[MITgcm-support] format of input files wrong in regional model with open boundary conditions?

[Jody Klymak]

Hi Jonny,

I think you are confused about your SIZE.h.

sNx is how many x grid points to put on each subgrid
nSx is how many subgrids to put on each processor
nPx is how many processors.

I usually always use nSx=1, but maybe you have some reason for having more than one subgrid on each processor?  

Anyway, Nx is the product of all three numbers.  nSx*nPx just corresponds to the number of subgrids in the x dimension.  

Cheers,   Jody

On Dec 10, 2013, at  8:28 AM, Jonny Williams <Jonny.Williams at bristol.ac.uk> wrote:

> Thank you again!
> 
> Those are both great suggestions and I will have a look at both.
> 
> My current hypothesis is that I have gotten something wrong in SIZE.h
> 
> Currently I have the following parameters 
> 
> 
>       PARAMETER (
>      &           sNx =  41,
>      &           sNy =  89,
>      &           OLx =   4,
>      &           OLy =   4,
>      &           nSx =   1,
>      &           nSy =   3,
>      &           nPx =  11,
>      &           nPy =   3,
> .
> .
> .
> ... and my grid NetCDF files (which are being created correctly it seems) have 99 grid elements, which is equal to (nSx*nPx)*(nSy*nPy) in my current setup. I am currently playing around with these numbers to see if this makes a difference.
> 
> Thanks again!
> 
> Jonny
> 
> 
> 
> 
> 
> 
> On 10 December 2013 16:13, Patrick Heimbach <heimbach at mit.edu> wrote:
> 
> Jonny,
> 
> On Dec 10, 2013, at 10:12 AM, Jonny Williams <Jonny.Williams at bristol.ac.uk> wrote:
> 
> > Given what you have just said , would it therefore be reasonable to assume that the dimensions of the input files I have created are wrong?
> 
> That might indeed be the case.
> 
> Either wrong dimensions or you are providing real*8 fields where the model expects real*4?
> (you'd have to look what accuracy you are prescribing).
> 
> One way to find out is to see how many time steps the model runs successfully, i.e. how many records are read successfully before the crash. Perhaps that gives a clue.
> 
> p.
> 
> ---
> Patrick Heimbach | heimbach at mit.edu | http://www.mit.edu/~heimbach
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> 
> 
> -- 
> Dr Jonny Williams
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> University of Bristol
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