A Near-Wall Model for Separated Turbulent Flows

[+] Author and Article Information
U. C. Goldberg

Rockwell International Science Center, Thousand Oaks, CA 91360

J. Fluids Eng 114(4), 694-697 (Dec 01, 1992) (4 pages) doi:10.1115/1.2910089 History: Received January 30, 1992; Online May 23, 2008


A near-wall model for separated turbulent flows is presented and evaluated. The model is based on experimental observations, in particular, the wake-like behavior of turbulence away from walls, the influence of walls on this behavior, the diffusion/dissipation energy balance observed in the backflow portion of detached flow regions, and the near-wall behavior of eddy-viscosity. These lead to two analytically solvable ODE’s for the normal-to-wall behavior of turbulence kinetic energy and eddy-viscosity. The model is applied in conjunction with an outer eddy-viscosity model (such as a k–ε model) to predict eddy-viscosity distribution in separated flow regions. Predictions of two flow cases, using this approach, are shown.

Copyright © 1992 by The American Society of Mechanical Engineers
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