Spatial Distribution of Resonance in the Velocity Field for Transonic Flow over a Rectangular Cavity

Journal Article · Thu Jul 27 00:00:00 EDT 2017 · AIAA Journal

DOI:https://doi.org/10.2514/1.j056106· OSTI ID:1399504

Beresh, Steven J. ^[1]; Wagner, Justin L. ^[1]; Casper, Katya M. ^[1]; DeMauro, Edward P. ^[1]; Henfling, John F. ^[1]; Spillers, Russell W. ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Pulse-burst particle image velocimetry (PIV) 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 PIV 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. Spatio-temporal 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.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000; NA0003525
• OSTI ID: 1399504
• Report Number(s): SAND-2017-6329J; 654524
• Journal Information: AIAA Journal, Vol. 55, Issue 12; ISSN 0001-1452
• Publisher: AIAA
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS