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Pitching and Plunging Oscillation with Broadband forcing

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Old   February 6, 2011, 12:36
Default Pitching and Plunging Oscillation with Broadband forcing
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Hi all,

I want to know if it is possible to define in the UDF for the pluging and pitching of an airfoil a random function instead of sinusiod.

instead of sin cos, I want to use rand function, but how I dont know? Any help?

My 2nd question : I always have the problem of negative voulme cells when I use the dynamic mesh feature.

For the dynamic zone, I define only the airfoil and it is rigid body motion.
I choose layer, then both smoothing and remeshing but no success.

After some iterations I get negative volume cells.

Thanks a lot
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