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oscillation of the pressure coefficient! why?

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Old   June 29, 2009, 14:17
Default oscillation of the pressure coefficient! why?
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after a steady state simulation around a NACA 4415 airfoil i have plotted the cp_polar (the plot is attached) and noticed a oscillation of the pressure coefficient cp!
the used turbulence model was SST!

what may be the reasons for that oscillation?

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File Type: jpg cP_NACA_4415.jpg (86.9 KB, 37 views)
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Old   June 29, 2009, 18:34
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Glenn Horrocks
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My first guess is facetting of the geometry. You need a smoother shape. Second guess is incomplete convergence.

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