[MITgcm-support] problems at tile bdys?

[Jean-Michel Campin]

Hi Jody,

Could you send (in a tar file) the directory that contains all the 
modified/customized files you are using (the argument of "genmake2 -mods" command)
as well as all the parameter files (all data* files) for this set-up ?
Also, if you are not using the latest version of MITgcm code, which version 
(checkpointXYz ? or time of the latest "cvs update") are you using ?

It's possible that we can find the problem like this; otherwise, will have 
to try to reproduce it (and in this case will also need the binary input files).

Cheers,
Jean-Michel

On Sat, Jun 15, 2013 at 11:03:30PM -0700, Jody Klymak wrote:
> 
> Hi All,
> 
> I ran a simulation in a 2-D channel but three-D in setup, and all ran fine.  Well except it stayed 2-D because there was nothing to cause there to be spanwise motion.  The simulations are nonhydrostatic.  
> 
> So, I added a very small amount of three d by a few different methods, and everytime, no matter how I set up the three dimensionality (bottom roughness, initial velocities, surface displacements) there would an instability at the same spot in x.  It turns out it is a tile boundary in the middle of the domain.  
> 
> I'm using advection scheme 33, and chnaged OLx and OLy to 5, but still the same problem.  I tried a few other advection schemes, with the same issue (it happens in a hundred or so timesteps, so its easy to debug, at least).  I also tried upping the iterations on the CG3d solver, but that didn't help at all.
> 
> I've now gone back to the same setup I started with, but changed by tile layout (half as many tiles), and the instability is gone.  
> 
> Has anybody run into this?  Any suggestions for a fix or what to look for?  (I guess the stupid fix is not to use that tile configuration, but that seems flakey).
> 
> Thanks,   Jody
> 
> 
> --
> Jody Klymak    
> http://web.uvic.ca/~jklymak/
> 
> 
> 
> 
> 
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