POD analysis on vortical structures in MVG wake by Liutex core line identification

Dong, Xiangrui; Cai, Xiaoshu; Dong, Yinlin; Liu, Chaoqun

doi:10.1007/s42241-020-0037-x

Cited by 16 publications

(1 citation statement)

References 41 publications

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“…Xu et al found Liutex similarity, i.e., both the frequency and wavenumber spectrum of Liutex match the -5/3 law [14][15][16]. More reports on Liutex application can be found from [17][18][19][20][21][22][23][24][25][26][27][28][29] and four published books [30][31][32][33]. Liutex is considered as the vortex definition in this chapter.…”

Section: Introductionmentioning

confidence: 98%

Algorithm to Generate Liutex Core Lines Based on Forward Liutex Magnitude Gradient Lines

Yu,

Liu

2024

Vortex Simulation and Identification

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Vortex definition and identification are extremely important for the study of fluid dynamics research. Liutex is a newly proposed concept that correctly represents vortex. Liutex is a vector whose direction is the local rotation axis and whose magnitude is twice the angular speed. To identify the unique structure of a vortex, a method known as the Liutex Core Line method has been developed, which displays the rotational core axis of a vortex. However, the original method is a manual method, which is not practical for real application, and an automatic algorithm is required for practical usage. Xu et al. proposed an algorithm by selecting the best line from a group of candidate lines, which is an important progress. In this chapter, from another perspective to solve this problem, a new algorithm is introduced based on forward Liutex magnitude gradient lines. Since gradient lines have the feature that they advance to the local maximums, the route will still result in a unique line, which avoids the process to find the best line. This algorithm has achieved some success for the Lambda vortex in early boundary layer transition.

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