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Old   November 28, 2010, 16:08
Default Drag coefficient of square cylinder
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I'm testing a new CFD code using the turbulent flow around a square cylinder as a validation case. Pulblished drag coefficient Cd (measured and CFD) are typically between 2.0-2.1 for Re of 20000. My initial 2D runs gave Cd of 2.8 which is significantly higher than established number. At this point I can either try finer mesh size or move to 3D which takes a lot longer. My question is, can one get the 2.0 - 2.1 drag coeff. using 2D modeling?
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Old   March 15, 2014, 14:08
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yes ofcourse . i had done the simulation with Re=22000 and i obtained the value of cd=1.98
(kw sst model )
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Old   April 2, 2014, 22:42
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Hi All,

Thanks for posting this topic. I also got about the same value, CDmean = 2.13 and CLrms = 1.36, using 2d kw-sst model and a wall function. The number of cell along the edge is 30 x 4edges.

But when I refine the grid to 80 x 4edges and without wall function (y+ < 3), the CDmean drop to 1.57 and CLrms drop to 0.45. Any comment??

Thanks,
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