Flow-Structure Interaction Noise at Low Mach Numbers

Abstract

The method of compact Green's functions is described for calculating the sound produced by low Mach number turbulence interacting with a surface and by surfaces in relative motion. The method is very powerful and can supply analytical predictions of complex fluid-structure interaction noise, and can also be used to make acoustic predictions by postprocessing' data obtained from a numerical simulation of a hydrodynamic interaction. The theory is illustrated by cases of sound production by a vortex interacting with a sphere, by the linear and nonlinear theories of parallel vortex-airfoil interaction noise, the trailing edge noise produced by an airfoil of finite thickness and of arbitrary chord, and by the compression wave generated when a projectile is fired into a long duct.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2003
Accession Number
ADP014106

Entities

People

  • M. S. Howe

Organizations

  • Boston University

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustics
  • Amplitude
  • Boundary Layer
  • Compression Waves
  • Far Field
  • Flow
  • Frequency
  • Incompressible Flow
  • Leading Edges
  • Mach Number
  • Pressure Measurement
  • Reflection
  • Reynolds Number
  • Trailing Edges
  • Turbulent Mixing
  • Waves

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Fluid Dynamics.
  • Fluid Mechanics and Fluid Dynamics.