标题： 拉格朗日统计在充分发展湍流中 显示英文标题

标题： Lagrangian statistics in fully developed turbulence

摘要： 流体粒子在充分发展湍流中的统计特性通过高分辨率直接数值模拟进行研究。 单个轨迹统计在超过三个数量级的时间范围内进行，从小于十分之一的科莫戈罗夫时间尺度到一个大涡旋翻转时间。 加速度和速度统计与最近的实验结果有明确的定量一致。 涡旋丝中的捕获效应导致拉格朗日可观测量的小尺度间歇性增强。 显示英文摘要

摘要： The statistical properties of fluid particles transported by a fully developed turbulent flow are investigated by means of high resolution direct numerical simulations. Single trajectory statistics is investigated in a time range spanning more than three decades, from less than a tenth of the Kolmogorov timescale up to one large-eddy turnover time. Acceleration and velocity statistics show a neat quantitative agreement with recent experimental results. Trapping effects in vortex filaments give rise to enhanced small-scale intermittency on Lagrangian observables.