Počet záznamů: 1
Average corotation of line segments near a point and vortex identification
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SYSNO ASEP 0398283 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Average corotation of line segments near a point and vortex identification Tvůrce(i) Kolář, Václav (UH-J) SAI, ORCID, RID
Šístek, Jakub (MU-W) RID, ORCID, SAI
Cirak, F. (GB)
Moses, P. (CZ)Zdroj.dok. AIAA Journal - ISSN 0001-1452
Roč. 51, č. 11 (2013), s. 2678-2694Poč.str. 17 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova vortices ; vortex identification ; vortical structures Vědní obor RIV BK - Mechanika tekutin Vědní obor RIV – spolupráce Matematický ústav - Obecná matematika CEP IAA200600801 GA AV ČR - Akademie věd Institucionální podpora UH-J - RVO:67985874 ; MU-W - RVO:67985840 UT WOS 000338695600012 EID SCOPUS 84886700234 DOI 10.2514/1.J052330 Anotace An easy-to-interpret kinematic quantity measuring the average corotation of material line segments near a point is introduced and applied to vortex identification. At a given point, the vector of average corotation of line segments is defined as the average of the instantaneous local rigid-body rotation over “all planar cross sections” passing through the examined point. The vortex-identification method based on average corotation is a one-parameter, region-type local method sensitive to the axial stretching rate as well as to the inner configuration of the velocity gradient tensor. The method is derived from a well-defined interpretation of the local flow kinematics to determine the “plane of swirling” and is also applicable to compressible and variable-density flows. Practical application to direct numerical simulation datasets includes a hairpin vortex of boundary-layer transition, the reconnection process of two Burgers vortices, a flow around an inclined flat plate, and a flow around a revolving insect wing. The results agree well with some popular local methods and perform better in regions of strong shearing. Pracoviště Ústav pro hydrodynamiku Kontakt Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Rok sběru 2014
Počet záznamů: 1