University of Illinois Urbana-Champaign

Boundary mode-vortex interaction in turbulent channel flow over non-wavy rough wall

Riahi, Daniel N.

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https://hdl.handle.net/2142/112627

Description

Title
Boundary mode-vortex interaction in turbulent channel flow over non-wavy rough wall
Author(s)
Riahi, Daniel N.
Issue Date
1999-09
Keyword(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.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 919
  • 1999-6021
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112627
Copyright and License Information
Copyright 1999 Board of Trustees of the University of Illinois

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Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
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.