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Title:Boundary mode-vortex interaction in turbulent channel flow over non-wavy rough wall
Author(s):Riahi, Daniel N.
Subject(s):Boundary Mode-vortex Interactions
Turbulent Channel Flow
Non-wavy Rough Walls
Abstract:A turbulent model was developed and studied for a high Reynolds number channel flow over a non-wavy rough wall. The non-wavy wall can be rough over a number of finite domains in the streamwise direction x, and its shape function is represented in terms of exponential functions with real exponents. Asymptotic and scaling analyses are used to determine the leading order solutions for the wave and the boundary mode due to the non-wavy rough wall. The vortex motion is due to a source term in the system for the vortices. This source term is originated from nonlinear interactions between the wave and the boundary mode components. It is found that the wall roughness affects the wave and the vortex motion through the boundary mode. Certain roughness elements can promote secondary flow instability, while some other types of roughness elements can prevent initiation of such flow instability.
Issue Date:1999-09
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 919
Genre:Technical Report
Rights Information:Copyright 1999 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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