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Effect of the vortical structures on the hydrodynamic performance of a pitching hydrofoil

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Abstract

The objective is to study the vortical structural behaviors of a transient pitching hydrofoil and their effects on the hydrodynamic performance. The pitching motion of the hydrofoil is set to pitch up with an almost constant rate from 5° to 15° and then back to 5°, with the Reynolds number 4.4×105 and the frequency 2 Hz. The results show that the main coherent structures around the pitching hydrofoil include small-scale laminar separation bubble (LSB), large-scale second vortex (SV) and trailing edge vortex (TEV) which are all vortical. The relationship between the vortical structure and the lift is investigated with the finite-domain impulse theory. It indicates that the major part of the lift is contributed by the LSB, whereas the shedding and the formation of the SV and TEV cause the fluctuation of the lift. The proper orthogonal decomposition (POD) method is applied to capture the most energetic modes, revealing that the LSB mode occupies a large amount of energy in the flow field. The dynamic mode decomposition (DMD) method accurately extracts the dominant frequency and modal characteristics, with the first mode corresponding to the mean flow, the second mode corresponding to the LSB structure and the third and fourth modes corresponding to the vortex shedding.

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Acknowledgements

This work was supported by the Bei**g Natural Science Foundation (Grant No. 3232033), the Fundamental Research Funds for the Central Universities (Grant No. 2023CX01004).

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Authors and Affiliations

  1. School of Mechanical Engineering, Bei**g Institute of Technology, Bei**g, 100081, China

    Rui Yuan, Hui-yun Hao, Qin Wu, Yun-qing Liu & Biao Huang

Authors
  1. Rui Yuan
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  2. Hui-yun Hao
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  3. Qin Wu
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  4. Yun-qing Liu
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  5. Biao Huang
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Correspondence to Qin Wu.

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Conflict of interest: The authors declare that they have no conflict of interest. Qin Wu is editorial board member for the Journal of Hydrodynamics and was not involved in the editorial review, or the decision to publish this article. All authors declare that there are no other competing interests.

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

Informed consent: Not application.

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 52279081, 51839001).

Biography: Rui Yuan (2000-), Female, Master Candidate

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Yuan, R., Hao, Hy., Wu, Q. et al. Effect of the vortical structures on the hydrodynamic performance of a pitching hydrofoil. J Hydrodyn 36, 406–420 (2024). https://doi.org/10.1007/s42241-024-0030-x

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  • DOI: https://doi.org/10.1007/s42241-024-0030-x

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