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首页> 外文期刊>Journal of Hydrodynamics >DIRECT NUMERICAL SIMULATION OF TURBULENT HEAT TRANSFER IN A WALL-NORMAL ROTATING CHANNEL FLOW
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DIRECT NUMERICAL SIMULATION OF TURBULENT HEAT TRANSFER IN A WALL-NORMAL ROTATING CHANNEL FLOW

机译：壁面旋转通道内湍流传热的直接数值模拟

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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 N_τ from 0 to 0.1, the Reynolds number 194 based on the friction velocity of non-rotating 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 < N_τ < 0.06, turbulence and thermal statistics correlated with the spanwise velocity fluctuation are enhanced since the shear rate of spanwise mean flow induced by Coriolis force increases; however, the other statistics are suppressed. When N_τ > 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.
机译：对于旋转数N_τ从0到0.1，雷诺数194（基于非旋转壳体的摩擦速度和半旋转）的壁面法向旋转通道流中的湍流传热进行了直接数值模拟（DNS）。通道的高度和Prandtl数1。本研究的目的是揭示旋转对湍流和热传递特性的影响。基于当前的计算结果，确定了两种典型的旋转方式。当0 0.06时，湍流和热统计被显着抑制，因为科里奥利力效应在旋转流中起主导作用。基于速度和温度波动，确定了近壁条纹结构方向的显着变化。

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