Study of Underwater Vehicle's Wake in Seawater of Linearly Gradient Temperature and Density
- Wei Gu (Wuhan Second Ship Design and Research Institute) | Jin-Lan Zhang (Wuhan Second Ship Design and Research Institute) | Qing-Jie Meng (Wuhan Second Ship Design and Research Institute) | Liang Peng (Wuhan Second Ship Design and Research Institute) | Zhi-Ben Shen (Wuhan Second Ship Design and Research Institute) | Hai-Hua Deng (Wuhan Second Ship Design and Research Institute)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- Underwater vehicle's wake, dynamic mesh, VOF model, gradient temperature, gradient density
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- 12 since 2007
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The thermal characteristics of the underwater vehicles wake on the sea surface are the basic of the infrared counteraction techniques. The wake of the underwater vehicle is simulated in the seawater of linearly gradient temperature and density based on the VOF model and dynamic mesh technology. The results show that due to the disturbance of the underwater vehicle, cold water in the higher depth is stirred up to the sea surface. Thus, cold characteristic of the wake can be observed on the sear surface, which is significant enough to be detected by the infrared detector. Along with temperature type wake, the wave type wake can also be observed obviously. Besides, the surface wakes for the cases of the underwater vehicle with/without the propeller are much different.
When the underwater vehicle is sailing in the sea of gradient temperature and density, it is able to cause the thermal wake on the sea surface by disturbing the temperature field as well as the sea surface wave due to the hydrodynamic force (Meunier and Spedding, 2005; Wu, Gong and Yuan, 2011). The thermal wake and the hydrodynamic wake on the sea surface are the basic of infrared anti-underwater vehicle technique and radar anti-underwater vehicle technology (for example, via synthetic aperture radar), respectively. As a result, finding out the characteristics of the underwater vehicle's wake on the sea surface is important for the development of anti-underwater vehicle techniques, and draws more and more countries attentions in the last two decades.
There have been a lot of works on the study of the underwater vehicle's wake, including experiments in laboratories and simulations via computers (Chang and Hong, 2006; Chen, Zhong and Sun, 2014). However, most of these works were conducted in the water of constant temperature and density, which is different from the actual sea environment. In the actual sea environment, the water temperature decreases with depth. For the underwater vehicle in the water of constant temperature, the thermal wake on the water surface will be the kind of hot due to the cooling water exhausted from the underwater vehicle, and the caused temperature difference is too small to be detected by the infrared detector. However, the cold wake on the sea surface will be observed when the underwater vehicle is sailing in the water of gradient temperature and the characteristic of that cold wake is easily to be detected by infrared detector. The cold wake is caused by the stirring of underwater vehicle, which pushes the cold water in higher depth up to the sea surface. Thus, setting correct sea environment is the key of the study of the underwater vehicle's wake.
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