[GP_FDU]

I simulated flow over a cylinder with k-omega SST model. But the result was very wrong.
Here is some configuration of my case. D=3.81cm, U=0.19m/s, fluid is set to be water.
U and p B.C. is set as usual.
B.C. of k is fixedValue=1e-12 at the cylinder.
B.C. of nut is fixedValue=nutUSpaldingWallFunciton at the cylinder or fixedValue=1e-12.
B.C. of omega is omegaWallFunction.
y+is around 1 according to y+=0.172*delta_y/D*Re^0.9.

With this configuration, there is vortex shedding and the frequency seems to be Ok, but the pressure at the cylinder is totally wrong, which leads to a wrong drag and lift force.

Anybody know what is wrong with my case, please give me some advice.