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LES and Unsteady RANS Computations for a Periodically-Perturbed Separated Flow Over a Backward-Facing Step

[+] Author Affiliations
Anne Dejoan, Yong-Jun Jang, Michael A. Leschziner

Imperial College London, London, UK

Paper No. HT-FED2004-56211, pp. 469-476; 8 pages
doi:10.1115/HT-FED2004-56211
From:
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 2, Parts A and B
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4691-1 | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME

abstract

Large eddy simulation and statistical turbulence closure are used to investigate and contrast the ability of both strategies to represent the effects arising from the unsteady perturbation of a separated backward-facing-step flow by means of a slot jet injected periodically at zero net mass-flow rate into the flow at the step edge at an angle of 45 degrees relative to the flow direction. Experimental data show the effects to depend non-linearly on the perturbation frequency, the strongest response arising at a Strouhal number of 0.2, which is the condition investigated herein. The principal response is a shortening of the separation bubble by almost 30%, a result that is highly pertinent to active flow control. As the injection frequency lies within the low-frequency range of the large scales of the turbulence spectrum, an issue of particular interest that is addressed is the ability of the statistical models, operating within a phase-averaged URANS framework, to reproduce the experimental observations and the response derived from the simulation.

Copyright © 2004 by ASME

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