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Direct numerical simulation of turbulent heat transfer in a wall-normal rotating channel flow

ISSN号：1001-6058
期刊名称：Journal of Hydrodynamics
时间：0
页码：26-31
语言：英文
分类：TV131[水利工程—水力学及河流动力学]
作者机构：[1]Department of Mechanics and Mechanical Engineering, University of Science and Technology of China,Hefei 230026, China
相关基金：Project supported by the National Natural Science Foundation of China （Grant Nos： 90405007, 10302028, 10125210）, Specialized Research Fund for the Doctoral Program of Higher Rducation （Grant No： 20020358013）, the China NKBRSF Pro jcct Grant No： 2001CB409600）, and the Hundred-Talent Program of the Chinese Academy of Sciences.
相关项目：绕飞行器可压缩湍流的大涡模拟及其与湍流模式的混合算法

作者： Liu, Nan-Sheng|Lu, Xi-Yun|Li, Bu-Yang|

关键词：直接数字模拟, 热转移, 热量统计学, DNS, 旋转水道流, Direct Numerical Simulation （DNS）, wallnormal rotating channel flow, turbulent heat transfer, thermal statistics

中文摘要：

在 wall-normalrotating 隧道流动的狂暴的热转移的直接 Nmerical 模拟(DNS ) 从 0 ～ 0.1 为旋转数字 N_ τ被执行了， Reynoldsnumber 194 基于非旋转的大小写的磨擦速度和隧道，和 Prandtl 的一半高度第一号。这研究的目的是在狂暴的流动和热转移的特征上揭示旋转的效果。基于现在的计算结果，二典型旋转政体被识别。什么时候 0 【 N_ τ 【 0.06，骚乱和热统计与跨度相关自从明智的吝啬的流动由 Coriolis 力量增加导致了的跨度的 shear 率，明智的速度变化被提高；然而，另外的统计被压制。当因为 Coriolis 力量效果在旋转流动作为一个统治角色玩， N_ τ 】0.06，骚乱和热统计显著地被压制时。ofnear 墙条纹基于速度和温度变化组织的方向的显著变化被识别。

英文摘要：

Direct Nmerical Simulation （DNS） of turbulent heat transfer in a wall-normal rotating channel flow has been carried out for the rotation number Nr from 0 to 0.1, the Reynolds number 194 based on the friction velocity of non ro taring case and the half-height of the channel, and the Prandtl number 1. The objective of this study is to reveal the effects of rotation on the characteristics of turbulent flow and heat transfer. Based on the present calculated results, two typical rotation regimes are identified. When 0 〈 Nr 〈 0.06, turbu lence and thermal statistics correlated with the spanwise veloc ity fluctuation are enhanced since the shear rate of spanwise mean flow induced by Coriolis force increases; however, the other statistics are suppressed. When Nr 〉 0.06, turbulence and thermal statistics are suppressed significantly because the Coriolis force effect plays as a dominated role in the rotating flow. Remarkable change of the direction of near wall streak structures based on the velocity and temperature fluctuations is identified.

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