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October 10, 2013, 10:59 |
nagative volume
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#1 |
Member
shahrbanoo
Join Date: Mar 2013
Posts: 63
Rep Power: 13 |
Hi dears...
What does it mean when we have negative volume in mesh? how it happens? thanx... |
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October 11, 2013, 05:33 |
hi Dear
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#2 |
New Member
saeed
Join Date: Feb 2013
Posts: 19
Rep Power: 13 |
maybe it happen when your mesh's are complicated in together and have overlap volume........
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October 11, 2013, 13:03 |
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#3 |
Senior Member
Ashwani
Join Date: Sep 2013
Location: Hyderabad
Posts: 154
Rep Power: 12 |
Negative volumes are normally reported when your geometry contains very small "loops"(the first cell of the boundary layer extends beyond the edge of your geometry)near the curved edges. You can check the following link.
http://www.cfd-online.com/Forums/flu...lume-mesh.html |
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October 22, 2013, 18:22 |
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#4 |
New Member
SsS
Join Date: Oct 2013
Posts: 5
Rep Power: 12 |
Negative volumes occurs in the mesh because of the improper aspect ratio of the elements. It becomes a serious issue once if you try to deform the mesh. You can eliminate these negative volumes by using grid utility application that comes with your gird generator package.
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October 28, 2013, 03:45 |
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#5 |
Senior Member
Rami Ben-Zvi
Join Date: Mar 2009
Posts: 155
Rep Power: 17 |
You may also get negative volumes also if you have left-handed cells. E.g., in a 2D unstructured grid, when the mesher expect cell nodes indices numbered i-j-k-l in a counterclockwise direction, and you input some cells in clockwise direction.
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