Numerical investigation of wake-collapse internal waves generated by a submerged moving body -- Journal of Oceanology and Limnology,2017,35(4):967-977

	Cite this paper:
	LIANG Jianjun, DU Tao, HUANG Weigen, HE Mingxia. Numerical investigation of wake-collapse internal waves generated by a submerged moving body[J]. Journal of Oceanology and Limnology, 2017, 35(4): 967-977

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

LIANG Jianjun¹, DU Tao², HUANG Weigen³, HE Mingxia¹

1 Ocean Remote Sensing Institute, Ocean University of China, Qingdao 266003, China;
2 College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266003, China;
3 Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

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.

Key words: wake-collapse internal wave|generation|property|oceanic stratification|propeller-driven body

Received: 2016-02-05 Revised: 2016-04-26

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Articles by LIANG Jianjun

Articles by DU Tao

Articles by HUANG Weigen

Articles by HE Mingxia

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