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Old   June 29, 2011, 05:24
Smile Need help with Fluent Dynamic Mesh
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ZHAO Yuqaio
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Dear all,

I'm a starter on using FLUENT, and I got lots of difficulties.

Now I'm trying to learn dynamic mesh, and in the attachment is my first trial.

I create a circle with one blade inside. The tip of the blade touches the internal rim of the circle. I would like to try to make the tip rotates about the center of the circle. However, I couldn't make it. "Negative Cell" occurs every single time I ran the "Mesh Motion".

I hope that I could get some help here. Thank you guys sooooo much!
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Old   June 29, 2011, 06:28
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Hi Bridges,

I have a question to you at first. How do you implement your text file in Fluent. What you wrote is no typical UDF-Code. Did you compile it?

Try it with (omega_z 0 0 0.5).
(omega_z 2 3 4) causes a movement around all three axes (x, y and z). As your mesh is only 2D, you get negative cells at once. The unit of angular velocity is rad/s.
If the problem still arises, try to decrease your time step until it works.

Good luck!
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