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RESEARCH PAPERS

Scrutinizing the k-ε Turbulence Model Under Adverse Pressure Gradient Conditions

[+] Author and Article Information
W. Rodi

University of Karlsruhe, Karlsruhe, FRG

G. Scheuerer

University of Erlangen-Nürnberg, Erlangen, FRG

J. Fluids Eng 108(2), 174-179 (Jun 01, 1986) (6 pages) doi:10.1115/1.3242559 History: Received February 10, 1984; Online October 26, 2009

Abstract

The k-ε model and a one-equation model have been used to predict adverse pressure gradient boundary layers. While the one-equation model gives generally good results, the k-ε model reveals systematic discrepancies, e.g. too high skin friction coefficients, for these relatively simple flows. These shortcomings are examined and it is shown by an analytical analysis for the log-law region that the generation term of the ε-equation has to be increased to conform with experimental evidence under adverse pressure gradient conditions. A corresponding modification to the ε-equation emphasizing the generation rate due to deceleration was employed in the present investigation and resulted in improved predictions for both moderately and strongly decelerated flows.

Copyright © 1986 by ASME
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