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

[Dimitris Menemenlis]

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> 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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