[MITgcm-support] oscillating mean flow

[Mark Inall]

Hi,
Thanks Jody and thanks Samar. 

Samar, I think you just have an oscillating flow with zero mean - is that right? I wasn't too clear in my posting, but I want to try to add a non-zero mean flow on top of the oscillating component.

Jody, I tried adding a constant mean flow at the boundaries. This worked fine with f=0: the non-zero U BCs propagated into the domain at the barotropic phase speed. But with rotation, the imposed U-momentum wants to rotate, and then there's a mismatch between the N and S boundaries (at least that's what I think happens) ... that's why I wondered about imposing a cross slice pressure gradient (or moving to a channel with walls) - but I'm not sure how to do that ....

Mark.

>>> Samar Khatiwala <spk at ldeo.columbia.edu> 10 June 2010 16:00 >>>
Hi Mark,

Yes, this has been done many times, for e.g., see here: http://www.ldeo.columbia.edu/~spk/Papers/KhatiwalaInternalTidesDSR03.pdf 

This is a bit dated, but I know others have implemented it in more recent versions of the code.

Samar

On Jun 10, 2010, at 10:16 AM, Mark Inall wrote:

> Hi,
> 
> Does anyone have experience with setting up an oscillating mean flow - either in 2D or in a narrow channel - with rotation?
> 
> Presently I'm running an oscillating flow over a bump based on the internal wave verification setup, and I want to add a mean flow - is the best way to impose a barotropic pressure gradient across the section and wait for a geostrophic balance??
> 
> Any thoughts/help much appreciated.
> 
> Thanks,
> 
> Mark.
> 
> 
> 
> 
> Dr Mark Inall
> Reader in Marine Physics
> Scottish Association for Marine Science
> Scottish Marine Institute
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