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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >A novel buoyancy-modified subgrid-scale model for large-eddy simulation of turbulent convection
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A novel buoyancy-modified subgrid-scale model for large-eddy simulation of turbulent convection

机译：一种新型浮力改进的湍流对流模拟型谱模型模型

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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-Benard convectioa 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.
机译：目的 - 本文的目的是为大型涡流仿真（LES）开发划分级（SGS）模型，浮动和热驱动的过渡和湍流流动，进一步检查其性能。设计/方法/方法 - 使用非耗散，完全隐含的动能节省，有限卷算法来解决设计/方法，无维度LES方程，其使用基于压力校正的迭代预测器校正器方法。此外，为了开发一个令人生意的SGS模型，SGS粘度下的湍流产生术语被浮力生产适当地修改和增强。调查结果 - 拟议的模型已成功应用于湍流瑞利 - 贝纳特对流，结果表明该模型能够再现湍流热对流的复杂物理学。与原始墙体适应局部涡流（WALE）和浮力改性（BM）SMAGORINSKY模型相比，新模型预测的湍流诊断与直接数值模拟更好。创意/值 - WALE SGS模型的BM变体是新开发和分析的。

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