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Hi all,

I have simulated a 2D(3D as well) flat plate placed normally to the incoming flow. The Drag coefficient for 2D(and 3D) is well documented, which Cd is ~1.98 for 2D flat plate and ~1.3 for 3D flat plate.

However, the drag coefficient obtained from my data is way much greater than the established value (I get Cd>5 for 2D case). I use the same method that is used in the "vortexshedding" tutorial but I added k-w(SST) turbulence model.

Since, the drag is based on the pressure differences between the upstream and downstream region, the whole perimeter of the flat plate (the front, rear and 2 sides surfaces) is selected as the input parts.

Have I done anything wrong, especially on the "parts" selection? Should I select the front surface only instead of all surfaces? I got a close result by selecting only the front surface (Cd=2 for 2D case), but I'm not sure whether this is a correct approach.

I sincerely appreciate any comment and advice, thank you in advance.