Does openfoam quite sensitive to the sharp corners of the geometry?
 

Hello, all

I'm trying to simulate the flow field around a cube in uniform flow. The mean pressure distributed around the cube is a little discontinuous as shown in the attached picture. To solve this, I added small fillets to the sharp edges, the radius of which is 1/100 of the side length of the cube. Since the radius is quite small, the effect of the fillets is expected to be negligible, however, the drag coefficient drops from about 1 to about 0.7, which is apparently huge change.

The question I want to ask is that dose this happen due to the inherent features of openfoam? Is it possible to fix this problem? BTW, Do you have any good ideas about how to deal with the discontinuous of the mean pressure distribution? Thanks a lot!

Best