A hybrid LES/RANS approach using an anisotropy-resolving algebraic turbulence model

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Abstract

In order to derive a possible path for developing a large eddy simulation (LES) applicable to high Reynolds-number turbulent flows, a hybrid approach connecting LES with the Reynolds-averaged Navier-Stokes (RANS) modeling in the near-wall region is studied. In contrast to most of the previous studies that have employed linear eddy-viscosity models, in this study, an advanced non-linear eddy-viscosity model is introduced to resolve the near-wall stress anisotropy more correctly. To investigate the model performance in detail, the proposed model is applied to fully-developed plane channel flows with various grid resolutions and at various Reynolds numbers. The grid resolution in the streamwise (x) and spanwise (z) directions ranges from 101 to 103 in wall unit (Δx+ or Δz+), while ywall+∼1 in the wall-normal (y) direction. The present model provides encouraging results for further development of this kind of hybrid LES/RANS model.

Original languageEnglish
Pages (from-to)204-222
Number of pages19
JournalInternational Journal of Heat and Fluid Flow
Volume26
Issue number2
DOIs
Publication statusPublished - Apr 1 2005

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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