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formula used for drag force?

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Old   April 2, 2010, 10:21
Default formula used for drag force?
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Hi. I have meshed a car body and solved it in fluent. The solution got converged. I took the value of drag force and drag co-efficient from the report-forces menu. I have taken the projected area also.
Even though both the drag forces and drag co-efficients are displayed there, i liked to find the drag force with the displayed drag co-efficient using the formula Df = Cd*0.5*rho*A*V^2. But the drag force obtained is different from the drag force displayed there. why?....
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