Energy Transfers and Spectral Eddy Viscosity in Large-Eddy Simulations of Homogeneous Isotropic Turbulence: Comparison of Dynamic Smagorinsky and Multiscale Models Over a Range of Discretizations

Abstract

Energy transfers within LES and DNS grids are studied. The spectral eddy viscosity for conventional dynamic Smagorinsky and variational multiscale LES methods are compared with DNS results. Both models underestimate the DNS results for a very coarse LES, but the dynamic Smagorinsky model is significantly better. For moderately to well-refined LES, the dynamic Smagorinsky model overestimates the spectral eddy viscosity at low wave numbers. The multiscale model is in good agreement with DNS for these cases. The convergence of the multiscale model to the DNS with grid refinement is more rapid than for the dynamic Smagorinsky model.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2004
Accession Number
ADA438241

Entities

People

  • Alan A. Wray
  • Garth N. Wells
  • Thomas J.R. Hughes

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Civil Engineering
  • Computational Science
  • Energy
  • Energy Transfer
  • Flow
  • Large Eddy Simulation
  • Mechanical Properties
  • Mechanics
  • Models
  • Multiscale Models
  • Numerical Analysis
  • Physics
  • Reynolds Number
  • Simulations
  • Stratified Fluids
  • Turbulence
  • Viscosity

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Ocean-Atmosphere Mesoscale Modeling, Data Assimilation, and Flux Boundary Layers