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Numerical investigation of wake-collapse internal waves generated by a submerged moving body

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Abstract

The state-of-the-art OpenFOAM technology is used to develop a numerical model that can be devoted to numerically investigating wake-collapse internal waves generated by a submerged moving body. The model incorporates body geometry, propeller forcing, and stratification magnitude of seawater. The generation mechanism and wave properties are discussed based on model results. It was found that the generation of the wave and its properties depend greatly on the body speed. Only when that speed exceeds some critical value, between 1.5 and 4.5 m/s, can the moving body generate wake-collapse internal waves, and with increases of this speed, the time of generation advances and wave amplitude increases. The generated wake-collapse internal waves are confirmed to have characteristics of the second baroclinic mode. As the body speed increases, wave amplitude and length increase and its waveform tends to take on a regular sinusoidal shape. For three linearly temperature-stratified profiles examined, the weaker the stratification, the stronger the wake-collapse internal wave.

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Acknowledgment

The work was carried out at the National Supercomputer Center in Tianjin, and calculations were performed on supercomputer TianHe-1(A).

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Authors and Affiliations

  1. Ocean Remote Sensing Institute, Ocean University of China, Qingdao, 266003, China

    Jianjun Liang  (梁建军) & Mingxia He  (贺明霞)

  2. College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, 266003, China

    Tao Du  (杜涛)

  3. Second Institute of Oceanography, State Oceanic Administration, Hangzhou, 310012, China

    Weigen Huang  (黄韦艮)

Authors
  1. Jianjun Liang  (梁建军)
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  2. Tao Du  (杜涛)
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  3. Weigen Huang  (黄韦艮)
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  4. Mingxia He  (贺明霞)
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Corresponding author

Correspondence to Jianjun Liang  (梁建军).

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Supported by the State Key Program of National Natural Science of China (No. 60638020)

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Liang, J., Du, T., Huang, W. et al. Numerical investigation of wake-collapse internal waves generated by a submerged moving body. Chin. J. Ocean. Limnol. 35, 967–977 (2017). https://doi.org/10.1007/s00343-017-6041-5

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  • DOI: https://doi.org/10.1007/s00343-017-6041-5

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