English

DTIC AD0892535: Subsonic Unsteady Aerodynamics for General Configurations. Part 1. Volume 2. Computer Program H7WC

Two methods of accounting for body-lifting surface interference in unsteady flow are considered. The first method is described in Part 1 of the report, while the second will be described in another paper. The first method is a direct application of nonplanar lifting surface elements to both the lifting surfaces and the body surfaces. The body is treated as an annular wing. This type of idealization must be used with an axial doublet introduced to account for body incidence effects. The undesirable effects of the annular wing representation are then reduced. The report also describes an improvement of the Doublet-Lattice Method of Albano and Rodden. The improvement pertains to wing- tail problems where there exists a small vertical (non-zero) separation between the wing and tail planes.

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