Pressure Cross Spectra in Turbulent Boundary Layers in Water.

Abstract

The spectrum (power spectral density) of the vibration level for any linear system can be found by integrating the product of the cross spectrum of the excitation with the cross frequency response functions of the system over the area on which the excitation is acting. Measurements of the auto and cross spectra of the wall pressure fluctuations in a water tunnel are presented. It is shown that the cross spectra cannot be expressed as a product of functions of the streamwise and transverse coordinates alone but must include interaction terms. One possible parametric approximation is suggested. Keywords: Hydroacoustics; Cross spectra; Fluid solid interaction.

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Document Details

Document Type
Technical Report
Publication Date
Feb 14, 1985
Accession Number
ADA156153

Entities

People

  • N. Narayan
  • R. Plunkett

Organizations

  • University of Minnesota

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Acoustic Fields
  • Background Noise
  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Flow
  • Fluid Dynamics
  • Frequency
  • Frequency Response
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Noise
  • Reynolds Number
  • Stratified Fluids
  • Turbulent Boundary Layer
  • Wind Tunnels

Fields of Study

  • Engineering
  • Physics

Readers

  • Approximation Theory.
  • Computational Fluid Dynamics (CFD)
  • Fluid Mechanics and Fluid Dynamics.