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Reliability of 3d urans

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Old   December 7, 2015, 06:22
Default Reliability of 3d urans
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anand sudhi
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Hi

How reliable is the accuracy of 3D URANS. Is it always better to go for LES or DES in 3D cases or is 3D URANS sufficient for calculation of mean quantities like Drag values.
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Old   December 7, 2015, 09:38
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What is the source of the unsteadiness, and what size are your time steps with respect to the larger turbulent fluctuations? URANS is not well formulated as you refine your timestep, and it's accuracy will strongly depend on the character of the unsteadiness you're trying to capture. Note that it also has all the short comings of regular steady-state RANS as well; so if your flow contains strong anisotropy then it would also not be that accurate for example...
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