[MITgcm-devel] low biharmonic viscosity

[Dimitris Menemenlis]

Alistair, as I told you on the phone, by setting
 hFacMin=0.3,

I am able to use
 viscA4Grid = 1e-3,
 viscA4Max  = 2e10,

which I am running right now and which is comparable
to values we used with spherical polar 1/4-deg grid.

For reference, I am appending some figures with location of crash prior
to increasing hFacMin.  It happens at the edge between tiles four and
five.  Also note that there is another extreme W value at the edge
between tile 1 and 5, but three orders of magnitude smaller so that it
is visible only on tile 1.

In both cases (and others that I have seen before) the blow-up occurs
close to sharp bathymetry.  But it's not likely to be a coincidence that
the crash always occurs at the edges.

D. 

-- 
Dimitris Menemenlis <menemenlis at jpl.nasa.gov>
Jet Propulsion Lab, California Insitute of Technology
MS 300-323, 4800 Oak Grove Dr, Pasadena CA 91109-8099
tel: 818-354-1656;  fax: 818-393-6720
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