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RESEARCH PAPERS: Noise Control and Acoustics

Instability and Sound Emission From a Flow Over a Curved Surface

[+] Author and Article Information
L. Maestrello

NASA Langley Research Center, Hampton, Virginia

P. Parikh

Vigyan Research Associates, Inc., Hampton, Virginia

A. Bayliss

Northwestern University, Evanston, Illinois

J. Vib., Acoust., Stress, and Reliab 110(4), 538-544 (Oct 01, 1988) (7 pages) doi:10.1115/1.3269563 History: Received September 15, 1987; Online November 23, 2009

Abstract

The growth and decay of a wavepacket convecting in a boundary layer over a concave-convex surface is studied numerically using direct computations of the Navier-Stokes equations. The resulting sound radiation is computed using the linearized Euler equations with the pressure from the Navier-Stokes solution as a time-dependent boundary condition. It is shown that on the concave portion the amplitude of the wavepacket increases and its bandwidth broadens while on the convex portion some of the components in the packet are stabilized. The pressure field decays exponentially away from the surface and then algebraically exhibiting a decay characteristic of acoustic waves in two dimensions. The far field acoustic pressure exhibits a peak at a frequency corresponding to the inflow instability frequency.

Copyright © 1988 by ASME
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