[MITgcm-support] R_STAR issue

[Martin Losch]

Hi Jonny,

I am not sure if the time step is the issue (because the error message does not say anything about that).

You will get further error messages in STDERR, usually the layer thick has become too thin (or thick). This can mean that
(a) the model explodes, possibly due to clf criteria violations and then the old thread suggests the right thing to do
(b) the free surface has enormous excursions. Often this happens in the presence of very thick ice (compared to the vertical cell thickness), or when there is a sea level drop because your somehow drain your domain (through open boundaries, say). In this case the smaller time step will not help.

If you don’t need rStar then you can just turn it of by setting select_rStar=0, in data

M.

> On 12 Jun 2015, at 12:24, Jonny Williams <Jonny.Williams at bristol.ac.uk> wrote:
> 
> Hi everyone 
> 
> I've fixed this now by reducing the time step following the suggestion here...
> 
> http://mitgcm.org/pipermail/mitgcm-support/2011-July/007362.html
> 
> Cheers
> 
> Jonny
> 
> 
> On Friday, 12 June 2015, Jonny Williams <Jonny.Williams at bristol.ac.uk> wrote:
> Hi everyone
> 
> I'm working with a slightly different setup to normal (different viscosity parameters mainly) and this involves a slight change of coordinate system. 
> 
> I have had to recompile with...
> 
> #undef DISABLE_R_STAR 
> 
> ... in my CPP_OPTIONS.h file because the error message told me to do so! 
> 
> However I am now getting the following error...
> 
> ABNORMAL END: S/R CALC_R_STAR
> 
> Has anyone sent this before?
> 
> Thanks!
> 
> Jonny
> 
> 
> 
> -- 
> Dr Jonny Williams
> School of Geographical Sciences
> Cabot Institute
> University of Bristol
> BS8 1SS
> 
> +44 (0)117 3318352
> jonny.williams at bristol.ac.uk
> http://research-information.bristol.ac.uk/person/Jonny.Williams 
> 
> 
> 
> -- 
> Dr Jonny Williams
> School of Geographical Sciences
> Cabot Institute
> University of Bristol
> BS8 1SS
> 
> +44 (0)117 3318352
> jonny.williams at bristol.ac.uk
> http://research-information.bristol.ac.uk/person/Jonny.Williams 
> 
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