文章基本信息

标题：Experimental Observations of Lagrangian Coherent Structures and Fluid Transports in Perturbed Rayleigh-Bénard Convection
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作者：Masahito Watanabe ; Hiroaki Yoshimura
期刊名称：IFAC PapersOnLine
印刷版ISSN：2405-8963
出版年度：2021
卷号：54
期号：14
页码：448-453
DOI：10.1016/j.ifacol.2021.10.395
语种：English
出版社：Elsevier
摘要：AbstractIn this paper, we make experimental observations of the perturbed Rayleigh-Bénard convection to detect the Lagrangian coherent structures (LCSs), which correspond to the invariant manifolds of time-dependent systems and also to investigate the associated fluid transports by numerically integrating the two-dimensional velocity field obtained by Particle Image Velocimetry (PIV). We show the chaotic fluid transports that appear in the system, though some particles are transported almost periodically with time period T or 3T, where T = 17.3 s is the period of the perturbation. We finally propose a novel perturbed Hamiltonian system that enables to recover qualitatively global behaviors observed in experimental results and we also explore the periodic fluid transport that appear in the system.
关键词：KeywordsRayleigh-Bénard convectionLagrangian coherent structurechaotic mixingperiodic transportperturbed Hamiltonian systemexperimentParticle Image Velocimetry