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首页> 外文期刊>Science in China. Series G, Physics & Astronomy >Rotation effect on near-wall turbulence statistics and flow structures
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Rotation effect on near-wall turbulence statistics and flow structures

机译：旋转对近壁湍流统计和流动结构的影响

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摘要

Large eddy simulation (LES) of turbulent flow through an axially rotating pipe, coupled with nonlinear dynamic subgrid-scale (SGS) model, is carried out to investigate rotation effect on the near-wall turbulence characteristics and flow structures. In the rotating turbulent pipe flow, it is found that the tendency towards a relaminarized flow appears and the axial velocity fluctuation is suppressed; however, the azimuthal fluctuation is enhanced due to the presence of the pipe wall rotation. The joint probability density function (joint PDF) of the velocity fluctuations and the probability density function (PDF) of the helicity fluctuation are analyzed in detail. It is revealed that the resolved Reynolds stress and helicity fluctuation in the wall region are closely related to the correlation between the velocity and vorticity fluctuations and affected significantly by the rotation-induced azimuthal mean flow. Further, the budgets of resolved Reynolds stresses indicate that the rotation effect is responsible for the more active turbulent energy redistribution and the production of the azimuthal turbulence fluctuation. The near-wall inclined streaky structures with respect to the axial direction are ascribed to the spiral motion of the fluid induced by the rotating pipe. The turbulence characteristics revealed in this study are of great help for the understanding of physical fundamentals in the rotating turbulent flows and for the development of reliable turbulence model.
机译：通过轴向旋转管道的湍流大涡模拟（LES），并结合非线性动态子网格比例（SGS）模型，研究了旋转对近壁湍流特性和流动结构的影响。发现在旋转的湍流管流中，出现了再分层流的趋势并且抑制了轴向速度波动。然而，由于管壁旋转的存在，方位角波动增加了。详细分析了速度波动的联合概率密度函数（联合PDF）和螺旋度波动的概率密度函数（PDF）。结果表明，壁面区域的解析雷诺应力和螺旋度波动与速度和旋涡波动之间的相关性密切相关，并且受到旋转引起的方位平均流量的显着影响。此外，已解决的雷诺应力的预算表明旋转效应是导致更活跃的湍流能量重新分布和方位湍流波动产生的原因。相对于轴向方向的近壁倾斜条纹结构归因于由旋转管引起的流体的螺旋运动。这项研究揭示的湍流特性对于理解旋转湍流中的物理基本原理和建立可靠的湍流模型都具有很大的帮助。

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