Assessment of Thermal Boundary Models for Large Eddy Simulations of Natural Convection

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2024-10-28 DOI:10.1007/s10494-024-00594-8

Lise Ceresiat, Miltiadis V. Papalexandris

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引用次数: 0

Abstract

In this paper, we report on the efficacy of four different thermal boundary models for Wall-Modelled Large Eddy Simulations (WMLES) of turbulent natural convection. Our test cases consist of Rayleigh-Bénard convection of liquid water at two Rayleigh numbers, \(Ra =1.35{\times }10^8\) and \(Ra =10^9\), respectively. Two configurations are examined, namely, convection in a box and in a cavity; the latter one involving a free-slip top boundary. For these test cases, the numerical results obtained via WMLES with the thermal boundary models are compared with those of Wall-Resolved Large-Eddy Simulations. According to our comparative studies, a particular version of the so-called Kays & Crawford model provides the most accurate predictions, at least for the test cases considered herein. Additionally, in this paper, we report on WMLES of turbulent convection at a higher Rayleigh number, \(Ra =5{\times }10^9\), with the aforementioned model. For this case, we analyse herein the flow structure and present results for first and second-order statistics of the flow.

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自然对流大涡模拟的热边界模式评估

在本文中，我们报告了四种不同的热边界模型对湍流自然对流的壁式大涡模拟（WMLES）的有效性。我们的测试用例包括两个瑞利数（分别为\(Ra =1.35{\times }10^8\)和\(Ra =10^9\)）下液态水的瑞利-巴姆纳德对流。研究了两种结构，即箱内对流和腔内对流；后者涉及自由滑移顶边界。针对这些试验用例，将基于热边界模型的WMLES数值模拟结果与壁面分辨大涡模拟结果进行了比较。根据我们的比较研究，一个特殊版本的所谓的凯斯和；Crawford模型提供了最准确的预测，至少对于这里考虑的测试用例来说是这样。此外，在本文中，我们用上述模型报道了更高瑞利数\(Ra =5{\times }10^9\)下湍流对流的WMLES。针对这种情况，本文分析了流动结构，并给出了流动的一阶和二阶统计量的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.