[MITgcm-support] Fwd: boundary conditions and biharmonic damping
Ed Hill
ed at eh3.com
Fri Feb 18 08:05:47 EST 2005
> -------- Forwarded Message --------
> > From: Joseph LaCasce <josephhl at met.no>
> > To: mitgcm-support at mitgcm.org
> > Subject: boundary conditions and biharmonic damping
> > Date: Fri, 18 Feb 2005 13:50:26 +0100
> > Hello! Goran Brostrom has been running some idealized ocean
> > experiments with a square basin and thermal relaxtion at the
> > surface, but without winds (and no salinity). We've noticed
> > the model develops a very sharp temperature gradient next to
> > the eastern wall when using biharmonic mixing for temperature.
> > I looked through the documentation but couldn't find anything
> > specific about the boundary conditions with biharmonic
> > diffusion. But it looks like the sharp gradient (which
> > exists between the wall and the first grid point) is counter
> > to a zero heat flux requirement there. The strong gradient
> > leads to a significant Veronis effect, brought about the
> > biharmonic term (I believe)---you see strong sinking, all
> > the way to the bottom, with upwelling occurring at the next
> > grid point into the interior. Any infor- mation about the
> > lateral boundary conditions would be appreciated! As I
> > understand it, the biharmonic mixing is not rotated (along
> > isopycnals). Is that incorrect? regards---- Joe LaCasce
Hi Joe,
I've subscribed you to the list and forwarded your message.
Hopefully someone else (perhaps Alistair?) will be able to answer your
bc/viscosity question!
Ed
--
Edward H. Hill III, PhD
office: MIT Dept. of EAPS; Rm 54-1424; 77 Massachusetts Ave.
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