[MITgcm-support] On the set up of the OBCS volume conservation in a regional simulation with curvilinear grid

[whale]

Dear friends,
 
I am a little confused by the setting of volume conservation in a regional simulation. 
 
I had set up a regional model in Prydz Bay based on the spherical grid (usingSphericalPolarGrid=.TRUE.,). By following the suggestion in historical emails, the volume conservation can be set as follows:
 
V*DRF*DXG*hFacS；U*DRF*DYG*hFacW; Here, the volume calculated by these flux at the OBCS should be 0 to keep the volume conservation;
 
Now, I want to set up a regional model based on the curvilinear grid (usingCurvilinearGrid=.TRUE.). As I see, the velocity in the curvilinear grid are rotated by the AngleCS/SN.data files. So, I am a little confused with what should I do with the velocity field applied at the OBCS. Should I rotate the velocity fields applied at the OBCS to keep the volume conservation in a curvilinear grid simulation. Or, Should I just apply the velocity filed as what I had did in the spherical grid simulation, and the model can adjust the velocity fields by itself.
 
Cheers
 
Chengyan
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