Dynamic non-equilibrium wall-modeling for large eddy simulation at high Reynolds numbers

Soshi Kawai, Johan Larsson

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)

Abstract

A dynamic non-equilibrium wall-model for large-eddy simulation at arbitrarily high Reynolds numbers is proposed and validated on equilibrium boundary layers and a non-equilibrium shock/boundary-layer interaction problem. The proposed method builds on the prior non-equilibrium wall-models of Balaras et al. [AIAA J.34, 1111-1119 (1996)]10.2514/3.13200 and Wang and Moin [Phys. Fluids14, 2043-2051 (2002)]10.1063/1.1476668: the failure of these wall-models to accurately predict the skin friction in equilibrium boundary layers is shown and analyzed, and an improved wall-model that solves this issue is proposed. The improvement stems directly from reasoning about how the turbulence length scale changes with wall distance in the inertial sublayer, the grid resolution, and the resolution-characteristics of numerical methods. The proposed model yields accurate resolved turbulence, both in terms of structure and statistics for both the equilibrium and non-equilibrium flows without the use of adhoc corrections. Crucially, the model accurately predicts the skin friction, something that existing non-equilibrium wall-models fail to do robustly.

Original languageEnglish
Article number015105
JournalPhysics of Fluids
Volume25
Issue number1
DOIs
Publication statusPublished - 2013 Jan 2
Externally publishedYes

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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