Consequences of the close relation between Rortex and swirling strength

0532125 - ÚH 2021 RIV US eng J - Journal Article
Kolář, Václav - Šístek, Jakub
Consequences of the close relation between Rortex and swirling strength.
Physics of Fluids. Roč. 32, č. 9 (2020), č. článku 91702. ISSN 1070-6631. E-ISSN 1089-7666
R&D Projects: GA ČR(CZ) GA18-09628S
Institutional support: RVO:67985874 ; RVO:67985840
Keywords : vortex * vortex identification * vortex-identification methods * Rortex * swirling strength
OECD category: Fluids and plasma physics (including surface physics); Applied mathematics (MU-W)
Impact factor: 3.521, year: 2020
Method of publishing: Open access with time embargo
https://aip.scitation.org/doi/pdf/10.1063/5.0023732

Direct consequences stem from the close relation between the recently proposed vortex vector (Rortex) and the swirling strength. It is shownthat these vortex-identification methods share some relevant properties: (i) both provide the same and, practically, the largest vortex region,(ii) both allow an unlimited uniaxial stretching described by an axisymmetric strain rate, so the strain-rate magnitude inside a vortex maybecome much larger (without any limitation) than the vorticity magnitude, and (iii) both exhibit a discontinuous outcome, known as theso-called disappearing vortex problem.
Permanent Link: http://hdl.handle.net/11104/0310727