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

[SONG Pengyang]

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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