[MITgcm-support] error with "tmin,tmax" exceeds allowed range

[Jody Klymak]

This happens because the model is going unstable (i.e. the CFL criteria is exceeded).  Reduce your timestep, coarsen your grid, and make sure your hfac is not too small. This will make small dz values near topography that can easily exceed CFL if you have strong vertical velocities in your problem.

Cheers,  Jody

On Dec 12, 2013, at  10:49 AM, 李志远 <oceanlizy at 163.com> wrote:

> From: lizhiyuan <oceanlizy at 163.com>
> To: mitgcm-support at mitgcm.org
> Subject: error with "tmin,tmax" exceeds allowed range 
> 
> 
> Hi, there;
>     I  use mitgcm to simulate the wind driven circulation in a semi-closed domain ,  I compile passed,but when run the model ,after some steps , errors occured :
>         SOLUTION IS HEADING OUT OF BOUNDS : tMin,tMax= -4.697E+04   6.872E+03
>             exceeds allowed range (monsolutionmaxrange=1.000E+03)
>       ending the run 
> my SIZE.h file is as below :    sNx=268,
>                                              sNy=338,
>                                              oLx=3,
>                                              oLy=3,
>                                              nSx=1,
>                                              nSy=1,
>                                              nPx=1,
>                                              nPy=1,
>                                              Nr=36,
> my data file :         
>                            viscAr  =1.E-3,
>                            viscAh=4.E5,
>                           diffKhT=1000,
>                            diffKrT=3.E-5,
>                            diffKhS=4.E2,
>                            diffKrS=3.E-5,
>                           rhoConst=1035.,
>                           rhoConstFresh=1000.,
>                           f0=1.e-4,
>                           no_slip_sides=.FALSE.,
>                           no_slip_bottom=.TRUE.,
>                           rigidLid=.FALSE.,
>                           implicitFreeSurface=.TRUE.,
>                           eosType = 'LINEAR',
>                          implicitDiffusion=.TRUE.,
>                           implicitviscosity=.TRUE.,
>                           hFacMin=0.1,
>                           readBinaryPrec=32,
>   I wonder why it always occur such errors that  the" tmin,tmax"  exceed the allowed range ,  the only two parameters related to  temperature  are "diffKhT ,diffKrT",  I think it is  the two parameters value set in the "data"file that caused such  errors.  should I  change the two values ?  what I should do to avoid such errors ?
> 
> many thanks!
> 
> 
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