Problem to set reference AREA of a sphere?
I am simulating the incompressible flow over a sphere in 2D-axisymmetric model and try to calculate Cd using k-w-SST model for Re=2*10^6. I consider radius=0.5. In the setting report>reference value>area----- If I put area=3.14(surface area=4*pi*r^2) then I found Cd=0.05.(But some paper says it is 0.15-0.17). On the other hand, If I put area=0.785(area of circle=pi*r^2) then Cd=0.174(which is similar to that). So, may I put the area=0.785 as reference area? But, If I compute area using fluent: report>surface integral>area compute----- then It shows area=3.14. So, I am in dilemma--- Could anybody help me??????
It is the projected area of the sphere to the main flow direction and not surface area of the sphere.So your area will be 0.785 (that of the circle). Hope it helpds
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