Understanding Nonlinear Coherent Structure Interactions in Boundary-Layer Transition using Adaptive Signal Analysis

Abstract

Major Goals: The high-level objectives of the research program included: 1. Develop a multivariate, multi-dimensional empirical mode decomposition processing method capable of performing scale separation of three-dimensional, three-component velocity fields. 2. Extract multi-scale contributions of turbulent fluctuations in a transitional boundary layer using adaptive modal decomposition 3. Determine amplitude, phase, and frequency/wavenumber evolution of unsteady modes throughout transition and relate to physical characteristics of nonlinear breakdown to turbulent flow.

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Document Details

Document Type
Technical Report
Publication Date
Oct 19, 2021
Accession Number
AD1204252

Entities

People

  • Phillip J. Ansell

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Boundary Layer
  • Boundary Layer Flow
  • Boundary Layer Transition
  • Channel Flow
  • Coefficients
  • Computational Fluid Dynamics
  • Energy
  • Engineering
  • Flow Fields
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Mechanics
  • Modal Analysis
  • Order Statistics
  • Reynolds Number
  • Signal Processing
  • Skin Friction
  • Stratified Fluids
  • Three Dimensional
  • Turbulence
  • Turbulent Flow
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Fluid Mechanics and Fluid Dynamics.
  • Statistical inference.