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Fluctuation of residual plot for steady state simulation

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Old   September 13, 2019, 03:06
Default Fluctuation of residual plot for steady state simulation
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I am currently doing simulation for NACA 4412 airfoil with a slot. The simulation obtained the result is expected for low angle of attack but it fails to converge when the angle of attack become high. This is the residual plot for angle of attack of 14 degree.

fluc.JPG

Is the mesh problem or the setting problem ?

Thanks in advance.
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