Third generation of vortex identification methods: Omega and Liutex/Rortex based systems
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Hydrodynamics"
DOI: 10.1007/s42241-019-0022-4
Abstract: A vortex is intuitively recognized as the rotational/swirling motion of fluids, but a rigorous and universally-accepted definition is still not available. Vorticity tube/filament has been regarded equivalent to a vortex since Helmholtz proposed the concepts… read more here.
Keywords: generation vortex; identification methods; vortex identification; identification ... See more keywords
Galilean invariance of Omega vortex identification method
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DOI: 10.1007/s42241-019-0024-2
Abstract: In the new vortex identification method (Liu et al. 2016) to represent the rotation level and capture and visualize the vortices, proposed in our previous study, the independence of the reference frame and the Galilean… read more here.
Keywords: identification method; vortex identification; galilean invariance;
Comparisons and analyses of vortex identification between Omega method and Q criterion
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DOI: 10.1007/s42241-019-0025-1
Abstract: The present paper presents comparisons of the vortex identification between the omega method and the Q criterion based on the data of a classical flow. From the comparisons of the vortex structure together with the… read more here.
Keywords: method criterion; vortex identification; identification omega; omega method ... See more keywords
Objective Omega vortex identification method
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DOI: 10.1007/s42241-019-0028-y
Abstract: A new vortex identification method (Liu et al. 2016) was proposed to represent the rotation relative strength and capture and visualize the vortices in our previous study. The basic idea of the Ω method is… read more here.
Keywords: identification method; vortex identification; method; vortex ... See more keywords
Vortex identification methods in marine hydrodynamics
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Hydrodynamics"
DOI: 10.1007/s42241-020-0022-4
Abstract: In this paper, several commonly used vortex identification methods for marine hydrodynamics are revisited. In order to extract and analyse the vortical structures in marine hydrodynamics, the Q, λ 2 — criterion and modified normalized… read more here.
Keywords: identification methods; hydrodynamics; methods marine; vortex identification ... See more keywords
Anisotropic complex diffusion filtering for comparison of the vortex identification methods in homogeneous turbulence
Sign Up to like & getrecommendations! Published in 2017 at "International Journal of Mechanical Sciences"
DOI: 10.1016/j.ijmecsci.2017.10.023
Abstract: Abstract The vortex identification methods are mutually compared on the basis of extracting coherent vortices and isolating incoherent regions from a filtered turbulent velocity field. Those identification schemes are the high rotation Q − criterion,… read more here.
Keywords: identification methods; non filtered; jpdfs non; vortex identification ... See more keywords
An objective version of the Rortex vector for vortex identification
Sign Up to like & getrecommendations! Published in 2019 at "Physics of Fluids"
DOI: 10.1063/1.5095624
Abstract: Vortices are a ubiquitous natural phenomenon, and their structure, shape, and characteristics should be independent of the observer, which implies that the vortex identification method or vortex definition should maintain its objectivity. Currently, most of… read more here.
Keywords: velocity gradient; definition; vortex identification; gradient tensor ... See more keywords
Modified normalized Rortex/vortex identification method
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DOI: 10.1063/1.5109437
Abstract: In this paper, a modified normalized Rortex/vortex identification method named Omega_R is presented to improve the original Omega_R method and cure the bulging phenomenon on the iso-surfaces caused by the original Omega_R method. Detailed mathematical… read more here.
Keywords: rortex vortex; method; identification method; modified normalized ... See more keywords
Stretching response of Rortex and other vortex-identification schemes
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DOI: 10.1063/1.5127178
Abstract: 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… read more here.
Keywords: stretching response; vortex; rortex; vortex identification ... See more keywords
Numerical investigation of the cavitating flow structure with special emphasis on the vortex identification method
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DOI: 10.1142/s021798492050058x
Abstract: The three kinds of vortex identification methods, namely, ωz criterion, Q criterion and Ω method, are then employed to investigate the physical interactions between the cavitation and vortex dynami... read more here.
Keywords: cavitating flow; method; investigation cavitating; vortex identification ... See more keywords
Investigation of the Flow Field of a Ship in Planar Motion Mechanism Tests by the Vortex Identification Method
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Marine Science and Engineering"
DOI: 10.3390/jmse8090649
Abstract: Planar motion mechanism (PMM) tests provide a means of obtaining the hydrodynamic derivatives needed to assess ship maneuverability properties. In this paper, the self-developed computational fluid dynamic (CFD) solver based on the open source code… read more here.
Keywords: motion mechanism; vortex identification; identification; flow field ... See more keywords