Ansys Fluent - Drag Coefficient (Reference Values) Square 45° 2D
Written by cfd.ninja
In a two dimensional case the drag coefficient still comes from the force divided by the reference values, but the area means something different: Fluent treats the domain as having unit depth, so the reference area is the projected length of the body multiplied by one metre.
That single detail is behind most wrong 2D coefficients. If you type the area of the 3D object you had in mind, or leave the default value of one, the coefficient is off by a constant factor while the flow field itself is perfectly fine.
The rest of the reference values follow the incoming stream: velocity and density as they are far upstream, and the length set to the characteristic dimension you want the Reynolds number based on.
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