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Why DDES=RANS?

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Old   May 25, 2011, 10:54
Default Why DDES=RANS?
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Aladdin
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Hi everybody,
I meet a very strange problem . When i use my code to calculate a 2D naca0012 airfoil with DES, and i got the complex vortex systems. Using the same grid, when i simulated it by DDES, the result was same with RANS, who can give me some suggestion? THX
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Old   May 26, 2011, 01:02
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Raashid Baig
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Quote:
Originally Posted by aladdincham View Post
Hi everybody,
I meet a very strange problem . When i use my code to calculate a 2D naca0012 airfoil with DES, and i got the complex vortex systems. Using the same grid, when i simulated it by DDES, the result was same with RANS, who can give me some suggestion? THX
which software did you use ?
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Old   May 26, 2011, 21:35
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This is a big problem with DDES. It is very sensitive to the Initial condition and the grid you use. Spalart has mentioned this as a possible problem in DES. Try using IDDES or the other new versions of the model.
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