Application of Wavelet-Filtering Techniques to Intermittent Turbulent and Wall Pressure Events. Part 1. Exploratory Results

Abstract

Large amplitude wall-pressure events, observed beneath a turbulent boundary layer, appear to be the signatures of intermittent organized motions within the turbulent flow. The temporal localization of these events could be applied to the active control of turbulent wall flows. This report presents preliminary results on utilizing time-frequency localization techniques (wavelet transforms) for the detection of these events. The advantage of these methods is that they do not require a priori assumptions regarding the features of the signal. A tutorial overview of these techniques is first presented. This is followed by a discussion of some exploratory results obtained from the application of wavelet filtering to wall pressure and turbulent temporal records acquired from wind tunnel experiments. Wavelet filtering, Wall-pressure fluctuations, Turbulence time-frequency localization, Conditional sampling.

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Document Details

Document Type
Technical Report
Publication Date
Oct 25, 1994
Accession Number
ADA286077

Entities

People

  • Mario J. Casarella
  • Mark Kammeyer
  • Pablo B. Penafiel

Organizations

  • The Catholic University of America

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Algorithms
  • Boundary Layer
  • Cross Correlation
  • Detection
  • Engineering
  • Filters
  • Filtration
  • Flow
  • Fluid Dynamics
  • Fluid Mechanics
  • Frequency
  • Frequency Bands
  • Frequency Domain
  • Turbulent Boundary Layer
  • Turbulent Flow
  • Universities
  • Wavelet Transforms

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Combustion and Flow Dynamics.
  • Image Processing and Computer Vision.