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Minimum-dissipation scalar transport model for large-eddy simulation of turbulent flows

Mahdi Abkar*, Hyun J. Bae, and Parviz Moin

  • Center for Turbulence Research, Stanford University, Stanford, California 94305, USA

  • *abkar@stanford.edu
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Phys. Rev. Fluids 1, 041701(R) – Published 29 August, 2016

DOI: https://doi.org/10.1103/PhysRevFluids.1.041701

Abstract

Minimum-dissipation models are a simple alternative to the Smagorinsky-type approaches to parametrize the subfilter turbulent fluxes in large-eddy simulation. A recently derived model of this type for subfilter stress tensor is the anisotropic minimum-dissipation (AMD) model [Rozema et al., Phys. Fluids 27, 085107 (2015)], which has many desirable properties. It is more cost effective than the dynamic Smagorinsky model, it appropriately switches off in laminar and transitional flows, and it is consistent with the exact subfilter stress tensor on both isotropic and anisotropic grids. In this study, an extension of this approach to modeling the subfilter scalar flux is proposed. The performance of the AMD model is tested in the simulation of a high-Reynolds-number rough-wall boundary-layer flow with a constant and uniform surface scalar flux. The simulation results obtained from the AMD model show good agreement with well-established empirical correlations and theoretical predictions of the resolved flow statistics. In particular, the AMD model is capable of accurately predicting the expected surface-layer similarity profiles and power spectra for both velocity and scalar concentration.

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Phys. Rev. Fluids 1, 041701(R)– Published 29 August, 2016
  • Received 11 April 2016

©2016 American Physical Society

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