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A modified-Liutex-based vortex-core-line extractor and its application

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Abstract

Vortices, which appear as swirling behaviour of a flow field, are an important phenomenon in fluid dynamics, and the extraction of vortex cores is necessary for the research of vortex evolution in many areas of fluid mechanics. The Liutex method is a milestone in vortex identification and provides a reasonable mathematical definition for a vortex core. Based on this definition, a novel integration-based method is presented, which can reduce the numerical error in the integration process through location optimization. Two typical test cases, the wake vortices of an A320 in the near-ground stage and a helicopter rotor, are examined to show that the proposed method can extract continuous vortex core lines with accuracy and efficiency for vortex parameter study.

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Acknowledgement

(This research received other funding agency in the public, commercial, or not-for-profit sectors.)

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Authors and Affiliations

  1. School of Aeronautics, Northwestern Polytechnical University, Xi’an, 710072, China

    Jin-yan Cai, Dong Li, Zi-ming Xu, Ze-yu Zhang & Jiao-lin Cui

  2. High Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang, 621000, China

    Jin-yan Cai

Authors
  1. Jin-yan Cai
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  2. Dong Li
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  3. Zi-ming Xu
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  4. Ze-yu Zhang
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  5. Jiao-lin Cui
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Corresponding author

Correspondence to Dong Li.

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Conflict of interest: The authors declare that they have no conflict of interest.

Ethical approval: This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent: Informed consent was obtained from all individual participants included in the study.

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. U173320010, 11802328).

Biography: Jin-yan Cai (1998-), Male, Ph. D. Candidate

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Cai, Jy., Li, D., Xu, Zm. et al. A modified-Liutex-based vortex-core-line extractor and its application. J Hydrodyn 35, 811–824 (2023). https://doi.org/10.1007/s42241-023-0060-9

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  • DOI: https://doi.org/10.1007/s42241-023-0060-9

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