[Carpet] regridding?

[Ian Hawke]

On Fri, 2006-05-05 at 16:25 +0200, Bela Szilagyi wrote:
> Cristian Ott and I have found a feature of Carpet that could be regarded as a bug.
> Say you are on refinement level 3 out of 3.  You ask for a regrid by setting CarpetRegrid::coordinates, and your new parameter value involves a change of refinement level 2.
> Carpet will regrid and schedule PostRegrid for refinement level 3 but not for the coarser levels.

Does this happen all the time, or only if you regrid when level 3 and
level 2 are not in sync? According to my reading of the code it should
only happen in the latter case.

I would say that you should be allowed to change the coarser grid (it is
one way of implementing true AMR) but should only be able to do it when
the grids are in sync.  I would consider anything else to be an error in
the regridding algorithm, not necessarilly in Carpet.

Ian

> I would propose one of the following:
> 1. explicitely forbid requests of refinement level changes of a coarser grid than the current one
> 2. delay these requests till evolution gets to the appropriate coarser grid
> 3. schedule postregrid for the coarser levels as well
> 4. schedule postregrid for all levels at any regrid event.
> 5. whatever...
> 
> 
> On Friday 05 May 2006 15:07, Bela Szilagyi wrote:> Should we introduce a parameter that will tell CarpetIOHDF5  that at> recovery it should read the value of CarpetRegrid::coordinates (and> possibly other carpetregrid parameters) from the checkpoint file rather> than from the parameter file?  This would go along the same lines as>> CarpetIOHDF5::use_reflevels_from_checkpoint>> introduced by Christian Ott.>> On Thursday 04 May 2006 17:31, Erik Schnetter wrote:> > 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.
> -- Bela Szilagyi----------------------------------------------------Max-Planck-Institut für GravitationsphysikAlbert-Einstein-InstitutTel: +49 331 567 7632Fax: +49 331 567 7649----------------------------------------------------
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-- 
Ian Hawke <ih3 at soton.ac.uk>