[MITgcm-devel] question regarding mom_calc_visc.F

[Jean-Michel Campin]

Hi Dimitri,

>From the "tag-index", looks like few things would have an effect
on our artic set-up:
> o fix bug in mom_v_sidedrag (biharmonic viscosity was counted 2 times);
>   note that biharmonic viscosity + no-slip was not tested in any experiment.
> o fix bug in non-linear free-surf side-drag ; generate new output for
>   global_ocean.cs32x15(+.thsice) & global_ocean_pressure.

- no-slip-side + biharmonic horizontal viscosity (viscA4grid) has
changed (but we may be able to recover the old bugs quiet easily)
- bug in z* & no-slip-side : a fraction of side-drag was applied 
everywhere (even far from any boundary).

Jean-Michel

On Sat, May 06, 2006 at 12:37:43PM -0700, Dimitris Menemenlis wrote:
> Baylor or Jean-Michel, did definition or usage of viscA4Grid change in any 
> way from checkpoint57s_post to checkpoint57t_post?
> 
> I find that configuration MITgcm_contrib/arctic40km suddenly becomes much 
> more noisy when transitioning from checkpoint57s_post to 
> checkpoint57t_post, see attached figure.
> 
> complete data file used is here
> http://mitgcm.org/cgi-bin/viewcvs.cgi/MITgcm_contrib/arctic40km/input/data
> 
> pkg/seaice has been turned off in above test to remove any noise due to sea 
> ice model.
> 
> Dimitris
> 
> P.S. Perhaps related to recent discussion about problem with noise and with 
> ourr inability to run 1/8-deg configuration stably with recent code?


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