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Vortex-identification methods from a different perspective
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SYSNO ASEP 0496425 Document Type C - Proceedings Paper (int. conf.) R&D Document Type O - Ostatní Title Vortex-identification methods from a different perspective Author(s) Kolář, Václav (UH-J) SAI, ORCID, RID
Šístek, Jakub (MU-W) RID, ORCID, SAISource Title The 29th International Symposium on Transport Phenomena (ISTP29). - Honolulu : PCTFE, 2018 - ISBN N Number of pages 6 s. Publication form Medium - C Action International Symposium on Transport Phenomena (ISTP29) /29./ Event date 30.10.2018 - 02.11.2018 VEvent location Honolulu Country US - United States Event type WRD Language eng - English Country US - United States Keywords vortex ; vortex identification ; vortex-identification methods ; vortical flow ; vortical structures Subject RIV BK - Fluid Dynamics OECD category Fluids and plasma physics (including surface physics) Subject RIV - cooperation Mathematical Institute - General Mathematics R&D Projects GA18-09628S GA ČR - Czech Science Foundation (CSF) Institutional support UH-J - RVO:67985874 ; MU-W - RVO:67985840 Annotation A more universal classification of vortex-identification methods starts with the basic fluid-mechanical approach adopted: Lagrangian or Eulerian. Eulerian methods can be further sub-classified as local (pointwise) or non-local. The Eulerian local methods aim either at the vortex volumetric region (region-type schemes) or at the vortexcore skeleton (line-type schemes). Most of the Eulerian region-type methods (including some Lagrangian) are based on one vortex feature to derive a yes/no criterion which may provide the intensity measure of local vortex motion inside the vortex region, however, no applicable quantitative information outside the vortex region. The present paper aims to distinguish and emphasize those vortex-identification tools which are simultaneously and adequately informative outside the vortex regions, that is, basically covering the whole flow domain and especially indicating regions of strong strain-rate or shearing. This is due to a certain duality property of criterial measures applied (Q-criterion, MZ-criterion) or due to a rational velocity-gradient analysis of a wider applicability (triple decomposition method, corotation/contrarotation scheme). The latter provide complex information at each point of the flow field while the former distinguish two or more qualitatively different non-overlapping flow regions. Some illustrative vortical-flow examples are included. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2019
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