Hi,
I suggest to verify UDF implementation and make sure that the UDF is hooked correctly to the dynamic mesh solver and the necessary functions and variables are defined properly. Check that the coordinate system used in your UDF aligns with the rotating domain. Ensure that you are calculating the flap angle correctly within the UDF.
I recommend to start with a simplified case to validate your UDF implementation. Ensure that the flap motion behaves as expected in a simple setup before moving to more complex configurations.
Thank you
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