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RESEARCH PAPERS

On Damping of the Normal Component of Fluctuations in the Wall Region of Turbulent Flow

[+] Author and Article Information
Wlodzimierz Kozlowski

Polish Academy of Sciences, Institute of Fundamental Technological Research, Department of Fluid Mechanics, 00-049 Warsaw, Poland

J. Appl. Mech 58(2), 572-578 (Jun 01, 1991) (7 pages) doi:10.1115/1.2897223 History: Received February 02, 1989; Revised May 30, 1990; Online March 31, 2008

Abstract

Effective model representation of the normal component of ordered motions in the wall region of a turbulent flow is proposed. Analysis of this model enables us to express the value given by the Van Driest damping function at a point with coordinate y (distance to the wall) as a relationship between intensities of the normal component of pulsations which are defined at points 2y, y, and y/2. The novel formula has no empirical coefficients and can successfully replace the Van Driest function in computations. It appears to take account of the damping effect which results locally from distinct classes of ordered motions directed wallwards or outwards within the wall region of a turbulent flow.

Copyright © 1991 by The American Society of Mechanical Engineers
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