RESEARCH PAPERS: Noise Control and Acoustics

A Mapped Finite Difference Study of Noise Propagation in Nonuniform Ducts With Mean Flow

[+] Author and Article Information
Peter E. Raad

Department of Civil and Mechanical Engineering, Southern Methodist University, Dallas, Texas 75275

James W. White

Department of Mechanical and Aerospace Engineering, The University of Tennessee, Knoxville, Knoxville, Tennessee 37996-2210

J. Vib., Acoust., Stress, and Reliab 109(4), 372-380 (Oct 01, 1987) (9 pages) doi:10.1115/1.3269456 History: Received April 01, 1987; Online November 23, 2009


The primary objective of this work is to study noise propagation in acoustically lined variable area ducts with mean fluid flow. The method of study is numerical in nature and involves a body-fitted grid mapping procedure in conjunction with a factored-implicit finite difference technique. The mean fluid flow model used is two-dimensional, inviscid, irrotational, incompressible, and nonheat conducting. Fully-coupled solutions of the linearized gas dynamic equations are obtained for both positive and negative Mach numbers as well as for hard and soft wall conditions. The factored-implicit finite difference technqiue used did give rise to short wavelength perturbations, but these were dampened by the introduction of higher order artificial dissipation terms into the scheme. Results compared favorably with available numerical and experimental data.

Copyright © 1987 by ASME
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