Limitations of the Boundary-Layer Equations for Predicting Laminar Symmetric Sudden Expansion Flows

[+] Author and Article Information
J. P. Lewis, R. H. Pletcher

Department of Mechanical Engineering and Computational Fluid Dynamics Center, Iowa State University, Ames, Iowa 50011

J. Fluids Eng 108(2), 208-213 (Jun 01, 1986) (6 pages) doi:10.1115/1.3242564 History: Received January 22, 1985; Online October 26, 2009


A finite-difference solution scheme is used to study the limitations and capabilities of the boundary-layer equation model for flow through abrupt, symmetric expansions. Solutions of the boundary-layer equations are compared with previous numerical predictions and experimental measurements. Some flow parameters are not well predicted for Reynolds numbers below 200. Global iteration over the flow field to include upstream effects does not significantly influence the predictions. Axisymmetric and two-dimensional flows are investigated. The effect of initial conditions is discussed

Copyright © 1986 by ASME
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