[MITgcm-support] External forcing for deltaT < 1 sec

[Dustin Carroll]

Hi Zhenhua,

Thats a good, creative suggestion — I’ll try the forced-inflow and forced-outflow case.

Thanks,
Dustin
 

On Apr 11, 2014, at 7:04 PM, linzhenhua <linzhenhua at 163.com> wrote:

> Hi, 
> 
> The parameters seem fine to me. I do not know what you plan to model with this two-dimensional configuration, as you use Orlanski in the west boundary, forced flow at the east boundary, perhaps these obc values are altered internally since you have also enabled OBCSbalance.
> 
> As a step to validate the model should work with small time step, I advise you first try a forced-inflow and forced-outflow case. If the velocity field in your OBEU_hr.bin file is time dependent, could you first try this file as both easy and west obc condition to check whether you could get the consistent time-dependent velocity field?
> 
> 
> 
> 
> --
> Zhenhua Lin
> Key Laboratory of Ocean Circulation and Waves (KLOCAW)
> Institute of Oceanology
> Chinese Academy of Sciences
> Nanhai Road 7
> Qingdao 266071
> PR China
> 
> At 2014-04-12 09:35:28,"Dustin Carroll" <dcarroll at uoregon.edu> wrote:
> Hi,
> 
> Thanks for getting back to me, good to know that it should work. I have only used the periodicExternalForcing for wind stress before so perhaps I am setting it up wrong with OBCS. 
> 
> Here is how I am setting it up in data for forcing hourly for 30 days.
> 
>  periodicExternalForcing=.TRUE.,
>  externForcingPeriod=3600.,
>  externForcingCycle=2592000.,
> 
> Here is my data.obcs file, the bin files contain 720 records (2592000/3600).
> 
> # ***************
> # Open boundaries
> # ***************
>  &OBCS_PARM01
>  OB_Iwest  =   1*1,
>  OB_Ieast  =   1*-1,
>  useOBCSprescribe=.TRUE.,
>  useOrlanskiWest=.TRUE.,
>  useOBCSbalance=.TRUE.,
> 
>  OBEtFile='OBET_hr.bin',
>  OBEsFile='OBES_hr.bin',
>  OBEuFile='OBEU_hr.bin'
> 
>  OBWtFile='OBWT_hr.bin',
>  OBWsFile='OBWS_hr.bin',
> 
>  OBCS_monitorFreq= 3600.,
>  OBCS_monSelect = 3,
>  &
> 
>  &OBCS_PARM02
>  &
> 
> Just want to check I’m setting this up right — perhaps I am missing a flag somewhere. Everything is running properly with a static BC setup.
> 
> Best,
> Dustin
> 
> 
> 
> On Apr 11, 2014, at 6:20 PM, linzhenhua <linzhenhua at 163.com> wrote:
> 
>> Hi  Dustin,
>> I have used this method for high resolution simulation forced with obc, and the results seem reasonable for me. The time step in my configuration is 0.5s.
>> 
>> 
>> 
>> At 2014-04-12 04:09:57,"Dustin Carroll" <dcarroll at uoregon.edu> wrote:
>> >Hi All,
>> >
>> >I am running some high-resolution experiments where the time step is < 1 second and I need to have time dependent boundary conditions. 
>> >
>> >Normally I use EXF for this, but for these experiments I can’t because the cal pkg doesn’t support deltaT < 1. 
>> >
>> >I tried using the basic periodicExternalForcing but that didn’t properly loop through my forcing files properly when deltaT < 1. Can anyone confirm that periodicExternalForcing works with deltaT < 1 or recommend a method for time dependent bc's with these small time steps?
>> >
>> >Thanks,
>> >Dustin 
>> >
>> >
>> >
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>> 
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> 
> 
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