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August 30, 2011, 09:10 |
Problem found in Pointwise - Fluent
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#1 |
New Member
John Moore
Join Date: Oct 2010
Posts: 9
Rep Power: 16 |
Hi, everyone
thank you for your kindly support me. I created 2Dmesh of backward stepping flow problem in pointwise and exported as .case file to run simulation in fluent. When I checked mesh in fluent, it told that "non-positive volume exist". I applied the inlet velocity at boundary on the left hand side with type "Magnitude,Normal to boundary" say 1m/s and I performed initialization, the result show that my velocity is -1m/s. The simulation still run and the result showed that fluid is flow from right to left ! (Infact it should flow from left to right) http://imageshack.us/photo/my-images...isefluent.png/ Could anyone guide me "What cause theis problems ? (Pointwise or fluent) and how to solve it" thank in advance joke |
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August 30, 2011, 10:26 |
Check your grid normals in Pointwise
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#2 |
Senior Member
Rick Matus
Join Date: Mar 2009
Location: Fort Worth, Texas, USA
Posts: 116
Rep Power: 17 |
Hi John:
In Pointwise, check the grid and make sure it is right-handed. (Use Edit, Orient to check the I, J directions and change them if necessary to make the grid right-handed.) This is the most likely cause of negative volume cells in a 2D mesh. Hope this helps, Rick |
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August 30, 2011, 11:41 |
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#3 |
New Member
John Moore
Join Date: Oct 2010
Posts: 9
Rep Power: 16 |
Hi, rmatus
thank you very much rmatus. It's very helpful. May I confirm your answers, If I want to make a grid right-hand : I should point to the right, J point upward and K should point outward from the computer, right? |
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August 30, 2011, 12:15 |
Right-handed
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#4 |
Senior Member
Rick Matus
Join Date: Mar 2009
Location: Fort Worth, Texas, USA
Posts: 116
Rep Power: 17 |
Joke:
That's right. I to the right, J up, which means K is coming out of the screen. That will be right-handed. Rick |
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August 30, 2011, 21:46 |
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#5 |
New Member
John Moore
Join Date: Oct 2010
Posts: 9
Rep Power: 16 |
Thank you , Rick
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September 22, 2013, 07:23 |
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#6 | |
New Member
Black Ghost
Join Date: Sep 2013
Location: Xi'an
Posts: 2
Rep Power: 0 |
Quote:
Or you can try the command 'mesh/repair-improve/repair' in Fluent command line. May help to you. |
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