> Lars Inge Enstad wrote:
>> Hello
>> I am currently trying to implement an alternative vertical turbulence
>> model in MITgcm (GOTM (General Ocean Turbulence Model Burchard et
>> al.), has this been tried before?). My question is about the  
>> numerical
>> diffusion in the momentum advection scheme in MITgcm. How does this
>> depend on the spatial and temporal discretisation? What is the  
>> momentum
>> advection scheme with the lowest possible numerical diffusion in
>> MITgcm?  One of the test cases I want to verify the code with is  
>> channel
>> flow. In previous models I have used for channel flow, I have used a
>> constant pressure gradient to force the flow. Is there some easy way
>> to set up MITgcm this way?
>> Best Regards
>> Lars Inge Enstad
>
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