The Role Of Kinetic Fluctuations in Laminar-Turbulent Transition of High-Speed Boundary-Layer Flows

Abstract

Kinetic fluctuations on molecular level (thermal noise) may generate fluctuating dissipative fluxes (momentum, heat, diffusion, species production) that are included into the governing gas flow equations. The fluctuating fluxes are the stochastic Langevin forces that may generate unstable discrete modes in boundary layers. Receptivity of high-speed boundary layers to the stochastic forcing is analyzed, and potential impact of the phenomenon on laminar-turbulent transition is explored. It was shown that the receptivity is localized in the critical layer, where fluctuating shear stress plays major role in the receptivity mechanism.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 28, 2018
Accession Number
AD1085593

Entities

People

  • Anatoli Tumin

Organizations

  • University of Arizona

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Waves
  • Boundary Layer
  • Boundary Layer Control
  • Boundary Layer Flow
  • Chemical Reactions
  • Computational Fluid Dynamics
  • Computational Science
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Gas Flow
  • Hydrodynamics
  • Mechanical Properties
  • Physics Laboratories
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

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