[Carpet] Regridding problem

[Ulrich Sperhake]

Hi Erik,

thank you for that information. I have one question: does this mean that 
all simulations using symmetry will be subject to this problem? For 
example in a standard BH binary evolution in the xy-plane, the boxes 
moving with the holes will always have refined regions touching the 
equatorial plane, i.e. refinement boundary and symmetry boundary have 
non-zero overlap.

Cheers,

Uli


On Wed, 13 Jun 2007, Erik Schnetter wrote:

> Dear Carpet users,
> 
> we have found a problem in Carpet's regridding algorithm.  After regridding,
> the boundary conditions need to be re-applied if the refined regions are near
> a boundary (e.g. a symmetry boundary).  Carpet does not apply the boundary
> conditions to the past time levels, so that the next time interpolation leads
> to wrong results at the mesh refinement boundaries.  This error is somewhat
> difficult to see, since it is present mostly on the past time levels, which
> are usually not output.
> 
> I am working on a correction.  In the mean time, please be careful about
> refinement boundaries near symmetry boundaries.
> 
> -erik
> 
> 

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Ulrich Sperhake                        Tel.  : ++49 3641 947146
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