[Users] Simulation domain volume and reduction weight sum differ

[Erik Schnetter]

Luca

Yes, in principle they may be caused by wrong parameters, in particular
concerning number of boundary points. However, there may also be an error
in determining the grid point weights, e.g. when the grid shapes are very
weird (concave corners, grids too close to each other, etc.)

-erik

On Sun, Sep 9, 2012 at 8:31 PM, Luca Baiotti <baiotti at ile.osaka-u.ac.jp>wrote:

> Hello,
>
> I am seeing this warnings in a BNS moving-grid simulation without
> CarpetMask (using carpet's development version). It appears only after a
> limited (small) number of regriddings (close to one another) during the
> inspiral, not at the very beginning of the simulation. So I would think
> that they are not caused by wrong parameters. May they be?
>
> Cheers,
> Luca
>
>
> On 9/27/11 10:41 AM, Erik Schnetter wrote:
> > There are three possible causes for this warning:
> >
> > 1. An internal error in Carpet (that's why the warning was put in)
> > 2. An inconsistent grid structure setup, e.g. near a symmetry or an
> > outer boundary, i.e. an error in a parameter file
> > 3. You are using thorn CarpetMask to exclude a horizon from reductions
> >
> > In case 3 the warning is harmless (and should not be there -- sorry).
> >
> > -erik
> >
> > On Mon, Sep 26, 2011 at 9:25 PM, Jakob Hansen
> > <jakobidetsortehul at gmail.com> wrote:
> >> Hi,
> >>
> >> Using mercurial, I get this warning during simulations :
> >>
> >> INFO (CarpetReduce): Simulation domain volume: 170368000
> >> INFO (CarpetReduce): Reduction weight sum:     170367999.880642
> >> WARNING level 1 in thorn CarpetReduce processor 0 host tachyon2974
> >>    (line 120 of
> >>
> /home01/r632kgw/jakob/CactusP/arrangements/Carpet/CarpetReduce/src/mask_test.c):
> >>    -> Simulation domain volume and reduction weight sum differ
> >>
> >> Simulations seem to run okay though. What is causing this warning and
> is it
> >> serious or can I just ignore it?
> >>
> >> Cheers,
> >> Jakob
> >>
> >>
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> >>
> >>
> >
> >
> >
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-- 
Erik Schnetter <schnetter at cct.lsu.edu>
http://www.perimeterinstitute.ca/personal/eschnetter/
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