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Lagrangian statistics of pressure fluctuation events in homogeneous isotropic turbulence

机译：拉格朗日统计均匀各向同性湍流压力波动事件

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摘要

Homogeneous and isotropic turbulent fields obtained from two direct numerical simulation databases (with Re-lambda equal to 150 and 418) were seeded with point particles that moved with the local fluid velocity to obtain Lagrangian pressure histories. Motivated by cavitation inception modeling, the statistics of events in which such particles undergo low-pressure fluctuations were computed, parameterized by the amplitude of the fluctuations and by their duration. The main results are the average frequencies of these events and the probabilistic distribution of their duration, which are of predictive value. A connection is also established between these average frequencies and the pressure probability density function, thus justifying experimental methods proposed in the literature. Further analyses of the data show that the occurrence of very-low-pressure events is highly intermittent and is associated with wormlike vortical structures of length comparable to the integral scale of the flow. Published under license by AIP Publishing.
机译：从两个直接数值模拟数据库获得的均匀和各向同性湍流场（具有等于150和418的重新λ），用点粒子与局部流体速度移动以获得拉格朗日压力历史。通过空化初始化建模的激励，这些事件的统计数据计算了这种颗粒经历低压波动的幅度，由波动的幅度和它们的持续时间进行参数化。主要结果是这些事件的平均频率和它们持续时间的概率分布，其具有预测值。在这些平均频率和压力概率密度函数之间也建立了一种连接，从而在文献中提出的实验方法。数据的进一步分析表明，非常低压事件的发生是高度间歇性的，并且与与流量的整体比较相当的长度的蠕虫涡流结构相关联。通过AIP发布在许可证下发布。

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