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Time-frequency analysis of internal waves generated by a towed and self-propelled submerged body model

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Abstract

The spectrogram, based on a short-time Fourier transform, can visualize the time-dependent frequency spectrum of waves and is easy to compute. This time-frequency analysis method provides crucial information about waves generated by moving vessels and has been utilized to analyze Kelvin ship waves and internal waves. To further study the internal waves induced by a submerged body, an experiment is conducted for the towed and self-propelled SUBOFF model in a stratified fluid. The internal wave elevation signals are captured using electronic conductivity probes. Comparing with the calculation results of theoretical model, the high-frequency component of internal waves is identified. The high-frequency component has the exact same characteristics in both the towed and self-propelled model experiment and is consistent with the theoretical results for all Froude numbers. Therefore, this component is composed mainly of lee waves. Through spectral characteristics identification, a low-frequency component is discovered in the spectrogram in addition to the lee wave component. The intensity of the low-frequency component is tightly related to the vortex structure behind the submerged body. The vortex structure depends on the net momentum imparted by the submerged body. Therefore, this component is composed mainly of wake waves induced by the vortex structure.

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Acknowledgment

This work was supported by the Natural Science Foundation of Hainan Provincial (Grant No. 520MS071).

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Authors and Affiliations

  1. Zhengzhou Electromechanical Engineering Research Institute, Zhengzhou, 450015, China

    Yu-hang Li, Fei-yu Chen & Li-ping Qin

  2. Henan Key Laboratory of Underwater Intelligence Equipment, Zhengzhou, 450015, China

    Yu-hang Li, Fei-yu Chen & Li-ping Qin

  3. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Ke Chen & Yun-xiang You

  4. Yazhou Bay Institute of Deepsea Technology, Shanghai Jiao Tong University, Shanghai, 200240, China

    Ke Chen & Yun-xiang You

Authors
  1. Yu-hang Li
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  2. Fei-yu Chen
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  3. Li-ping Qin
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  4. Ke Chen
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  5. Yun-xiang You
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Corresponding author

Correspondence to Yun-xiang You.

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Conflict of interest: The authors declare that they have no conflict of interest. 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: Informed consent was obtained from all individual participants included in the study.

Additional information

Project supported by the and the National Natural Science Foundation of China (Grant Nos. 51979279, 52275138).

Biography: Yu-hang Li (1995-), Male, Ph. D.

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Li, Yh., Chen, Fy., Qin, Lp. et al. Time-frequency analysis of internal waves generated by a towed and self-propelled submerged body model. J Hydrodyn 35, 1191–1207 (2023). https://doi.org/10.1007/s42241-024-0093-8

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  • DOI: https://doi.org/10.1007/s42241-024-0093-8

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