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Numerical investigation on the flow structures during vertical water-entry of a sphere
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Zhi-pu GUO1, Biao HUANG1, 2, Qin WU1, 2, Da-qin LI3, Tao-tao LIU1, 2
Journal of Ship Mechanics | 2024, 28(8) : 1141 - 1154
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Journal of Ship Mechanics | 2024, 28(8): 1141-1154
• Hydrodynamics •
Numerical investigation on the flow structures during vertical water-entry of a sphere
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Zhi-pu GUO1, Biao HUANG1, 2, Qin WU1, 2, Da-qin LI3, Tao-tao LIU1, 2
Affiliations
  • 1.School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
  • 2.Chongqing Innovation Center, Beijing Institute of Technology, Chongqing 401120, China
  • 3.The System Design Institute of Mechanical-Electrical Engineering, Beijing 100854, China
Published: 2024-08-20 doi: 10.3969/j.issn.1007-7294.2024.08.002
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Based on the boundary data immersion method (BDIM) and the fluid-structure coupling algorithm for rigid body motions, a numerical program for the vertical water-entry of a sphere was developed. The accuracy and effectiveness of the numerical method were verified by comparison with the experimental results. Based on the analysis of the numerical calculation results, the cavity development and corresponding flow structures with different impact velocities during vertical water entry, as well as the development of the splash were obtained. Different vortex identification criteria were adopted to investigate the development of vortex structures. The results show that the impact velocity of the sphere has a significant effect on the closure of the splash, the cavity shape and the evolution of the flow structures inside the cavity. The Q criterion can identify the complex vortex structure more accurately, and the entry velocity of the sphere will affect the vortex intensity inside the cavity.

water-entry  /  cavitation  /  flow characteristics  /  impact velocity  /  numerical simulation
Zhi-pu GUO, Biao HUANG, Qin WU, Da-qin LI, Tao-tao LIU. Numerical investigation on the flow structures during vertical water-entry of a sphere[J]. Journal of Ship Mechanics, 2024 , 28 (8) : 1141 -1154 . DOI: 10.3969/j.issn.1007-7294.2024.08.002
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Article Info
doi: 10.3969/j.issn.1007-7294.2024.08.002
  • Receive Date：2024-02-18
  • Online Date：2026-03-26
  • Published：2024-08-20
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  • Received：2024-02-18
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Affiliations
    1.School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
    2.Chongqing Innovation Center, Beijing Institute of Technology, Chongqing 401120, China
    3.The System Design Institute of Mechanical-Electrical Engineering, Beijing 100854, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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