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Large-Eddy Simulation of Near-Wall Turbulence

  • C. Härtel
  • L. Kleiser
Part of the Notes on Numerical Fluid Mechanics (NNFM) book series (NONUFM, volume 48)

Summary

The present paper summarizes results from a numerical study conducted in order to clarify the requirements for the large-eddy simulation of near-wall turbulence. A key finding of the study is that an inverse cascade of turbulent kinetic energy from small to large scales exists within the buffer layer which cannot be accounted for by currently applied subgrid models. This may lead to significant errors in large-eddy simulations when the wall layer is resolved. Therefore a new model for the eddy viscosity is proposed which is more consistent with the near-wall physics than are the models commonly employed. A priori tests of this new model show promising results. The present investigation is primarily based on direct numerical simulation data of turbulent channel flow at various low Reynolds numbers. However, no significant Reynolds-number effects were observed which suggests that the findings may essentially be generalized to flows at higher Reynolds numbers.

Keywords

Eddy Viscosity Turbulent Channel Flow Direct Numerical Simulation Data Wall Unit Direct Numerical Simulation Result 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Friedr. Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig/Wiesbaden 1996

Authors and Affiliations

  • C. Härtel
    • 1
  • L. Kleiser
    • 1
  1. 1.Institute of Fluid Dynamics, Swiss Federal Institute of TechnologyZürichSwitzerland

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