表征流体流动混合的新拉格朗日诊断法
New Lagrangian diagnostics for characterizing fluid flow mixing
摘要：
提出了一种新的拉格朗日诊断族，并提出了一种描述混合的特殊形式：轨迹的最大范围（MET）。它使相干结构和它们的动态检测在二维（和潜在的三维）非定常流在有界和开放域。它的计算比我们已知的所有其他拉格朗日诊断容易得多，并提供了新的见解关于混合性质的短期和长期的时间尺度和空间图和分布图。我们证明了它的适用性，二维流动使用两个玩具模型和一组数据的表面电流从地中海。
英文摘要：
A new kind of Lagrangian diagnostic family is proposed and a specific form of it is suggested for characterizing mixing: the maximal extent of a trajectory (MET). It enables the detection of coherent structures and their dynamics in two- (and potentially three-) dimensional unsteady flows in both bounded and open domains. Its computation is much easier than all other Lagrangian diagnostics known to us and provides new insights regarding the mixing properties on both short and long time scales and on both spatial plots and distribution diagrams. We demonstrate its applicability to two dimensional flows using two toy models and a data set of surface currents from the Mediterranean Sea.
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