What is it about?

Advances in three-dimensional Particle Tracking Velocimetry (4D-PTV) techniques have consistently revealed more accurate information in turbulent. We proposed that particles are not alone in the flow field. They act in coherent with their neighbors. Lagrangian Coherent Track Initialization (LCTI) applies physics-based Finite Time Lyapunov Exponent (FTLE) to build coherent trajectories.

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Why is it important?

Our findings show that adding physics-based information of coherent motions can increase accuracy and robustness of flows with high particle concentration, large temporal scale, and noisy reconstruction featured by complex motions, such as high velocity and acceleration gradients.


The proposed technique can be used either as an embedded module for the 4D-PTV process or as a standalone four-frame-based tracker. More research is needed to understand and track clusters of coherent particles in real experiments.

Ali Rahimi Khojasteh
Institut National de la Recherche Agronomique

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This page is a summary of: Lagrangian coherent track initialization, Physics of Fluids, September 2021, American Institute of Physics, DOI: 10.1063/5.0060644.
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