Characterization of Optimal LES in Turbulent Channel Flow

Abstract

The application of large eddy simulation (LES) to wall-bounded turbulent flows has be hindered by the failure of current subgrid models in the strongly inbomogeneous region very near the wall. This is the LES wall modeling problem. To address this a new modeling approach called optimal LES modeling is applied to a turbulent channel flow. Ideal LES is an LES evolution that is guaranteed to produce correct statistics and accurate short-time dynamics, and optimal LES is a minimum error approximation to it. By constructing optimal models that produce correct a priori estimates of important statistical quantities, it is shown that for inhomogeneous flows, the subgrid model must represent Reynolds stress spatial transport, in addition to transfer to small scales. Resulting models are found to perform particularly well in LES.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2001
Accession Number
ADP013641

Entities

People

  • P. Venugopal
  • R. D. Moser
  • S. Volker

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Applied Mechanics
  • Boltzmann Equation
  • Channel Flow
  • Data Science
  • Dissipation
  • Dynamics
  • Energy
  • Energy Transfer
  • Equations
  • Filters
  • Flow
  • Information Science
  • Mechanics
  • Simulations
  • Statistical Data
  • Stresses
  • Turbulent Flow

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Fluid Mechanics and Fluid Dynamics.
  • Small Business Innovation Research Program (SBIR) EDI Research and Innovation.