[MITgcm-support] The criteria of cg3dMaxIters

[Saeid Esmaeilpour]

Jody,
my model is about The simulation of currents Circulation from surface to
depth in indian Ocean,  and I selected  nonHydrostatic=.TRUE., cause I
think the model resolve the Nonlinear terms with nonHydrastatic=True (am I
wrong ?).  If I select nonHydrastatic=True, in this case how much should I
set for cg3MaxIters? and If select nonHydrastatic=False, how much for that?
basically for the simulation of currents Circulation and at 2-degree I have
to take non Hydraustatic=false?

Thanks again,
    Saeid

On Tue, Aug 15, 2017 at 11:59 AM, Jody Klymak <jklymak at uvic.ca> wrote:

> Hi Saied,
>
> cg3dMaxIters is only used if nonHydrostatic=.True.. You aren’t resolving
> any non-hydrostatic physics at 2-degree resolution, so I would suggest
> setting nonHydrostatic=.False. Your model runs will be *much* faster.
>
> Cheers, Jody
>
> On 15 Aug 2017, at 8:43, Saeid Esmaeilpour wrote:
>
> Hi Dear users,
> could someone please explain to me what are the following PARM02?
> when I increase cg3dMaxIters from 50 to 400 (e.g,. cg3dMaxIters=400) the
> run speed becomes very slowly. how can I select this value? what's the
> criteria for selecting this number? My domain is 510*210 with 20layer and
> also my resolution is 2 degree (3704m).
>
> # Elliptic solver parameters
> &PARM02
> cg2dMaxIters=1000,
> cg2dTargetResidual=1.E-13,
> cg3dMaxIters=400,
> cg3dTargetResidual=1.E-13,
>
> Thanks for any help,
> Saeid
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