[Users] CarpetReduce: Formerly working par file now yields 'Simulation domain volume and reduction weight sum differ'

[Roland Haas]

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Hello Scott,

> Making that change didn't affect the error. You're off the hook.
> ;-)
'Simulation domain volume and reduction weight sum differ' is a
diagnostic warning that CarpetReduce produces when it thinks that the
volume of the non-excised grid points is incorrectly computed. Unless
you use an excision mask, you should not ever see this error. We have
however in the past had problems with getting the test to work
correctly. Basically it is non-trivial to keep track of how much of
the grid volume ought to be removed for each masked point. Since you
are not using CarpetMask I would suspect that CarpetRegrid created a
grid that is considered incorrect. The grid may be incorrect or
Carpet's test. Looking at your parfile you seem to overlay the
coarsest level with two more refined levels of the same size but
higher resolution. This is "unusal" in that evolution runs would not
use this (though I see what for a MG solver this may be needed). So my
first test would be to reduce the number of reflevels to 1 (coarse
only) and see if this works. Then add one level but reduce its size to
half that of coarse one. If this fails, I'd increase the resolution to
have more than 12 cells present to see if the grids are too small.

Yours,
Roland

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