文档介绍：第卷第期船舶力学
13 6
年月
2009 12 Journal of Ship Mechanics Dec. 2009
Article ID: 1007-7294(2009)06-0990-12
LES Method for Investigation of Noise Generated by
Turbulent Boundary Layer
PAN Yu-cun1, 2, ZHANG Huai-xin1
(1 State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;
2 Department of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan
430033, China)
Abstract: Large Eddy Simulation (LES) was used to investigate space-time field of the low Mach
number, fully developed turbulent boundary layer on a smooth, rigid flat plate. The flowfield simu-
lated by LES was taken as near-field sound sources and radiated sound from turbulent boundary
layer (TBL) was studied using Lighthill’s acoustics analogy. The radiated sound of dipole type, of
quadrupole type, and of the sum of the two above were discussed. Comparing their power spectral
densities, it is concluded that in low Mach number, the wall shear stress (dipole type of source) is
the predominant factor responsible for sound radiation from TBL.
Key words: turbulent boundary layer; hydroacoustics; large eddy simulation;
Lighthill’s acoustic analogy
CLC number: Document code: A
1 Introduction
The sound generated by turbulence is an important part of flow-generated pas-
sengers in aircrafts and automobiles always suffer from the past,the jet noise was be-
lieved to be dominant in aircraft noise,and the turbulent noise was considered secondary.
However, panying the progress in jet-engine construction, material and design to con-
trol jet-noise over recent years,the airframe turbulence -noise problem has received an in-
creasing amount of attention.
In classical acoustic problems,the sound wave was induced by the mechanical vibration
of particular fluid was only the medium of acoustic wave propagation. However, the
objective of this study is to investigate the sound