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Stochastic Estimation and Non-Linear Wall-Pressure Sources in a Separating/Reattaching Flow

[+] Author Affiliations
A. Naguib, L. Hudy

Michigan State University, East Lansing, MI

W. M. Humphreys, Jr.

NASA Langley Research Center, Hampton, VA

Paper No. FEDSM2002-31418, pp. 1211-1216; 6 pages
doi:10.1115/FEDSM2002-31418
From:
  • ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
  • Volume 2: Symposia and General Papers, Parts A and B
  • Montreal, Quebec, Canada, July 14–18, 2002
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3616-9 | eISBN: 0-7918-3600-2
  • Copyright © 2002 by ASME

abstract

Simultaneous wall-pressure and PIV measurements are used to study the conditional flow field associated with surface-pressure generation in a separating/reattaching flow established over a fence-with-splitter-plate geometry. The conditional flow field is captured using linear and quadratic stochastic estimation based on the occurrence of positive and negative pressure events in the vicinity of the mean reattachment location. The results shed light on the dominant flow structures associated with significant wall-pressure generation. Furthermore, analysis based on the individual terms in the stochastic estimation expansion shows that both the linear and non-linear flow sources of the coherent (conditional) velocity field are equally important contributors to the generation of the conditional surface pressure.

Copyright © 2002 by ASME

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