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Lift coefficient

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Old   October 12, 2016, 00:38
Default Lift coefficient
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Hi, i need help with my final year project. i am simulating the transient flow condition around a sepak takraw ball, anyone has any idea why my graph of lift coefficients is showing a weird trend (as attached below)? one complete rotation of the ball takes approximately 0.06s.

Thanks in advance and any help is very much appreciated!lift.jpg
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