# negative volume 2d

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 April 20, 2006, 11:43 negative volume 2d #1 AJG Guest   Posts: n/a 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

 April 21, 2006, 03:29 Re: negative volume 2d #2 gernot Guest   Posts: n/a Is it axysymetric? Because then you must not have a grid with negativ y-cordinates.

 April 21, 2006, 04:33 Re: negative volume 2d #3 Claud Guest   Posts: n/a 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

 April 21, 2006, 04:42 Re: negative volume 2d #4 philipov Guest   Posts: n/a I had a similar problem. Increase number of nodes and try different meshing scheme.

 April 21, 2006, 06:52 Re: negative volume 2d #5 Rajesh Guest   Posts: n/a 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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