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Cfd simulation on a smooth cylinder (drag coefficient)

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Old   October 12, 2016, 20:03
Default Cfd simulation on a smooth cylinder (drag coefficient)
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Simone
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Hi to everyone!
Now I will explain my problem:

-Software: STARCM+
-Goal: find the right value of drag coefficient on my cilinder
-Details: u=45.9 m/s, D=1 m, Re=2.9*10^6
- 2D Domain: 10D over the cylinder, 10D belowe the cylinder, 10D at the left of the cylinder, 20D to the right od the cylinder
-Boundary conditions: top and bottom planes are symmetry planes, the right plane is pressure outlet, the left plane is velocity inlet

I can't find the right value of the drag coefficient on my cylinder!! I am getting crazy since the beginning of Semptember!
I have tried both (steady) k-epsilon and k-omega model, but nothing, I have always oscillations (small or large) on the drag coefficients, around 0.4 (that is the right value if I would have a Reynolds of 1*10^6), but I need a value around 0.7 , 0.8 ... Can anyone help me, please?!
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