About: Average corotation of line segments near a point and vortex identification

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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. 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. (en)
Title	Average corotation of line segments near a point and vortex identification Average corotation of line segments near a point and vortex identification (en)
skos:prefLabel	Average corotation of line segments near a point and vortex identification Average corotation of line segments near a point and vortex identification (en)
skos:notation	RIV/67985874:_____/13:00398283!RIV14-AV0-67985874
http://linked.open...avai/predkladatel	Ústav pro hydrodynamiku AV ČR, v. v. i.
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(IAA200600801)
http://linked.open...iv/cisloPeriodika	11
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Kolář, Václav
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav pro hydrodynamiku AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	62740
http://linked.open...ai/riv/idVysledku	RIV/67985874:_____/13:00398283
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	vortices; vortex identification; vortical structures (en)
http://linked.open.../riv/klicoveSlovo	vortices vortex identification vortical structures
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[63217CA8CC2C]
http://linked.open...i/riv/nazevZdroje	AIAA Journal
http://linked.open...in/vavai/riv/obor	BK
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Decomposition techniques for flow-field analysis
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	51
http://linked.open...iv/tvurceVysledku	Kolář, Václav Šístek, Jakub Cirak, F. Moses, P.
issn	0001-1452
number of pages	17 (xsd:int)
http://bibframe.org/vocab/doi	10.2514/1.J052330

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