[zhoubinwx]

Dear all,

I simulate the three simple cases with uniform flow around a cylinder(air viscosity):
R(mm) U(m/s) Cd
1 0.0002468 102.4368
2 0.0001234 132.8182
4 0.0000617 231.2099
The upstream, downstream and top distances from the cylinder center are the same:100 millimeter.
Since the Re numbers are the same in these three cases, I do not know why Cd is different from each other. According to theory, they should be the same when Re is the same. I use simpleFaom, and the residual for U is 10^(-6), for p is 10^(-5).

Thank you for your attention.

Bin