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Problem found in Pointwise - Fluent

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Old   August 30, 2011, 08:10
Default Problem found in Pointwise - Fluent
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John Moore
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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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Old   August 30, 2011, 09:26
Smile Check your grid normals in Pointwise
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Rick Matus
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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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Old   August 30, 2011, 10:41
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John Moore
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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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Old   August 30, 2011, 11:15
Smile Right-handed
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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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Old   August 30, 2011, 20:46
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Thank you , Rick
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Old   September 22, 2013, 06:23
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Quote:
Originally Posted by Joke View Post
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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