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Viscous-Inviscid Interaction Method for Wing Calculations

A quasi-simultaneous viscous-inviscid coupling method is developed for the calculation of three-dimensional steady incompressible flow over transport wing configura- tions. The external inviscid flow is computed with a constant-potential (Dirichlet) panel method, constructed from a constant source and doublet distribution over the wing surface and wake. From the used external flow formulation three approximations for the veloc- ity components are derived, required for the fully three-dimensional quasi-simultaneous viscous-inviscid interaction scheme. The viscous layer is described with three integral boundary layer equations, in a Cartesian coordinate system, which are solved simulta- neously with the approximations for the external flow by Newton's method. Results are presented for two three-dimensional wing flow cases, including separation, and compar- isons are made with two-dimensional viscous-inviscid interaction results.