Visualizing Transport and Mixing in Particle-based Fluid Flows

Rapp, Tobias; Dachsbacher, Carsten

Visualizing Transport and Mixing in Particle-based Fluid Flows

Files

161-169.pdf (20.58 MB)

Date

2019

Authors

Rapp, Tobias
Dachsbacher, Carsten

Publisher

The Eurographics Association

Abstract

To gain insight into large, time-dependent particle-based fluid flows, we visually analyze Lagrangian coherent structures (LCS), a robust skeleton of the underlying particle dynamics. To identify these coherent structures, we build on recent work that efficiently computes the finite-time Lyapunov exponent (FTLE) directly on particle data. We formulate the LCS definitions for particles based on robust approximations for higher-order derivatives of the FTLE. Based on these formulations, we derive a per-particle distance to the closest coherent structure. This allows us to visually analyze and explore the Lagrangian transport behavior directly on the particle data. We show that this is especially beneficial to detect and visualize flow features on different time scales. Lastly, we apply our approach to study mixing in multiphase flows by visualizing the different types of fluids and their relation to the coherent structures.

        @inproceedings{10.2312:vmv.20191330
,
booktitle = {Vision, Modeling and Visualization
},
editor = {Schulz, Hans-Jörg and Teschner, Matthias and Wimmer, Michael
},
title = {{Visualizing Transport and Mixing in Particle-based Fluid Flows
}},
author = {Rapp, Tobias and 
Dachsbacher, Carsten
},
year = {2019
},
publisher = {The Eurographics Association
},
ISBN = {978-3-03868-098-7
},
DOI = {10.2312/vmv.20191330
}
}