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RESEARCH PAPERS

Dynamics of Large-Scale Structures for Jets in a Crossflow

[+] Author and Article Information
F. Muldoon, S. Acharya

Mechanical Engineering Department, Louisiana State University, Baton Rouge, LA 70803

J. Turbomach 121(3), 577-587 (Jul 01, 1999) (11 pages) doi:10.1115/1.2841355 History: Received February 01, 1998; Online January 29, 2008

Abstract

Results of a three-dimensional unsteady computational study of a row of jets injected normal to a crossflow are presented with the aim of understanding the dynamics of the large-scale structures in the region near the jet. The jet to crossflow velocity ratio is 0.5. A modified version of the computer program (INS3D), which utilizes the method of artificial compressibility, is used for the computations. Results obtained clearly indicate that the near-field large-scale structures are extremely dynamic in nature, and undergo breakup and reconnection processes. The dynamic near-field structures identified include the counterrotating vortex pair (CVP), the horseshoe vortex, wake vortex, wall vortex, and shear layer vortex. The dynamic features of these vortices are presented in this paper. The CVP is observed to be a convoluted structure interacting with the wall and horseshoe vortices. The shear layer vortices are stripped by the crossflow, and undergo pairing and stretching events in the leeward side of the jet. The wall vortex is reoriented into the upright wake system. Comparison of the predictions with mean velocity measurements is made. Reasonable agreement is observed.

Copyright © 1999 by The American Society of Mechanical Engineers
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