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Is there error in this vorticity plot

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Old   November 5, 2007, 20:55
Default Is there error in this vorticity plot
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I'm trying to simulate an naca0012 airfoil oscillating in a flowfield. Re~10,000

I've got this vorticity plot

Unlike other vorticity plots, which have orderly vortices being shed, this one doesn't seem "normal". Is there something wrong with my code?

Or how do I anaylze vorticity plots like this? Is there any book which have a good discussion on these?

Thanks alot!
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