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首页> 外文会议>International Symposium on Fluid Machinery and Fluid Engineering(ISFMFE); 20041201-03; Beijing(CN) >LARGE EDDY SIMULATION OF DUCT FLOW
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LARGE EDDY SIMULATION OF DUCT FLOW

机译：管道流动的大涡模拟

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摘要

Thanks to great progress in computer technology, large eddy simulation (LES) is becoming feasible for engineering applications. However, there are different views as to the modelling practice that should be employed, and work to clarify this is needed. This paper presents the LES investigation of a fully turbulent flow through a straight duct with square cross section at a relatively high Reynolds number Re=83,000 using a commercial CFD code. Two simpler subgrid scale (SGS) models, the Smagorinsky-Lilly and the Renormalization group (RNG) based SGS models were employed with a mesh size of 1.92 M cells in the calculations. The LES calculations successfully reproduced the turbulence and the weak turbulence-driven secondary flow in the duct. The obtained mean streamwise velocity is in good agreement with experiment. The resolved Reynolds stresses and the mean secondary flow are comparable to experiment. The turbulence energy spectrum is shown to be comparable to the -5/3 slope as well. Considering the relatively high Reynolds number and the simple SGS models employed in the present duct LES investigation, the achieved result is encouraging.
机译：由于计算机技术的巨大进步，大型涡流仿真（LES）在工程应用中变得可行。但是，对于应采用的建模实践存在不同的观点，需要进行工作来阐明这一点。本文介绍了使用商业CFD代码对具有较高雷诺数Re = 83,000的具有直角截面直管的全湍流进行的LES研究。计算中使用了两个更简单的亚网格规模（SGS）模型，即Smagorinsky-Lilly模型和基于重归化组（RNG）的SGS模型，其网格大小为1.92 M单元。 LES计算成功地再现了管道中的湍流和弱湍流驱动的二次流。所得平均水流速度与实验吻合良好。解析的雷诺应力和平均二次流与实验相当。湍流能谱也显示出与-5/3斜率相当。考虑到目前的导管LES研究采用相对较高的雷诺数和简单的SGS模型，取得的结果令人鼓舞。

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