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Volume 30 Issue 3
Jul  2022
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Article Navigation >  Journal of Unmanned Undersea Systems  > 2022  >  30(3): 283-291
YU Jun, CHU Dong-yang, WANG Hai-kun, SHEN Chao, SHEN Wen-ni, YU Yang. Characteristic Analysis of Cavitation Load Near Free Surfaces in Underwater Explosions[J]. Journal of Unmanned Undersea Systems, 2022, 30(3): 283-291. doi: 10.11993/j.issn.2096-3920.2022.03.002
Citation: YU Jun, CHU Dong-yang, WANG Hai-kun, SHEN Chao, SHEN Wen-ni, YU Yang. Characteristic Analysis of Cavitation Load Near Free Surfaces in Underwater Explosions[J]. Journal of Unmanned Undersea Systems, 2022, 30(3): 283-291. doi: 10.11993/j.issn.2096-3920.2022.03.002
shu

Characteristic Analysis of Cavitation Load Near Free Surfaces in Underwater Explosions

doi: 10.11993/j.issn.2096-3920.2022.03.002

  • 1. China Ship Scientific Research Center, Wuxi 214082, China;

  • 2. Taihu Laboratory of Deepsea Technology Science, Wuxi 214082, China

  • Received Date: 2021-12-15
    Available Online: 2022-07-18
    Abstract
  • Cavitation near free surfaces in underwater explosions has a significant influence on shockwave propagation, explosion bubble movement, and structure impact damage. Currently, the one-fluid model is widely used to analyze cavitation. However, it is difficult to accurately obtain the collapse load during the process of cavitation evolution and characteristics of the flow field in the cavitation domain. In this paper, a four-equation model considering phase transition is introduced. The second-order MUSCL-Hancock reconstruction scheme and HLLC approximate Riemann solver are adopted to solve the homogeneous hyperbolic equation and then the Newton iterative method is used to solve the phase transition equation. The proposed method was preliminarily verified through underwater explosion tests near a free surface, and the typical motion pattern and internal pressure load characteristics in the cavitation domain were captured. The effects of different explosion depths and charge weights on cavitation load characteristics were explored. The results indicate that the pressure in the cavitation domain has a wide distribution that is not maintained near the constant saturated vapor pressure. The results of this paper can provide a reference for further studies on underwater explosions cavitation.

     

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