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help for DEFINE_CG_MOTION for a flapping airfoil

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Old   March 5, 2011, 11:16
Default help for DEFINE_CG_MOTION for a flapping airfoil
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Dear Friends
I don't know how to write a UDF by the help of DEFINE_CG_MOTION for describe the sinosoidal motion of a flapping airfoil. In the user guide it is not mentioned how we can relate the UDF to the geometry of solid body (here airfoil).

Thanks beforehand
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