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Unsteady Fluid Dynamics in a Semi-Closed Cavity

[+] Author Affiliations
Antonio Filippone

UMIST, Manchester, UK

Jess A. Michelsen

Technical University of Denmark, Lyngby, Denmark

Paper No. HT-FED2004-56225, pp. 477-486; 10 pages
doi:10.1115/HT-FED2004-56225
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

Results are presented for unsteady, time-true simulations of a shear driven cavity started impulsively from rest. The cavity is partially occluded by slits on its upper side, thereby forming a Helmholtz resonator type of geometry. Simulations with Reynolds-averaged Navier-Stokes solvers at the laminar Reynolds number Re = 3,000, for a spanwise aspect-ratio equal to 3, showed that the flow is unsteady and a-periodic over a normalised time of one hundred units. Taylor-Görtler spanwise vortices appear early in the simulation (flow time 3 or 4 units); these vortices have a relatively short time span, and completely disappear at a flow time equal to 90. This study also reports about the findings on the secondary eddies (upstream and wall vortices), on the vortex filaments that are drawn from the cavity floor, and on the mass transport properties of the flow.

Copyright © 2004 by ASME

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