Ansys Fluent - Drag Coefficient (Reference Values) Cube 3D
Written by cfd.ninja
The drag coefficient Fluent reports is not measured, it is computed from the force on the body divided by the reference values you typed in. If those values do not describe your case, the coefficient is wrong even when the flow field is perfectly converged.
Three of them carry the weight: the area, which for a bluff body such as a cube is the frontal area facing the flow; the velocity of the incoming stream; and the density of the fluid. The length only matters for moment coefficients and for the Reynolds number Fluent displays.
A useful check is the order of magnitude. A cube facing the flow squarely sits near a drag coefficient of one, so a result of 0.01 or 50 points at the reference values, not at the physics.
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