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Analytic solutions for potential flow over a class of semi-infinite two-dimensional bodies having circular-arc noses

Published online by Cambridge University Press:  29 March 2006

John L. Hess
Affiliation:
McDonnell Douglas Corporation, Douglas Aircraft Company, Long Beach, California

Abstract

A new class of analytic solutions to the problem of two-dimensional potential fnow is presented here. The method of solution has features of both direct and indirect solutions. The bodies about which flow is computed are semi-infinite and have forward regions that either are flat or consist of a circular arc, which may be convex or concave to the flow. Closed-form solutions are obtained for the surface velocity. Afterbody shapes are defined by implicit equations containing a quadrature. Certain analytic properties of the solutions are investigated. An interesting feature of the bodies is the presence of a ‘pseudo corner’ where the slope angle is continuous but the curvature is infinite. The surface velocity becomes logarithmically infinite at these points in contrast to the power-law behaviour at a true corner. One case of the convex circular arc has finite velocity everywhere, and in some sense represents flow over a circular cylinder with a ‘natural’ separation point. This point occurs at 77·45° from the front stagnation point, which is close to the separation point for incompressible laminar boundarylayer flow.

Type
Research Article
Copyright
© 1973 Cambridge University Press

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References

Hess, J. L. 1971 Douglas Aircraft Co. Engang Paper, no. 5987.
Hess, J. L. & Smith, A. M. O. 1966 Prog. in Aeron. Sci. 8, 1.
Milne-Thomson, L. M. 1950 Theoretical Hydrodynamics. Macmillian.
Rankine, W. J. M. 1871 Phil. Trans. 161, 267.