Spatial distribution of resonance in the velocity field for transonic flow over a rectangular cavity

Steven J. Beresh, Justin L. Wagner, Katya M. Casper, Edward P. DeMauro, John F. Henfling, Russell W. Spillers

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Pulse-burst particle image velocimetry has been used to acquire time-resolved data at 37.5 kHz of the flow over a finite-width rectangular cavity at Mach 0.8. Power spectra of the particle image velocimetry data reveal four resonance modes that match the frequencies detected simultaneously using high-frequency wall pressure sensors, but whose magnitudes exhibit spatial dependence throughout the cavity. Spatiotemporal cross correlations of velocity to pressure were calculated after bandpass filtering for specific resonance frequencies. Cross-correlation magnitudes express the distribution of resonance energy, revealing local maxima and minima at the edges of the shear layer attributable to wave interference between downstream-and upstream-propagating disturbances. Turbulence intensities were calculated using a triple decomposition and are greatest in the core of the shear layer for higher modes, where resonant energies ordinarily are lower. Most of the energy for the lowest mode lies in the recirculation region and results principally from turbulence rather than resonance. Together, the velocity-pressure cross correlations and the triple-decomposition turbulence intensities explain the sources of energy identified in the spatial distributions of power spectra amplitudes.

Original languageEnglish (US)
Pages (from-to)4203-4218
Number of pages16
JournalAIAA journal
Volume55
Issue number12
DOIs
StatePublished - Jan 1 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Fingerprint Dive into the research topics of 'Spatial distribution of resonance in the velocity field for transonic flow over a rectangular cavity'. Together they form a unique fingerprint.

  • Cite this

    Beresh, S. J., Wagner, J. L., Casper, K. M., DeMauro, E. P., Henfling, J. F., & Spillers, R. W. (2017). Spatial distribution of resonance in the velocity field for transonic flow over a rectangular cavity. AIAA journal, 55(12), 4203-4218. https://doi.org/10.2514/1.J056106