[MITgcm-support] restart simulations using pickup files

[kaveh Purkiani]

Dear Martin,

Thank you for your reply, I still did not get what you mean.

Here is the parameter of the first simulation
&PARM03
 nIter0=0
 baseTime=0.,
 startTime=0.,
 endTime=86400,
 deltaT=12,
 abEps=0.1,
 momDissip_In_AB=.FALSE.,
 pChkptFreq=0,
 chkptFreq=86400,
 dumpFreq=7200,
 monitorSelect=2,
 monitorFreq=100.,
 periodicExternalForcing=.TRUE.,
 externForcingPeriod=7200.,
 externForcingCycle =2505600.,
 &

and here is the data file for restarting the model
&PARM03
 nIter0=7200, ----> 86400/12
 baseTime=0.,
 startTime=0.,
 endTime=86400,
 deltaT=12,
 abEps=0.1,
 momDissip_In_AB=.FALSE.,
 pChkptFreq=0,
 chkptFreq=86400,
 dumpFreq=7200,
 monitorSelect=2,
 monitorFreq=100.,
 periodicExternalForcing=.TRUE.,
 externForcingPeriod=7200.,
 externForcingCycle =2505600.,
 &

The only change I did is nIter0 from 0 to 7200

regards,
Kaveh


On Mon, Dec 3, 2018 at 4:36 PM Martin Losch <Martin.Losch at awi.de> wrote:

> HI Kaveh,
>
> as you found out yourself, the model gets confused about the forcing. I
> think that this is so, because you set baseTime and StartTime=0 which is in
> conflict with nIter0=7200.
> Assuming you don’t change the time step between pickups, all you should
> change is nIter0.
>
> Martin
>
> > On 3. Dec 2018, at 14:34, kaveh Purkiani <kavehpurkiani at googlemail.com>
> wrote:
> >
> > Hi,
> > I am trying to run a simulation (with a total length of 2 days) using a
> restart file after the first day. The model is forced laterally by U, V,
> Temp and Salt.
> > The only modifications I did are renaming the pickup files and changing
> the nIter0 to the proper number to be able to start the simulation of the
> second day. The model works well with no error message but, the results are
> surprising to me.
> > In the attached figure, two simulations for v component velocity for the
> same location are shown (red: with restart and black: normal run without
> restarting). On the first day, they are identical and they should continue
> the same but, the red line (run using restart files) starts deviating right
> after applying the pickup files.
> > From comparing the simulations it seems to me that model reads the
> pickup file properly, but the forcing is different.
> > Similar differences are seen in other properties e.g., Temp, Sal and U
> component.
> >
> > I've done different tests to figure out where does this error come from
> but no success.
> > Here is the PARAM3 in the data and everything else remains exactly
> similar for these two simulations!
> >
> >  &PARM03
> >  nIter0=7200, ----> 86400/12
> >  baseTime=0.,
> >  startTime=0.,
> >  endTime=86400,
> >  deltaT=12,
> >  abEps=0.1,
> >  momDissip_In_AB=.FALSE.,
> >  pChkptFreq=0,
> >  chkptFreq=86400,
> >  dumpFreq=7200,
> >  monitorSelect=2,
> >  monitorFreq=100.,
> >  periodicExternalForcing=.TRUE.,
> >  externForcingPeriod=7200.,
> >  externForcingCycle =2505600.,
> >  &
> >
> > Any help is really appreciated.
> > Kaveh
> >
> >
> >
> >
> > <Restart.pdf>_______________________________________________
> > MITgcm-support mailing list
> > MITgcm-support at mitgcm.org
> > http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support
>
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>
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