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Vortex-identification methods from a different perspective
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SYSNO ASEP 0496425 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV O - Ostatní Název Vortex-identification methods from a different perspective Tvůrce(i) Kolář, Václav (UH-J) SAI, ORCID, RID
Šístek, Jakub (MU-W) RID, ORCID, SAIZdroj.dok. The 29th International Symposium on Transport Phenomena (ISTP29). - Honolulu : PCTFE, 2018 - ISBN N Poč.str. 6 s. Forma vydání Nosič - C Akce International Symposium on Transport Phenomena (ISTP29) /29./ Datum konání 30.10.2018 - 02.11.2018 Místo konání Honolulu Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova vortex ; vortex identification ; vortex-identification methods ; vortical flow ; vortical structures Vědní obor RIV BK - Mechanika tekutin Obor OECD Fluids and plasma physics (including surface physics) Vědní obor RIV – spolupráce Matematický ústav - Obecná matematika CEP GA18-09628S GA ČR - Grantová agentura ČR Institucionální podpora UH-J - RVO:67985874 ; MU-W - RVO:67985840 Anotace 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. Pracoviště Ústav pro hydrodynamiku Kontakt Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Rok sběru 2019
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