Numerical Study of a Three-Dimensional Turbulent Boundary Layer

Abstract

The effects of transverse strain on an initially two-dimensional turbulent boundary layer are studied in a direct numerical simulation of a planar channel flow with impulsively started transverse pressure gradient. Consistent with experiments in three-dimensional boundary layers, the simulation shows a decrease in the Reynolds shear stress with increasing transverse strain. Also, the directions of the Reynolds shear stress vector and the mean velocity gradient vector were found to differ. In addition, the simulation shows a drop in the turbulent kinetic energy. Terms in the Reynolds stress transport equations were computed. The balances indicate that the decrease in turbulent kinetic energy is a result of a decrease in turbulence production, along with an increase in turbulent dissipation. The effects of the transverse pressure gradient on the instantaneous flow structures were investigated.

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Document Details

Document Type
Technical Report
Publication Date
Aug 31, 1990
Accession Number
ADA227835

Entities

People

  • Parviz Moin

Organizations

  • Stanford University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boltzmann Equation
  • Boundary Layer
  • Channel Flow
  • Computational Fluid Dynamics
  • Equations
  • Flow
  • Fluid Dynamics
  • Kinetic Energy
  • Layers
  • Pressure Gradients
  • Shear Stresses
  • Simulations
  • Statistical Analysis
  • Three Dimensional
  • Turbulence
  • Turbulent Boundary Layer
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Ocean-Atmosphere Mesoscale Modeling, Data Assimilation, and Flux Boundary Layers
  • Structural Dynamics.