粗粒应变动力学和前后色散
Coarse-grained strain dynamics and backwards/forwards dispersion
摘要：
在中等雷诺数的湍流中进行了粒子跟踪测速实验。我们目前实验获得的拉伸率的粒子对在惯性范围内。当补偿的特征时间尺度为粗粒度的应变，我们观察到不断的拉伸。这表明，在粘性子区中发生的材料线拉伸过程在惯性子区中具有对应的过程。我们调查向前和向后分散。我们发现了一个更快的向后拉伸，并将其与相对色散及其时间不对称性的问题。
英文摘要：
A Particle Tracking Velocimetry experiment has been performed in a turbulent flow at intermediate Reynolds number. We present experimentally obtained stretching rates for particle pairs in the inertial range. When compensated by a characteristic time scale for coarse-grained strain we observe constant stretching. This indicates that the process of material line stretching taking place in the viscous subrange has its counterpart in the inertial subrange. We investigate both forwards and backwards dispersion. We find a faster backwards stretching and relate it to the problem of relative dispersion and its time asymmetry.
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