[MITgcm-support] Side Drag in a narrow canal

[Martin Losch]

Hi Eli,

- the sideDragFactor is 2 by default (when no_slip_sides = .TRUE.), which mean “no slip". A value of 1 means “half-slip”, see description in PARAMS.h
- as far as I know, a drag law as in bottom_drag is not implemented, but it shouldn’t be too hard for you to do so, using the bottom drag as an example. The only complication is that mom_u/v_sidedrag are not called if no_slip_sides=.false., so you need to set no_slip_sides =.TRUE. and sideDragFactor = 0. (free slip) to call these routines and then you can add the required code in the correct if-block.

Martin


> On 14 Jun 2016, at 11:17, אלי ביטון <elib.ocean at gmail.com> wrote:
> 
> Hello there
> 
> I'm running simulations of a narrow  and relatively long canal, in which the drag with sidewalls could be important for the dynamics. In my data file I'm using no_slip_side = TRUE and the sideDragFactor=1 and the horizontal resolution is 20 m across and 100 m along the canal.
> I have two short questions: One - is sideDragFactor could get values between 0-1 (I guess it is, but just to be sure). Additionally,  is there a recommended value for 'sideDragFactor'. Two - I wounder if there are other options to imply friction/drag with sidewalls  (similar to the frictional drag exerted by the bottom for example).  
> 
> Many thanks in advance for your help
> Eli   
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support