Characterizing flows with an instrumented particle measuring Lagrangian accelerations
Characterizing flows with an instrumented particle measuring Lagrangian accelerations
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使用测量拉格朗日加速度的仪器化粒子表征流动
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
J. Pinton
中科院分区：
文献类型：
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作者：
R. Zimmermann;L. Fiabane;Y. Gasteuil;R. Volk;J. Pinton
在本文中，我们提出了一种新的拉格朗日测量技术：一种仪器粒子，当它在流动中平流时，它连续传递作用在它上面的力/加速度。我们开发了信号处理方法，从粒子传输的加速度信号中提取有关流动的信息。值得注意的是，我们能够表征作用在粒子上的力，并识别出永久大尺度涡旋结构的存在。我们的技术提供了一种快速、稳健和有效的工具来表征流动，特别适合于获得沿长轨迹的拉格朗日统计数据，或者在光学测量技术不适用或几乎不适用的情况下。
In this paper we present a novel Lagrangian measurement technique: an instrumented particle which continuously transmits the force/acceleration acting on it as it is advected in a flow. We have developed signal processing methods to extract information on the flow from the acceleration signal transmitted by the particle. Notably, we are able to characterize the force acting on the particle and identify the presence of a permanent large-scale vortex structure. Our technique provides a fast, robust and efficient tool to characterize flows and is particularly suited to obtain Lagrangian statistics along long trajectories or in cases where optical measurement techniques are not or hardly applicable.