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TECHNICAL BRIEFS

The Effect of Negative Spanwise Rotation on Dean Vortices

[+] Author and Article Information
Liqiu Wang

Department of Mechanical Engineering, University of Hong Kong, Hong Kong

J. Fluids Eng 119(3), 718-721 (Sep 01, 1997) (4 pages) doi:10.1115/1.2819305 History: Received July 11, 1996; Revised March 27, 1997; Online December 04, 2007

Abstract

A finite-volume numerical analysis is performed to examine effect of spanwise rotation on Dean vortices. The specific problem considered is fully developed flow in a square channel with streamwise curvature and spanwise rotation in a negative sense, i.e., the Coriolis force counteracts the centrifugal force. The rotation of the channel is found to have a significant effect on the flow structure in general, and the Dean vortices in particular. The nonlinear interaction of the Coriolis instability and the centrifugal instability results in several new flow structures, including one with coexistence of Ekman, Dean, and corner vortices, one with coexistence of Ekman and corner vortices, one with one-pair vortices and an agostrophic, virtually inviscid core, and one with Coriolis vortices on the inner convex wall. These are in agreement with the experimental findings.

Copyright © 1997 by The American Society of Mechanical Engineers
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