Wall-Cavity Aeroacoustics at Low Mach Number

Abstract

Theoretical and numerical analyses are made of the mechanism of sound production by nominally steady low Mach number flow over a rigid shallow wall cavity. At very low Mach numbers the dominant source of sound is the unsteady drag, and the aeroacoustic dipole source accompanying this force. A monopole source dependent on the compression of fluid within the cavity is smaller by a factor of the order of the flow Mach number M. However, numerical simulations for M as small as 0.1 have predicted significant radiation in directions normal to the wall. This anomaly is investigated by using an acoustic Green's function tailored to cavity geometry. The Green's function is extended to examine the production of sound by vortex shedding at lock-on' from a cross-beam adjacent

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Document Details

Document Type
Technical Report
Publication Date
Jan 03, 2004
Accession Number
ADA419580

Entities

People

  • Michael S. Howe

Organizations

  • Boston University

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Flow
  • Fluid Dynamics
  • Fluid Mechanics
  • Geometry
  • Incompressible Flow
  • Mach Number
  • Numerical Analysis
  • Pressure Distribution
  • Pressure Signatures
  • Simulations
  • Steady Flow
  • Turbulent Mixing
  • Two Dimensional
  • Vortex Shedding

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Fluid Mechanics and Fluid Dynamics.
  • Pulsed Power and Plasma Physics.