Structure-Based Turbulence Model

Abstract

During the period of this award, the basic structure-based model for rapid distortions of homogeneous turbulence was extended to deal with slow distortions and inhomegeneities. A computer program was written to study the extended model in free-shear flows. The model was installed in NASA's INS2D code for generalized flow analysis. Mr. Maire carried out this work as part of his Phi) research. During the award period we began to explore ways to simplify the structure-based modeling so that it could be used in repetitive engineering calculations. The idea is to use an algebraic version of the model that, gives the turbulent, stresses in terms of the mean strain rate and mean and frame rotation rates as an alternative to the linear or non linear stress strain relationships used in conventional two equation modeling. The difference would be that the algebraic structure-based turbulence model (ASBM) would do a much better job of representing the stresses in complex flows. Development of this concept into a working engineering model and codes will be the principal objective under subsequent awards.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 22, 2000
Accession Number
ADA385334

Entities

People

  • William C. Reynolds

Organizations

  • Stanford University

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Boltzmann Equation
  • Computational Fluid Dynamics
  • Computer Programs
  • Computers
  • Distortion
  • Engineering
  • Engineers
  • Equations
  • Flow
  • Fluid Dynamics
  • Fluid Mechanics
  • Mechanical Engineering
  • Mechanics
  • Physics
  • Propulsion Systems
  • Strain Rate
  • Turbulence

Readers

  • Computational Modeling and Simulation
  • Fluid Mechanics and Fluid Dynamics.
  • Technical Research and Report Writing.