A Turbulence Model for Recirculating Flow

Abstract

A simple adjustment is proposed that improves the predictions of the standard k-epsilon turbulence model in the presence of two-dimensional recirculating flow. An eddy Reynolds number calculated from velocity, vorticity, and eddy viscosity is introduced as a scaling parameter for reducing the decay term in the governing equation for the turbulence-energy dissipation rate. Using the adjusted k-epsilon model to compute the flow past a backstep (channel expansion), the STEMR finite-difference code gives better predictions for streamlines, velocities, and turbulence energies than it does with the standard k-epsilon model. Computed reattachment lengths compare well with experimental data for channel expansion ratios between 1 and 2.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1991
Accession Number
ADA241355

Entities

People

  • Robert S. Bernard

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Computers
  • Engineers
  • Equations
  • Experimental Data
  • Flow
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Incompressible Flow
  • Mechanical Properties
  • Mechanics
  • Reynolds Number
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Fluid Mechanics and Fluid Dynamics.