Effects of Unsteady Free-Stream Velocity and Free-Stream Turbulence at a Stagnation Point

[+] Author and Article Information
R. S. R. Gorla

Department of Mechanical Engineering, Cleveland State University, Cleveland, Ohio 44115

J. Eng. Power 105(1), 66-71 (Jan 01, 1983) (6 pages) doi:10.1115/1.3227400 History: Received December 04, 1981; Online September 28, 2009


An analysis is presented to investigate the combined effects of transient free-stream velocity and free-stream turbulence at a stagnation point on a cylinder situated in a crossflow. A model has been successfully formulated for the eddy diffusivity induced by the free-stream turbulence. The governing momentum equation has been integrated by the steepest descent method. Numerical solutions are provided for the unsteady wall shear stress function for specific free-stream transients. The results are correlated by a new turbulence parameter. It has been found that the wall friction increases with increasing free-stream turbulence intensity. In the case of flows involving unsteady free-stream velocity, the friction factor increases with increasing values of the reduced frequency of oscillations.

Copyright © 1983 by ASME
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