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Journal of Hydrodynamics

, Volume 31, Issue 2, pp 224–230 | Cite as

Comparisons and analyses of vortex identification between Omega method and Q criterion

  • Yu-ning Zhang
  • Xiao-yu Wang
  • Yu-ning Zhang
  • Chaoqun LiuEmail author
Special Column for Symposium on Vortex Identification Methods and Applications (Guest Editor Yu-Ning Zhang)

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 flow statistics, some important conclusions are drawn on the validity of the two methods, as follows. The omega method can identify various kinds of vortices with different intensities (e.g., the strong vortex, the medium vortex and the weak vortex). For the Q criterion, due to the subjective threshold selection, only the strong vortex with weak deformations could be identified. Finally, some emerging topics related with the advanced vortex identification methods are briefly discussed.

Key words

Vortex identification Galilean invariant Omega method 

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Notes

Acknowledgement

This work was supported by the Foundation of Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (Ministry of Education), North China Electric Power University (Grant No. NDZG201807).

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Copyright information

© China Ship Scientific Research Center 2019

Authors and Affiliations

  • Yu-ning Zhang
    • 1
  • Xiao-yu Wang
    • 1
  • Yu-ning Zhang
    • 2
    • 3
  • Chaoqun Liu
    • 4
    Email author
  1. 1.Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (Ministry of Education), School of Energy, Power and Mechanical EngineeringNorth China Electric Power UniversityBeijingChina
  2. 2.College of Mechanical and Transportation EngineeringChina University of Petroleum-BeijingBeijingChina
  3. 3.Beijing Key Laboratory of Process Fluid Filtration and SeparationChina University of Petroleum-BeijingBeijingChina
  4. 4.Department of MathematicsUniversity of Texas at ArlingtonArlingtonUSA

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