Abstract
This paper discusses the analytical aspects of the determination of drag acting on a model in a wind tunnel under subsonic or transonic flow conditions. The drag integral is derived from the integral form of the momentum equation in order to take the compressible flow effects into account. The drag integral can be broken down into profile drag (including wave drag) and induced drag. An analytical expression for induced drag has been developed in order to minimize the grid dependency problem, which is inherent in the numerical solution procedure. This analytical approach allows us to evaluate the effect of the wind tunnel walls on the drag. Predicted drag numbers from several different formulas are compared with experimental measurements.
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