[MITgcm-support] [EXTERNAL] OBCS add_tide does not change open boundary velocities

[Matthew Mazloff]

Agree with Dimitris. Specifically I would try adding:

   useOBCStides = .TRUE.,

in data.obcs


Matt


> On Feb 26, 2021, at 4:34 AM, Dimitris Menemenlis <menemenlis at jpl.nasa.gov> wrote:
> 
> Hi Penyang, as a penance , I am trying to answer before your esteemed AWI colleague
> but I don’t see anything wrong with the set-up that you describe below.
> 
> I wonder if it would help to try and use as many of the options from
> MITgcm/verification/seaice_obcs/code
> MITgcm/verification/seaice_obcs/input.tides
> initially, less the sea ice, to see if that fixes problem.
> And then you can progress back, in steps, to your set-up.
> 
> D.
> 
> 
>> On Feb 26, 2021, at 1:08 AM, SONG Pengyang <Peterspy at outlook.com <mailto:Peterspy at outlook.com>> wrote:
>> 
>> Dear MITgcm developers,
>> I am trying to setup an idealized 2D experiment with obcs package (e.g, Nx*Ny*Nr=500*1*30).
>> The idea is that I want to give a tidal component through the west bound as OBWAmFile (Am=0.1m/s) and OBWPhFile (Ph=0).
>> What I changed to codes are:
>> (1)    “#define ALLOW_OBCS_TIDES” in OBCS_OPTIONS.h
>> (2)    “tidalComponents = 1” in OBCS_PARAMS.h
>> (3)    “#define NONLIN_FRSURF” in CPP_OPTIONS.h
>> Data.obcs:
>> ‘’’
>> &OBCS_PARM01
>> OB_Ieast=-1,
>> OB_Iwest=1,
>> OBWAmFile='OBWAm.bin',
>> OBWPhFile='OBWPh.bin',
>> tidalPeriod=43200.0,
>> &
>> ‘’’
>> However, tidal signals are not found in the model result and the west and east two colomns of u are constant zeros.
>> No errors regarding to the I/O are reported, so I think the files I input are correct.
>> Is there any other changes I should do to the obcs? I.e., should I add sponge layer at the west bound and Orlansky condition at the east?
>> Kind regards,
>> Pengyang
>>  
>>  
>> ----------------------------------------------------------------
>> SONG Pengyang（宋朋洋）
>> PhD candidate in Paleoclimate Dynamics
>> Department of Climate Sciences
>> Alfred Wegener Institute,
>> Helmholtz Centre for Polar and Marine Research
>> Address: Bussestr. 24, 27570 Bremerhaven, Germany
>> Tel: (+49) 471 4831 1811
>> Mobile: (+49) 17667211481 (DE)
>>              (+86) 15762264643 (CN)
>>  
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