Stretching response of Rortex and other vortex-identification schemes

Stretching response of Rortex and other vortex-identification schemes

By considering a uniaxial stretching coupled with an inevitable uniform radial contraction for incompressible flow, a straightforward comparison of the stretching response for several popular vortex-identification criteria and the recently proposed vortex vector (Rortex) is presented. In addition, t...

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Main Authors: V. Kolář, J. Šístek
Format: Article
Language:English
Published: AIP Publishing LLC 2019-10-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/1.5127178
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spelling doaj-12be7571705a4590b50a52fe5f0e86732020-11-24T21:42:06ZengAIP Publishing LLCAIP Advances2158-32262019-10-01910105025105025-310.1063/1.5127178076910ADVStretching response of Rortex and other vortex-identification schemesV. Kolář0J. Šístek1Institute of Hydrodynamics of the Czech Academy of Sciences, 166 12 Prague, Czech RepublicInstitute of Mathematics of the Czech Academy of Sciences, 115 67 Prague, Czech RepublicBy considering a uniaxial stretching coupled with an inevitable uniform radial contraction for incompressible flow, a straightforward comparison of the stretching response for several popular vortex-identification criteria and the recently proposed vortex vector (Rortex) is presented. In addition, the outcome of the triple-decomposition method in terms of the residual vorticity tensor is employed due to its planar coincidence with Rortex. The stretching sensitivity of the examined schemes significantly differs and, consequently, reopens the persisting vortex-identification problem that the requirement of orbital compactness of the motion inside a vortex contradicts with the allowance for an arbitrary axial strain.http://dx.doi.org/10.1063/1.5127178
collection DOAJ
language English
format Article
sources DOAJ
author V. Kolář
J. Šístek
spellingShingle V. Kolář
J. Šístek
Stretching response of Rortex and other vortex-identification schemes
AIP Advances
author_facet V. Kolář
J. Šístek
author_sort V. Kolář
title Stretching response of Rortex and other vortex-identification schemes
title_short Stretching response of Rortex and other vortex-identification schemes
title_full Stretching response of Rortex and other vortex-identification schemes
title_fullStr Stretching response of Rortex and other vortex-identification schemes
title_full_unstemmed Stretching response of Rortex and other vortex-identification schemes
title_sort stretching response of rortex and other vortex-identification schemes
publisher AIP Publishing LLC
series AIP Advances
issn 2158-3226
publishDate 2019-10-01
description By considering a uniaxial stretching coupled with an inevitable uniform radial contraction for incompressible flow, a straightforward comparison of the stretching response for several popular vortex-identification criteria and the recently proposed vortex vector (Rortex) is presented. In addition, the outcome of the triple-decomposition method in terms of the residual vorticity tensor is employed due to its planar coincidence with Rortex. The stretching sensitivity of the examined schemes significantly differs and, consequently, reopens the persisting vortex-identification problem that the requirement of orbital compactness of the motion inside a vortex contradicts with the allowance for an arbitrary axial strain.
url http://dx.doi.org/10.1063/1.5127178
work_keys_str_mv AT vkolar stretchingresponseofrortexandothervortexidentificationschemes
AT jsistek stretchingresponseofrortexandothervortexidentificationschemes
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