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.

中文翻译：

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一种用于湍流对流大涡模拟的新型浮力修正亚网格模型

目的

本文的目的是开发用于浮力和热驱动的过渡流和湍流的大涡模拟 (LES) 的亚网格尺度 (SGS) 模型，并进一步检查其性能。

设计/方法/方法

Favre 过滤的无量纲 LES 方程使用非耗散、完全隐式、动能守恒、有限体积算法求解，该算法使用基于压力校正的迭代预测器-校正器方法。此外，为了开发一个新的 SGS 模型，该模型考虑了浮力，SGS 粘度中的湍流生成项通过浮力产生进行了适当的修改和增强。

发现

所提出的模型已成功应用于湍流瑞利-贝纳德对流。结果表明，该模型能够重现湍流热对流的复杂物理过程。与原始的壁面适应局部涡粘性 (WALE) 和浮力修正 (BM) Smagorinsky 模型相比，新模型预测的湍流诊断与直接数值模拟更加吻合。

原创性/价值

新开发和分析了 WALE SGS 模型的 BM 变体。