Multi-point measurement techniques used in the study of separated flows

Sheldon D. Stokes, Mark N Glauser

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

A rake of flying crosswire probes as well as several stationary hot-wire probes has been used to examine the spatial and temporal evolution of the backward facing step flow. The back-step flow is a fundamental separated turbulent flowfield, many complex separated flow geometries can be modeled using the backstep flowfield. A greater understanding of the flow physics of fundamental separated flows can lead to more efficient schemes for controlling the characteristics of this class of flow. Two hotwire experiments were conducted, the first experiment used flying rakes of hotwire probes to measure the time averaged spatial correlations. The second experiment used stationary hot-wire probes to capture temporal information at certain locations in the flow. Proper Orthogonal Decomposition (POD) was used as an unbiased technique for extracting structures from this coherent flow. This technique decomposes the flow into modes on an energy weighted basis. The kernel of this technique is the two point correlation tensor. POD is a very robust technique for extracting spatial information about the flow. Linear Stochastic Estimation (LSE) can be used to estimate the flowheld at certain locations within the integral scale given the two-point spatial correlation tensor, and temporal information at known positions within the flowheld. The two techniques’can be combined to yield an experimental low dimensional model of the flowheld. The coefficients of this model can be used in a physics based control scheme.

Original languageEnglish (US)
Title of host publication30th Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9780000000002
StatePublished - 1999
Externally publishedYes
Event30th Fluid Dynamics Conference, 1999 - Norfolk, United States
Duration: Jun 28 1999Jul 1 1999

Other

Other30th Fluid Dynamics Conference, 1999
CountryUnited States
CityNorfolk
Period6/28/997/1/99

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Stokes, S. D., & Glauser, M. N. (1999). Multi-point measurement techniques used in the study of separated flows. In 30th Fluid Dynamics Conference [AIAA 99-3518] American Institute of Aeronautics and Astronautics Inc, AIAA.