[Carpet] regridding?

[Erik Schnetter]

On May 4, 2006, at 09:30:17, Bela Szilagyi wrote:

> Can one (or -- is one supposed to) adjust carpet grid structure by  
> steering
> dynamically the parameter CarpetRegrid::coordinates  ?

Yes, this is supposed to work.

[schnipp]

> A short time after this parameter change AHFinderDirect quit with the
> complaint
>
> WARNING level -1 in thorn AHFinderDirect processor 2 host ic0141
>   (line 78
> of /home/szilagyi/Cactus/configs/harm/build/AHFinderDirect/jtutil/ 
> error_exit.cc):
>   -> ***** modulo_reduce(): no modulo value is fuzzily within  
> specified range!
>                        x = 0   xmod = 6.28319
>                        [xmin,xmax] = [0.610865,1.74533]
>                        ==> xx = 0
>
> which suggest incorrect coordinate range.  AHFinderDirect had no  
> problem
> working until the parameter change.  Erik, just to make your  
> argument against
> Jonathan's code more difficult, this is YOUR branch.

This tries to find a value between 0 and 2pi; this looks like it is  
finding a value on a sphere, not in 3D.  AHFinderDirect does not care  
at all about the shapes of the 3D grids, it only calls the  
interpolator.  Your problem may be that the spacetime variables have  
gone bad, and the AH finder now gets confused internally because  
certain algorithms do not converge.

If you have a stack backtrace and variable values, Jonathan may be  
able to help pointing at the real source of the problem.  Of course,  
ultimately still the change of the grid structure could be to blame.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>

My email is as private as my paper mail.  I therefore support encrypting
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