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A novel buoyancy-modified subgrid-scale model for large-eddy simulation of turbulent convection

Ilyas Yilmaz (Department of Mechanical Engineering, Faculty of Engineering and Natural Sciences, Istanbul Bilgi University, Istanbul, Turkey)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 5 July 2021

Issue publication date: 10 August 2021

125

Abstract

Purpose

The purpose of this paper is to develop a subgrid-scale (SGS) model for large eddy simulation (LES) of buoyancy- and thermally driven transitional and turbulent flows and further examine its performance.

Design/methodology/approach

Favre-filtered, non-dimensional LES equations are solved using non-dissipative, fully implicit, kinetic energy conserving, finite-volume algorithm which uses an iterative predictor-corrector approach based on pressure correction. Also, to develop a new SGS model which accounts for buoyancy, turbulent generation term in SGS viscosity is properly modified and enhanced by buoyancy production.

Findings

The proposed model has been successfully applied to turbulent Rayleigh–Bénard convection. The results show that the model is able to reproduce the complex physics of turbulent thermal convection. In comparison with the original wall-adapting local eddy-viscosity (WALE) and buoyancy-modified (BM) Smagorinsky models, turbulent diagnostics predicted by the new model are in better agreement with direct numerical simulation.

Originality/value

A BM variant of the WALE SGS model is newly developed and analyzed.

Keywords

Acknowledgements

The numerical calculations reported in this study were fully performed at TUBITAK ULAKBIM, High Performance and Grid Computing Center (TRUBA resources).

Citation

Yilmaz, I. (2021), "A novel buoyancy-modified subgrid-scale model for large-eddy simulation of turbulent convection", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 31 No. 8, pp. 2509-2533. https://doi.org/10.1108/HFF-11-2020-0754

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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