[MITgcm-support] STOP MOM_IMPLICIT_R: error when solving 3-Diag problem.

[Gus Correa]

Hi Kunal

To try to nail down where, when, why it fails you could compile in
debugging mode,
ie. start fresh ('make CLEAN' in the build directory or just wipe that
directory off)
and run gemake2 with the -devel flag (keep the other flags).
Then, to increase verbosity add:
debugLevel = 4,
to the "data" namelist &PARM01,
and increase the
monitorFreq
in &PARM03
to one or a few time steps.
The STDOUT.XXXX, and STDERR.XXXX files
may give a hint of what is going on (when, where, wny it fails).

I hope this helps,
Gus Correa

On Sat, Sep 12, 2020 at 7:38 PM kunal madkaiker <kunal.madkaiker02 at gmail.com>
wrote:

> Dear All,
>
> I am trying to simulate U,V currents circulation along the West Coast of
> India.
> I have a grid of 720 x 1560 with a high resolution of 1.45km x 1.45km,
> with 25 levels in the vertical from 0 to 2150m. I have set hFacMin=0.3 and
> hFacMinDz=10
>
> But model blows up at the initial stage and I get the error:
> Note: The following floating-point exceptions are signalling:
> IEEE_INVALID_FLAG IEEE_DIVIDE_BY_ZERO IEEE_UNDERFLOW_FLAG
> STOP MOM_IMPLICIT_R: error when solving 3-Diag problem.
>
> I have tried changing viscAh from 1 to 1000 m2/s and viscAz from 0.02 to
> 0.001 m2/s. Also tried with viscAhgrid=0.1.
> I have defined the vertical levels keeping delZ(k+1)/delZ(k) < 1.4 ratio
> in mind. But the issue persists. Kindly advise.
> Please let me know if any additional information is required from my side.
>
> Regards
> Kunal
>
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