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NUMERICAL INVESTIGATION OF THREE-DIMENSIONAL FLUID STRUCTURES IN THE WAKE OF AN INFINITELY LONG INCLINED FLAT PLATE

Kohei Fukuda
Department of Mechanical, Automotive and Materials Engineering, University of Windsor, Windsor, Ontario, N9B 3P4, Canada

Ram Balachandar
University of Saskatchewan, Collage of Engineering, 57 Campus Drive, Saskatoon, S7N 5A9; Mechanical, Automotive and Materials Engineering, University of Windsor, Windsor, Ontario, N9B3P4, Canada; Department of Civil and Environmental Engineering, University of Windsor, Windsor, Ontario, N9B 3P4, Canada

Ron M. Barron
Department of Mechanical, Automotive & Materials Engineering, University of Windsor, Canada; Department of Mathematics and statistics, University of Windsor, Canada

DOI: 10.1615/TFEC2018.tfl.021718
pages 1859-1864


KEY WORDS: Detached Eddy Simulation, Lambda2-criterion, fluid structure, wake, CFD

Abstract

This study presents the numerical investigation of three-dimensional fluid structures that develop as air flows around an infinitely long inclined flat plate. Detached Eddy Simulation (DES) is performed at a Reynolds number of 1.57×105 based on the width of the plate and the approaching flow velocity. Vorticity contours on the two-dimensional plane at the midspan of the plate show that spanwise vortices shed from the inclined flat plate and quickly dissipate in the downstream wake. The three-dimensional iso-surface of λ2 shows the presence of streamwise vortices that develop along the braid of previously shed spanwise vortices. The spanwise wavelength of the streamwise vortices ranges from 1.36 to 1.86 times the width of the flat plate, which lies in the range corresponding to the mode B instability in wake transition defined in previous studies. The streamwise vortices get trapped between the spanwise vortices and induce instability in the spanwise vortices and the shear layer.

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