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April 25, 2012, 11:12 |
Axis boundary condition.
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#1 |
Member
AHMAD
Join Date: Apr 2012
Posts: 54
Rep Power: 0 |
Hi,
When i try to make axis boundary condition to solve an axissymmetric problem Fluent gives me this warning: Warning: non-positive volumes exist. this is a picture of my mesh. Thank you. |
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April 25, 2012, 12:40 |
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#2 |
Member
AHMAD
Join Date: Apr 2012
Posts: 54
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Any solutions?
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April 25, 2012, 13:41 |
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#3 | |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,674
Rep Power: 66 |
Quote:
For axissymmetric problems, the axis of symmetric is defaulted and can only be set to the x-axis. From your drawing, this seems to be the case. Non-positive volume error means that you have negative cell volumes. It is a meshing error and you need to correct your mesh. Usually it is caused by bad cells. Not sure how this would pertain though to a 2D mesh. Last edited by LuckyTran; April 25, 2012 at 16:25. |
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April 25, 2012, 16:17 |
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#4 |
Member
Join Date: Nov 2011
Location: Czech Republic
Posts: 97
Rep Power: 14 |
Also for asymmetrical boundary condition your whole geometry has to be above x axis. When it is not, this message appears. You can quickly fix it by rotating your mesh in Fluent (under Mesh -> Rotate).
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April 25, 2012, 17:39 |
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#5 |
Member
AHMAD
Join Date: Apr 2012
Posts: 54
Rep Power: 0 |
Thank you for all of your replies it was so helpful.
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