Abstract

The two-dimensional unsteady flow of an incompressible viscous fluid around a circular cylinder, which is started impulsively from rest, is considered. Numerical solutions of unsteady boundary-layer equation are sought by employing the local non-similarity solution method presented by Sparrow, Quack and Boerner (Amer. Inst. Aero. Astronaut. J. 8 (1970) 1936), together with the difference-differential method. Numerical solutions are given for the velocity profile, wall shear and the time when the separation of the boundary layer occurs; the development of the boundary layer and its separation are discussed.

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