# Problem found in Pointwise - Fluent

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 August 30, 2011, 08:10 Problem found in Pointwise - Fluent #1 New Member   John Moore Join Date: Oct 2010 Posts: 9 Rep Power: 9 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 ming likes this.

 August 30, 2011, 09:26 Check your grid normals in Pointwise #2 Senior Member     Rick Matus Join Date: Mar 2009 Location: Fort Worth, Texas, USA Posts: 115 Rep Power: 10 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

 August 30, 2011, 10:41 #3 New Member   John Moore Join Date: Oct 2010 Posts: 9 Rep Power: 9 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?

 August 30, 2011, 11:15 Right-handed #4 Senior Member     Rick Matus Join Date: Mar 2009 Location: Fort Worth, Texas, USA Posts: 115 Rep Power: 10 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

 August 30, 2011, 20:46 #5 New Member   John Moore Join Date: Oct 2010 Posts: 9 Rep Power: 9 Thank you , Rick

September 22, 2013, 06:23
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 Originally Posted by Joke 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
Hi, Joke,

Or you can try the command 'mesh/repair-improve/repair' in Fluent command line.
May help to you.

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