Optimal LES and a New Near-Wall Model for Application to High-Reynolds-Number Air Foils

Abstract

Three primary results of research to extend applicability of optimal large eddy simulation (OLES) to general wall-bounded flows are reported. These are: 1) the formulation and testing of theoretically-based OLES, in which theory for multi-point velocity correlations replaces empirical data as input to the model; 2) development of anisotropic models of the two-point correlation for use in wall-bounded OLES; and, 3) generalization and testing of finite-volume OLES formulations to wall-bounded turbulence. It was found that theoretically-based OLES performs very well. The anisotropy representation was formulated in terms of structure tensors, and this also provided a very good representation of the anisotropy in wall-bounded turbulence. But the approach was judged to be too complex for use with the correlations needed in OLES, and a simpler approach is proposed. Finally, the finite-volume OLES for wall-bounded turbulence resulted in a problem that arises from the treatment of the pressure and incompressibility. A new OLES formulation designed to address this has been developed and is being tested.

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Document Details

Document Type
Technical Report
Publication Date
Apr 07, 2010
Accession Number
ADA523362

Entities

People

  • Robert D. Moser

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Anisotropy
  • Boundary Layer
  • Channel Flow
  • Computer Programs
  • Convection
  • Equations
  • Fluid Dynamics
  • Fluid Flow
  • Large Eddy Simulation
  • Layers
  • Mechanical Engineering
  • Reynolds Number
  • Simulations
  • Three Dimensional
  • Turbulence
  • Turbulent Flow
  • Turbulent Mixing

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Fluid Mechanics and Fluid Dynamics.
  • Ocean-Atmosphere Mesoscale Modeling, Data Assimilation, and Flux Boundary Layers