[MITgcm-support] Can not run a regional model for long time

[Matthew Mazloff]

You need to find out why it is becoming unstable. Have a look at the solution and see if you can see where and why it is blowing up.

Matt


> On Sep 18, 2022, at 6:08 AM, Sabri MUTLU (MAM-ÇTÜE) <sabri.mutlu at tubitak.gov.tr> wrote:
> 
> Hi all,
> 
> As a newbie in this field, I need help for the following problem, which I have been trying to deal with for a long time.
> 
> I built a regional model for my thesis study. When I try to run it for 12 or more days, it gives "NaN" values after 8 or 9 days later in the model. 
> Could you please examine the following model configuration and give me an idea for possible solution?
> 
> (I had to choose Orlanski method since don't have any boundary condition to feed the model.)
> 
> Thank you in advance.
> Sabri
> 
>  &PARM01
>  viscAh=2.E-2,
>  viscAz=1.5E-5,
>  no_slip_sides=.TRUE.,
>  no_slip_bottom=.TRUE.,
>  diffKhT=2.E-2,
>  diffKhS=2.E-2,
>  diffKzT=2.E-5,
>  diffKzS=2.E-5,
>  f0=0.948E-4,
>  implicitFreeSurface=.TRUE.,
>  exactConserv=.TRUE.,
>  implicitDiffusion=.TRUE.,
>  implicitViscosity=.TRUE.,
>  eosType = 'JMD95Z',
>  tRef=22.2803,22.3383,22.3646,22.4220,22.5469,22.5081,21.0406,19.6075,18.3619,16.7902,15.8310,15.4016,15.3625,15.3935,15.4334,15.4465,15.4508,15.4710,15.5226,
>       15.5428,15.5485,15.5589,15.5829,15.5860,15.5859,15.5767,15.5572,15.5477,15.5357,15.5068,15.4782,15.4640,15.4337,15.3816,15.3480,15.2998,15.2423,15.2127,
>       15.1271,15.0639,15.0086,14.9722,14.9229,14.8937,14.8470,14.8073,14.7838,14.7677,14.7392,14.7210,14.7037,14.7036,14.7035,14.7034,14.7033,
>  sRef=24.3775,24.4042,24.4730,24.5782,24.7042,24.8407,25.8279,26.4026,28.0163,30.1542,31.7531,33.9951,37.0132,37.5629,37.8303,37.9592,38.0011,38.1433,38.2744,
>       38.3184,38.3548,38.4269,38.5535,38.6043,38.6738,38.7411,38.7479,38.7496,38.7510,38.7512,38.7469,38.7529,38.7569,38.7644,38.7666,38.7683,38.7698,38.7696,
>       38.7635,38.7563,38.7513,38.7476,38.7427,38.7399,38.7354,38.7326,38.7305,38.7280,38.7254,38.7236,38.7220,38.7220,38.7220,38.7220,38.7220,
>  staggerTimeStep = .TRUE.,
>  tempAdvScheme = 33,
>  saltAdvScheme = 33,
>  useSingleCpuIO=.TRUE.,
>  bottomDragQuadratic = 0.02,
>  select_rStar = 0,
>  &
> 
>  &PARM02
>  cg2dMaxIters=300,
>  cg2dTargetResidual=1.E-13,
>  cg3dMaxIters=20,
>  cg3dTargetResidual=1.E-8,
>  &
> ---------
>  &PARM03
>  startTime  = 0.,
>  endTime = 1036800.,
>  deltaT=5,
>  dumpFreq=10800.,
>  monitorFreq=3600.,
>  monitorSelect=2,
>  periodicExternalForcing=.TRUE.,
>  externForcingPeriod=10800.,
>  externForcingCycle=1036800.,
>  &
> 
>  &PARM04
>  usingSphericalPolarGrid=.TRUE.,
>  delz = 32*2,22*8,10,
>  delX = 528*0.0013,
>  delY = 164*0.001,
>  ygOrigin=40.656,
>  xgOrigin=29.2612,
>  &
> 
>  &PARM05
>  bathyFile='bathy_v6_528-164.bin',
>  zonalWindFile='windU_2309-0510.bin',
>  meridWindFile='windV_2309-0510.bin',
>  &
> 
> # Open-boundaries
>  &OBCS_PARM01
>  OB_Iwest=164*1,
>  useOrlanskiWest=.TRUE.,
>  useOBCSbalance=.TRUE.,
>  useOBCSsponge=.FALSE.,
>  OBCS_balanceFacW = -1.,
>  &
> 
> # Packages
>  &PACKAGES
>  useOBCS=.TRUE.,
>  useKPP =.TRUE.,
>  &
> 
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