2013/09/12 by Samuel Raben, Samuel G. Raben, Shane D. Ross +4
Engineering · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Control and Dynamics of Mobile Robots #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Spacecraft Dynamics and Control #physics.flu-dyn
paper · pdf · doi:10.48550/arxiv.1309.3180
openalex publication_date 2013/09/12 · arxiv created 2013/10/04 · arxiv updated 2013/10/07 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
This work provides an experimental method for simultaneously measuring finite time Lyapunov exponent fields for multiple particle groups, including non-flow tracers, in three-dimensional multiphase flows. From sequences of particle images, e.g., from experimental fluid imaging techniques, we can directly compute the flow map and coherent structures, with out performing the computationally costly numerical integration. This is particularly useful to find three-dimensional Lagrangian coherent structures for inertial particles, that do not follow the bulk fluid velocity, as we demonstrate for a grid turbulence experiment. The technique described may provide a new means for exploring the physics of experimental multi-phase flows.