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

  • Special Column for Symposium on Vortex Identification Methods and Applications (Guest Editor Yu-Ning Zhang)
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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.

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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).

Author information

Authors and Affiliations

  1. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (Ministry of Education), School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, China

    Yu-ning Zhang & Xiao-yu Wang

  2. College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing, 102249, China

    Yu-ning Zhang

  3. Beijing Key Laboratory of Process Fluid Filtration and Separation, China University of Petroleum-Beijing, Beijing, 102249, China

    Yu-ning Zhang

  4. Department of Mathematics, University of Texas at Arlington, Arlington, 76019, Texas, USA

    Chaoqun Liu

Authors
  1. Yu-ning Zhang
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  2. Xiao-yu Wang
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  3. Yu-ning Zhang
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  4. Chaoqun Liu
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Corresponding author

Correspondence to Chaoqun Liu.

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 51606221, 51506051).

Biography: Yu-ning Zhang (1983-), Male, Ph. D., Associate Professor

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Zhang, Yn., Wang, Xy., Zhang, Yn. et al. Comparisons and analyses of vortex identification between Omega method and Q criterion. J Hydrodyn 31, 224–230 (2019). https://doi.org/10.1007/s42241-019-0025-1

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  • DOI: https://doi.org/10.1007/s42241-019-0025-1

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