Turbulence intensities in large-eddy simulation of wall-bounded flows

H. J. Bae, A. Lozano-Durán, S. T. Bose, and P. Moin
Phys. Rev. Fluids 3, 014610 – Published 22 January 2018

Abstract

A persistent problem in wall-bounded large-eddy simulations (LES) with Dirichlet no-slip boundary conditions is that the near-wall streamwise velocity fluctuations are overpredicted, while those in the wall-normal and spanwise directions are underpredicted. The problem may become particularly pronounced when the near-wall region is underresolved. The prediction of the fluctuations is known to improve for wall-modeled LES, where the no-slip boundary condition at the wall is typically replaced by Neumann and no-transpiration conditions for the wall-parallel and wall-normal velocities, respectively. However, the turbulence intensity peaks are sensitive to the grid resolution and the prediction may degrade when the grid is refined. In the present study, a physical explanation of this phenomena is offered in terms of the behavior of the near-wall streaks. We also show that further improvements are achieved by introducing a Robin (slip) boundary condition with transpiration instead of the Neumann condition. By using a slip condition, the inner energy production peak is damped, and the blocking effect of the wall is relaxed such that the splatting of eddies at the wall is mitigated. As a consequence, the slip boundary condition provides an accurate and consistent prediction of the turbulence intensities regardless of the near-wall resolution.

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  • Received 24 July 2017

DOI:https://doi.org/10.1103/PhysRevFluids.3.014610

©2018 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

H. J. Bae1,2,*, A. Lozano-Durán1, S. T. Bose2,3, and P. Moin1

  • 1Center for Turbulence Research, Stanford University, Stanford, California 94305, USA
  • 2Institute for Computation and Mathematical Engineering, Stanford University, Stanford, California 94305, USA
  • 3Cascade Technologies, Inc., Palo Alto, California 94303, USA

  • *hjbae@stanford.edu

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Vol. 3, Iss. 1 — January 2018

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