caa a22 4500 606198067 CHVBK 20210128100932.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00348-015-2061-0 doi (NATIONALLICENCE)springer-10.1007/s00348-015-2061-0 Lagrangian coherent structure identification using a Voronoi tessellation-based networking algorithm [Elektronische Daten] [Giuseppe Rosi, Andrew Walker, David Rival] The quantification of Lagrangian coherent structures (LCS) has been investigated using an algorithm based on the tesselation of unstructured data points. The applicability of the algorithm in resolving an LCS was tested using a synthetically generated unsteady double-gyre flow and experimentally in a nominally two-dimensional free shear flow. The effects of two parameters on LCS identification were studied: the threshold track length used to quantify the LCS and resulting effective seeding density upon applying the threshold. At lower threshold track lengths, increases in the threshold track length resulted in finite-time Lyapunov exponent (FTLE) field convergence towards the expected LCS ridge of the double-gyre flow field at several effective seeding densities. However, at higher track lengths, further increases to the threshold track length failed to improve convergence at low effective seeding densities. The FTLE of the experimental data set was well-resolved using moderate threshold track lengths that achieved field convergence but maintained a sufficiently high seeding density. In contrast, the use of lower or higher track lengths produced an FTLE field characterized by an incoherent LCS ridge. From the analytical and experimental results, recommendations are made for future experiments for identifying LCS directly from unstructured data. Springer-Verlag Berlin Heidelberg, 2015 Rosi Giuseppe Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, Canada aut Walker Andrew Department of Anesthesia, University of Calgary, Calgary, AB, Canada aut Rival David Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, Canada aut Experiments in Fluids Springer Berlin Heidelberg 56/10(2015-10-01), 1-14 0723-4864 56:10<1 2015 56 348 https://doi.org/10.1007/s00348-015-2061-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-2061-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rosi Giuseppe Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, Canada aut NATIONALLICENCE 700 1- Walker Andrew Department of Anesthesia, University of Calgary, Calgary, AB, Canada aut NATIONALLICENCE 700 1- Rival David Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, Canada aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/10(2015-10-01), 1-14 0723-4864 56:10<1 2015 56 348