Structural Parameters and Prediction of Adverse Pressure Gradient Turbulent Flows: An Improved k-ε Model

[+] Author and Article Information
G. Chukkapalli, Ö. F. Turan

Mechanical Engineering Department, Middle East Technical University, Ankara 06531 Turkey

J. Fluids Eng 117(3), 424-432 (Sep 01, 1995) (9 pages) doi:10.1115/1.2817279 History: Received September 03, 1992; Revised March 21, 1994; Online December 04, 2007


A modified k-ε model is proposed to predict complex, adverse pressure gradient, turbulent diffuser flows. The need for an eddy viscosity is eliminated by using three structural parameters. A fuller treatment of the rate of kinetic diffusion terms is incorporated with a Reynolds stress model representation. A thorough evaluation is given of the three structural parameters in three decreasing and one increasing adverse pressure gradient diffuser flows leading to a three-layer representation. The results indicate the need for better modeling of the ε-equation.

Copyright © 1995 by The American Society of Mechanical Engineers
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