It is found that Liutex has more advantages than λ 2 , Q and Ω in 2D vortex statistics.Liutex and Third Generation of Vortex Definition and Identificationdoi:10.1007/978-3-030-70217-5_13Yuxian Xia
The Q, λ2, Liutex, Omega (Ω) and Omega-Liutex (ΩR) methods are adopted for the identification of vortex structures in the forced homogeneous isotropic turbulence (FHIT) with/without the polymer additive, respectively. The comparison among these five methods shows that the threshold values ...
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In this work, the intermittency and power-law similarity of the Liutex vector in homogeneous, isotropic turbulence and a turbulent channel are explored. First, we found that the Liutex vector is more intermittent than the vorticity vector in the considered turbulent flows, which indicates that an ...
Compared with iso-surface based methods, the Liutex core line method is shown to be precise, free of threshold and capable to capture both strong and weak vortices simultaneously. Tollmien-Schlichting (T-S) waves in the linear growth region, Λ— and hairpin vortices in the transition region ...
This chapter presents several applications of Liutex in turbulence research, including Liutex similarity, multilevel vortex structures and asymmetry in turbulent boundary layer. A -5/3 law of Liutex similarity is found in the wall bounded turbulence, which is independent of Reynolds number and does ...
The current chapter focuses on utilizing both the Liutex iso-surface and LXC-core line methods to revisit and study the vortex kinematics in the bypass transition. In particular, the hairpin formation mechanisms are well understood in terms of revealing a brand-new path, namely the fourth ...
Liutex core lineproper orthogonal decomposition(POD)analysisK-H instabilityLambda vortexHairpin vortIn this study, the new method of the vortex core line based on Liutex definition, also known as Liutex core line, is applied to support the hypothesis that the vortex ring is not a part of the...
hairpin vortexmoving single-frame and long-exposuremoving particle image velocimetry(PIV)Liutex vortex identification methodThe spatiotemporal evolution of hairpin vortex structures in a fully developed turbulent boundary layer is investigated qualitatively and quantitatively by using two image methods.In this...
LiutexdirectnumericalsimulationThe characteristics of the acceleration a and its correlation with the vortex core in the swirling flow are analyzed in this paper. The swirling flows of four swirl numbers ( S n = n S 0, 0.10, 0.20 and 0.36) are simulated by the direct numerical simulation, ...