Assessment of RANS, LES, and Hybrid RANS/LES Models for the Prediction of Low-Pr Turbulent Flows

Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fl Pub Date : 2018-07-15 DOI:10.1115/FEDSM2018-83307

S. Bhushan, O. Elfajri, W. Jock, D. K. Walters, J. Lai, Y. Hassan, R. Jackson, A. Obabko, E. Merzari

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引用次数: 2

Abstract

The predictive capability of RANS, hybrid RANS/LES and LES turbulence models for momentum and thermal energy transfer in wall bounded low-Pr turbulent flows is investigated. Plane channel flow simulations are performed for Reτ = 150 and 640 for Pr = 0.025 and 0.71 with and without buoyancy effects, including both forced and mixed force/natural convection conditions, using the open source spectral element flow solver Nek5000. The prediction of one-point velocity and temperature statistics from the simulations are compared against available DNS results. Results are analyzed to understand the effect of flow conditions on turbulent thermal transport, and assess the relative strengths and weaknesses of the different modeling methods.

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RANS、LES和混合RANS/LES模型对低pr湍流预测的评估

研究了RANS、混合RANS/LES和LES湍流模型对壁面有界低pr湍流动量和热能传递的预测能力。利用开源谱元流动求解器Nek5000，在Reτ = 150和640、Pr = 0.025和0.71条件下，进行了有浮力和无浮力影响的平面通道流动模拟，包括强制和混合力/自然对流条件。将模拟得到的单点速度和温度统计数据与现有DNS结果进行了比较。分析结果，了解流动条件对湍流热输运的影响，并评估不同建模方法的相对优缺点。

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Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fl

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