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My forceCoeffs has very serious numerical oscillations

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Old   July 2, 2023, 22:24
Default My forceCoeffs has very serious numerical oscillations
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Hello gus!I used the immersion boundary method of foam-extend 4.1 to calculate the fluctuation of the airfoil, and why the calculated thrust coefficient and drag coefficient changed very sharply, not a smooth sine wave.
In addition, when I solved, the number of iterations of the pressure equation was very large, between 400-1000 times, is it because p is inaccurate.
Below are my controlDict and fvschems and fvsolutions files.
Does anyone until how to fix this?Thank You!
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