A new low-Reynolds-number two-equation turbulence model with hybrid time-scales of mean flow and turbulence for complex wall flows

被引：0

作者：

Nagano, Yasutaka ^{[1
]}

Hattori, Hirofumi ^{[1
]}

Miyazawa, Jun ^{[1
]}

Inagaki, Ken-Ichiro ^{[1
]}

机构：

[1] Department of Mechanical Engineering, Nagoya Institute of Technology, Showa-ku, Nagoya, 466-8555, Gokiso-cho

来源：

Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | 2004年 / 70卷 / 696期

关键词：

Boundary Layer; Numerical Analysis; Separation; Shear Flow; Turbulent Flow;

D O I：

10.1299/kikaib.70.1911

中图分类号：

学科分类号：

摘要：

It is well known that the turbulence energy is overpredicted by the k-ε model at the stagnation point. This problem causes inadequate predictions of flow field. In particular, since the wind-power energy is proportional to wind velocity cubed, it is crucial to predict a correct profile of wind in selecting the best site for a wind power plant. The effects of the ground are often neglected owing to the very large length scale of the real environment. However, the complex terrain affects a profile of wind near the ground. Therefore, we have to consider the ground effects to obtain an exact profile of wind near the ground. In this study, to evaluate the performance of a low-Reynolds-number type turbulence model for flows on a complex terrain, we carried out a simulation of a flow around various complex terrain. From evaluation, we have improved the model introducing the time scale based on the velocity gradient parameter. The proposed model is evaluated in four complex turbulent flows, i.e., forward-facing step, two-dimensional block, two-dimensional hill and three-dimensional block flows. The proposed model indicates good agreement with the experimental data.

引用

页码：1911 / 1918

页数：7

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