老龄化和过渡性流的记忆
Vasudevan Mukund1, Chaitanya S Paranjape1, Michael Philip Sitte1
1Institute of Science and Technology Austria (ISTA), Klosterneuburg, Austria.
Nature communications
|September 26, 2025
概括
流中流的发生并非无记忆,这挑战了定向透模型. 局部动荡条纹表现出老化,与管道和Couette流的理论预测有所不同.
科学领域:
- 流体动力学 流体动力学
- 非线性动力学是一种非线性动力学.
- 统计力学 统计力学
背景情况:
- 剪切流中的流过渡往往被建模为定向透 (DP) 阶段过渡.
- 对DP类比的一个关键假设是动荡站点的无记忆性.
研究的目的:
- 为了研究乱的条纹衰变和道流中的扩散的记忆特性.
- 评估定向透类比对通道流动流开始的有效性.
- 探索混沌解释对局部动荡条纹的适用性.
主要方法:
- 对道流中的孤立流条的生存曲线的分析.
- 将道流动力学与管道和Couette流动的既定模型进行比较.
主要成果:
- 流的条纹衰变和通道流中的扩散并不是没有记忆的.
- 孤立的通道条纹在临界点附近呈现老化.
- 在这个方案中,流条和DP站点之间的一对一映射没有实现.
- 混乱的解释不适用于个别的局部条纹.
结论:
- 基于无记忆站点的定向透类比,对于通道流动流的发生是不够的.
- 剪流的几何差异可以从根本上改变流过渡机制.
- 与理想化的DP模型相比,通道流中的局部流结构具有不同的动态.
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