Roland,
Just a late follow-up:
Unless you use an excision mask, you should not ever see this error.
I am using an excision mask.
If I change revlevels to 1, then the error goes away. But yes, as you say, this grid configuration was deemed necessary for multigrid work.
I've noticed that the warning is "non-critical" -- i.e. the simulation seems to proceed fine despite this message. I probably just never noticed the warning before, but have noticed it recently now that I'm using Mojave which colors such messages in red. :-)
Thanks, Scott
On 1/28/14 6:22 PM, "Roland Haas" roland.haas@physics.gatech.edu wrote:
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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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