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Experiments in Fluids

Erschienen in:

01.10.2014 | Letter

Experimental determination of three-dimensional finite-time Lyapunov exponents in multi-component flows

verfasst von: Samuel G. Raben, Shane D. Ross, Pavlos P. Vlachos

Erschienen in: Experiments in Fluids | Ausgabe 10/2014

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Abstract

We present an experimental approach for estimating finite-time Lyapunov exponent fields (FTLEs) in three-dimensional multi-component or multi-phase flows. From time-resolved sequences of particle images, we directly compute the flow map and coherent structures, while avoiding and outperforming the computationally costly numerical integration. Performing this operation independently on each flow component enables the determination of three-dimensional Lagrangian coherent structures (LCSs) without any bias from the other components. The locations of concurrent LCSs for different flow elements (e.g., passive tracers, inertial particles, bubbles, or active particles) can provide new insight into the interpenetrating FTLE structure in complex flows.

Vorheriger Artikel Simultaneous concentration and velocity field measurements in a shock-accelerated mixing layer

Nächster Artikel Effect of linear image processing on the depth of correlation in micro PIV

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Titel: Experimental determination of three-dimensional finite-time Lyapunov exponents in multi-component flows
verfasst von: Samuel G. Raben
Shane D. Ross
Pavlos P. Vlachos
Publikationsdatum: 01.10.2014
Verlag: Springer Berlin Heidelberg
Erschienen in: Experiments in Fluids / Ausgabe 10/2014
Print ISSN: 0723-4864
Elektronische ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-014-1824-3

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