[MITgcm-support] Adjoins advection schemes

[Christopher L. P. Wolfe]

Thanks Patrick,

TAF choked on OS7MP, but DST3 seems to be working well for the moment.

Cheers,
Christopher

On Jul 2, 2012, at 6:41 AM, Patrick Heimbach wrote:

> 
> Christopher,
> 
> our scheme of choice for the adjoint has become
> 3rd-order direct space and time DST3 in non-flux limited form, i.e. scheme 30.
> DST3FL (33) causes problems for certain applications, and we haven't followed up on this
> (the obvious issue being how the limiters are formulated).
> 
> SOM is very memory-consuming, so we've staid away from this one for the adjoint
> (which amplifies memory-consumption).
> 
> OS7MP is also currently disabled but might be worth a try
> (would need some tweak though before it can be attempted).
> 
> -Patrick
> 
> On Jul 2, 2012, at 3:58 AM, Martin Losch wrote:
> 
>> Christopher, 
>> 
>> the easiest way to find out is to have a look at gad_advection or gad_calc_rhs (the calls to GAD_*_ADV_X/Y). You'll see that most schemes "work" (i.e., they are allowed to be used) but in particular OS7MP (and I think SOM) doesn't work. From my experience I recommend using linear advection schemes (which rules out all flux limited schemes) for more accurate gradients.  
>> 
>> Martin
>> 
>> On Jun 29, 2012, at 10:25 PM, Christopher L. P. Wolfe wrote:
>> 
>>> Hi all,
>>> 
>>> Does anyone know if there exists a list of advection schemes which are known to "work" with adjoint? I'm particular interested in the higher order schemes like OS7MP and SOM and their flux limited forms. 
>>> 
>>> Thanks in advance,
>>> Christopher
>>> 
>>> 
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>> 
>> 
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> ---
> Patrick Heimbach | heimbach at mit.edu | http://www.mit.edu/~heimbach
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