[MITgcm-support] nTimeStep

smaeilpour saeid_gal at yahoo.com
Fri Jun 9 11:38:32 EDT 2017


My data file is as:

 viscAz=1.E-3,
 viscAh=1.E-2,
 no_slip_sides=.FALSE.,
 no_slip_bottom=.TRUE.,
 diffKhT=1.E-2
 diffKzT=1.E-3,
 f0=0.00002,
 beta=2.4228E-11,
 eosType='LINEAR',
 tAlpha=2.E-4,
 sBeta =0.E-4,
 gravity=9.81,
 implicitFreeSurface=.TRUE.,
 exactConserv=.TRUE.
 nonHydrostatic=.FALSE.,
 hFacMin=0.2,
 implicSurfPress=0.5,
 implicDiv2DFlow=0.5,
 nonlinFreeSurf=3,
 hFacInf=0.2,
 hFacSup=1.8,
 saltStepping=.TRUE.,

But in STDOUT I have:

(PID.TID 0000.0001) hFacMin =   /* minimum partial cell factor (hFac) */
(PID.TID 0000.0001)                 2.000000000000000E-01
(PID.TID 0000.0001)     ;
(PID.TID 0000.0001) hFacMinDr = /* minimum partial cell thickness ( m) */
(PID.TID 0000.0001)                 0.000000000000000E+00

after a while of run:

EXTERNAL_FIELDS_LOAD,      1850 : iP,iLd,i0,i1=   12    1   12    1 ; Wght=  0.4964313272  0.5035686728
 cg2d: Sum(rhs),rhsMax =  NaN                   Infinity             
 EXTERNAL_FIELDS_LOAD,      1851 : iP,iLd,i0,i1=   12    1   12    1 ; Wght=  0.4964293981  0.5035706019
 cg2d: Sum(rhs),rhsMax =  NaN                    0.00000000000000E+00


Cheers,
Saeid







--------------------------------------------
On Fri, 6/9/17, Jody Klymak <jklymak at uvic.ca> wrote:

 Subject: Re: [MITgcm-support] nTimeStep
 To: mitgcm-support at mitgcm.org
 Date: Friday, June 9, 2017, 11:09 AM
 
 
 What did STDOUT say?  What is
 your value of hFac min?
 Cheers,  Jody
 
 On 9 Jun 2017, at 8:02, smaeilpour
 wrote:
 Thank you Jody,
 
 I restarted with a deltaT=5, that is small as following:
 
 
 
 startTime=0,
 
 endTime=86400,
 
 deltaT=5,
 
 
 
 but Model after a while (about 1500 of nTimeStep) becomes
 unstable, what solution else do you offer except that? and
 what CFL criteria else should i consider for it?
 
 
 
 Thank you again,
 
 Saeid
 
 
 
 
 
 
 
 --------------------------------------------
 
 On Wed, 6/7/17, Jody Klymak <jklymak at uvic.ca>
 wrote:
 
 
 
  Subject: Re: [MITgcm-support] nTimeStep
 
  To: mitgcm-support at mitgcm.org
 
  Date: Wednesday, June 7, 2017, 12:26 PM
 
 
 
 
 
 
 
  9 times out of 10 you will get this if deltaT is too
 
  large.  Look for advcfl_*_max in
 
  STDOUT.0000.  They should be less than one, and
 
  preferably less than 0.5. A couple of things to be aware
 of
 
 
 
 
 
  setting hFacMin to be too
 
  small value can mean your vertical cell is very small,
 and
 
  the CFL
 
  condition becomes impossible to meet.  hFacMin
 
  is the fraction of dR that a cell is allowed to
 
  be near the bottom, so dR=10 m and
 
  hFacMin=0.1 means the cell can be as thin as 1
 
  m. If your deltaT=50 then W
 
  can’t exceed 2 cm/s in that cell.  If the topography
 is
 
  steep that is not a gigantic value for W near
 
  topography.you may have strong start-up
 
  transients in your solution that make the model behave
 more
 
  violently at the start than after it has been allowed to
 
  evolve.  So check STDOUT.0000 and if the CFL
 
  criteria starts to drop again, you may be able to
 restart
 
  with a smaller deltaT.
 
 
 
 
 
  Good luck,  Jody
 
 
 
  On 7 Jun 2017, at 8:35,
 
  smaeilpour wrote:
 
 
 
 
 
  Hi everyone,
 
 
 
  I am trying to run Internal wave, my bathymetry file is
 
  2160*876 and precision 30s. I'd like to run it in 38
 
  layer and by 3500m depth. The Model with nTimeStep=100
 would
 
  be run well but whenever I increase it for more times I
 
  encounter with the following error:
 
 
 
 
 
 
 
  ABNORMAL END: S/R MON_SOLUTION, stops due to EXTREME
 
  Pot.Temp
 
 
 
 
 
 
 
  My error in STDER.0000 is:
 
 
 
  (PID.TID 0000.0001) SOLUTION IS HEADING OUT OF BOUNDS:
 
  tMin,tMax=-1.918+101  1.617+101
 
 
 
  (PID.TID 0000.0001)  exceeds allowed range
 
  (monSolutionMaxRange= 1.000E+03)
 
 
 
  (PID.TID 0000.0001) MON_SOLUTION: STOPPING CALCULATION
 at
 
  Iter=  20
 
 
 
  (PID.TID 0000.0001) ***ERROR***S/R ALL_PROC_DIE: ending
 the
 
  run
 
 
 
 
 
 
 
  Of course, once I used startTime and endTime instead of
 
  nTimeStep but it didn't matter.
 
 
 
 
 
 
 
  My data file is as following:
 
 
 
   nIter0=0,
 
 
 
   nTimeSteps=8640,
 
 
 
   deltaT=50,
 
 
 
   dumpFreq=21600,
 
 
 
   pChkptFreq=0,
 
 
 
   chkptFreq=0,
 
 
 
   monitorFreq=2500.,
 
 
 
   periodicExternalForcing=.TRUE.,
 
 
 
   externForcingPeriod=2592000.,
 
 
 
   externForcingCycle=31104000.,
 
 
 
   tauThetaClimRelax=31104000.,
 
 
 
   abEps=0.02,
 
 
 
   &
 
 
 
 
 
 
 
  Is it possible that my domain is big for internal wave
 
  analysis that I get that error? if not so, how can I fix
 
  this problem? how can I run model for 4 years and more
 with
 
  this situation?
 
 
 
 
 
 
 
  Thank you in advance for any help,
 
 
 
  Saeid
 
 
 
 
 
 
 
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