Hydrodynamic Noise and Surface Compliance--An Overview of the Naval Underwater Systems Center IR/IED Program

Abstract

This Independent Research and exploratory development program on compliant surfaces is investigating turbulent flows over compliant layers to determine whether a class or classes of such layers can be devised for control and reduction of hydrodynamic (flow) noise. To accomplish this end we are addressing the coupled fluid/elastic problem to characterize the flow/layer interactions, resultant effects on the turbulent velocity components and effects both at the surface and within the layer. The motivation for the NUSC program is provided by an experiment in 1960 in which significant reductions in the turbulent boundary layer wall pressure spectra were measured on a vehicle coated with U.S. rubber 'Lamiflo'. The 'Lamiflo' coating was basically a version of a dolphin-like surface devised to extend Kramer's well known drag reductions investigations into the flow noise domain. The measured flow noise reductions have yet to be adequately explained or understood. The NUSC program seeks to develop an adequate physical framework within which the effects of compliant layers on flow noise may be understood.

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Document Details

Document Type
Technical Report
Publication Date
May 15, 1985
Accession Number
ADA157799

Entities

People

  • H. Bakewell Jr.
  • W. A. Von Winkle

Organizations

  • Naval Underwater Systems Center

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Boundary Layer
  • Detectors
  • Drag Reduction
  • Elastic Properties
  • Flow
  • Flow Noise
  • Fluid Mechanics
  • Frequency
  • Geometry
  • Hydrophones
  • Layers
  • Measurement
  • Mechanics
  • Noise Reduction
  • Shear Stresses
  • Turbulent Boundary Layer
  • Turbulent Flow

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Fluid Mechanics and Fluid Dynamics.