Hydrodynamic Noise from Flexible Roughness Elements

Abstract

The influence of a poroelastic surface structure composed of elastic fibers, as inspired by the wings of silent owl species, is investigated theoretically through the development of two mathematical models. First, in the spatial limit of a sparse distribution of fibers that are hydrodynamically uncoupled, the influences of fiber bending and a background flow on the far field sound are studied using conformal mapping. A second model reveals how the porous surface structure can suppress pressure fluctuations, which agrees well with companion experiments performed by Dr. William Devenport of Virginia Tech.

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Document Details

Document Type
Technical Report
Publication Date
Jun 29, 2015
Accession Number
ADA622149

Entities

People

  • Conor Daly
  • Justin W Jaworski
  • Nigel Peake

Organizations

  • Lehigh University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Boundary Layer
  • Cartography
  • Conformal Mapping
  • Elastic Properties
  • Equations
  • Far Field
  • Fluid Dynamics
  • Fluid Flow
  • Frequency
  • Hydrodynamics
  • Mathematical Analysis
  • Physics
  • Roughness
  • Trailing Edges
  • Turbulent Mixing
  • Two Dimensional
  • Virginia

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Research Science/Academic Research