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A numerical investigation of turbulent flows in a spanwise rotating channel

机译：翼展方向旋转通道内湍流的数值研究

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摘要

A numerical investigation of fully developed turbulent flow in a spanwise rotating channel is performed to study turbulence characteristics subject to system rotation. The work provides insight into several salient features of the spanwise rotating turbulent channel flows, including the near-wall vortical structures, turbulence energy cascade and redistribution, and vortex stretching. The influence of system rotation on the near-wall vortical structures is investigated based on the vorticity fluctuations and their probability density functions (PDF). The properties of the Lamb vector fluctuation and the corresponding PDF are examined to reveal the effect of rotation on the turbulence energy cascade and production in the rotating channel. The budgets of Reynolds stresses and fluctuating enstrophy are analyzed to elucidate the role of the Coriolis force on turbulence energy redistribution between the streamwise and wall-normal directions and the mechanisms of vortex stretching for the generation of the vorticity fluctuations near the pressure and suction walls.
机译：对翼展方向旋转通道中充分发展的湍流进行了数值研究，以研究受系统旋转影响的湍流特性。这项工作深入了解了展向旋转湍流通道流动的几个显着特征，包括近壁涡旋结构，湍流能量级联和重新分布以及涡旋拉伸。基于旋涡起伏及其概率密度函数（PDF），研究了系统旋转对近壁旋涡结构的影响。检查了兰姆向量波动的性质和相应的PDF，以揭示旋转对湍流能量级联和旋转通道中产生的影响。分析了雷诺应力和波动的涡旋的预算，以阐明科里奥利力在流向和壁法向之间的湍流能量重新分布中的作用，以及涡旋拉伸的机制，从而在压力壁和吸壁附近产生了涡度涨落。

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