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Fluctuating residuals at high angle of attack for NACA0018

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Old   June 19, 2016, 02:06
Default Fluctuating residuals at high angle of attack for NACA0018
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Anand Thamban
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I am currently doing an analysis on NACA 0018 to find the stall angle. I have used k-kl-w turbulence model and Re=100,000. After around 18 degrees, the residuals keep fluctuating and so do the Cl values. Even after increasing the AoA, the Cl values fluctuate at a high value and do not seem to drop, like how it is usually supposed to. Can anyone explain the problem with this? I have tried many types of mesh and still encounter the same problem.
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Old   June 20, 2016, 07:58
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mostly it is related to mesh. second ally you must do transient analysis.
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aerofoil, fluctuating residuals, naca 0018

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