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Old   April 20, 2006, 11:43
Default negative volume 2d
  #1
AJG
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Hi,

I'm meshing a square domain with a hole in the middle. Is 2d and very simple, but when I check the grid in fluent it tells me that I have a negative volume! what can I do?

Thanks
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Old   April 21, 2006, 03:29
Default Re: negative volume 2d
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gernot
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Is it axysymetric? Because then you must not have a grid with negativ y-cordinates.
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Old   April 21, 2006, 04:33
Default Re: negative volume 2d
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Claud
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Hi, the best thing is to work only in positive directions for x- and y-axis. In case you want to rotate your square, then your rotation axis has to be the x-axis! Claud
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Old   April 21, 2006, 04:42
Default Re: negative volume 2d
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philipov
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I had a similar problem. Increase number of nodes and try different meshing scheme.
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Old   April 21, 2006, 06:52
Default Re: negative volume 2d
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Rajesh
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This is more common when you have highly curved regions in your domain. In this case you have a circle where the grid may generate the negative volume on it. This can be elimintaed by dividing circle into more no. of segments and then mesh it. You need to try with diffrent grid spacings also.

regards

Rajesh
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