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-   -   negative volume 2d (http://www.cfd-online.com/Forums/fluent/40670-negative-volume-2d.html)

AJG April 20, 2006 11:43

negative volume 2d
 
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

gernot April 21, 2006 03:29

Re: negative volume 2d
 
Is it axysymetric? Because then you must not have a grid with negativ y-cordinates.

Claud April 21, 2006 04:33

Re: negative volume 2d
 
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

philipov April 21, 2006 04:42

Re: negative volume 2d
 
I had a similar problem. Increase number of nodes and try different meshing scheme.

Rajesh April 21, 2006 06:52

Re: negative volume 2d
 
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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