Analytical Studies of Turbulent Flow Fields

Abstract

Much of the effort has been in the development of numerical simulations of unsteady, separated flow using one version of a Rotta-Kolmogorov, second moment, turbulent closure model. This has been a somewhat risky undertaking with many problems to be solved between inception of the research and success. A very good turbulent closure model has been developed to resolve important numerical problems. The turbulent Reynolds stress equations require explicit viscous terms where, indeed, the coefficient of viscosity may be set at a much lower level than the equivalent artificial viscosity introduced by the upwind scheme. Since the turbulent diffusion term that must be modeled in the Reynolds stress equations, the additional diffusion required by numerical stability seems quite tolerable. The vorticity transport equation requires no additional diffusion terms for numerical stability in which case the flow is unsteady.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1979
Accession Number
ADA214694

Entities

People

  • George L. Mellor

Organizations

  • Princeton University

Tags

Communities of Interest

  • Air Platforms
  • Human Systems

DTIC Thesaurus Topics

  • Aircraft Industry
  • Boltzmann Equation
  • Boundary Layer
  • Boundary Layer Flow
  • Computational Fluid Dynamics
  • Diffusion
  • Equations
  • Flow
  • Flow Fields
  • Fluid Dynamics
  • Layers
  • Momentum Transfer
  • Numerical Analysis
  • Turbulence
  • Turbulent Diffusion
  • Turbulent Flow
  • Viscosity

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Fluid Dynamics.
  • Fluid Mechanics and Fluid Dynamics.