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-   -   Drag coefficient of square cylinder (http://www.cfd-online.com/Forums/main/82508-drag-coefficient-square-cylinder.html)

tonka November 28, 2010 16:08

Drag coefficient of square cylinder
 
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?

nidhul 07 March 15, 2014 13:08

yes ofcourse . i had done the simulation with Re=22000 and i obtained the value of cd=1.98
(kw sst model )

mali April 2, 2014 21:42

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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