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Old   June 1, 2006, 12:34
Default flow over sphere
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hi i am trying to bench mark flow over spher problem with experimental results. The drag coefficent what i am getting with cfd is not matching with experimental. Any boby can guess. the flow field is steady, 3d, Laminar and Reynold no is 100. Thanks in advance.

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Old   January 30, 2010, 12:50
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you should check where the transition and separation is taking place in both casses.
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Old   January 30, 2010, 14:04
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On the same mesh do a turbulent simulation and check your y+ if this is larger then 1, the n you are not properly solve the boundary layer region.

You can create your mesh in order to have a y+<1 and then do again the laminar calculation - also try steady vs. unsteady. You can find here on cfd-online a good y+ estimator.

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