Experimental study on the effects of brash ice on the water-exit dynamics of an underwater vehicle

Zhang, Guiyong; You, Chuang; Haipeng, Wei; Sun, Tiezhi; Yang, Biye

doi:10.1016/j.apor.2021.102948

Cited by 19 publications

(2 citation statements)

References 21 publications

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“…Sun et al [5] conducted experiments in which a cone-shaped axisymmetric body exited the water and recorded the cavity evolution, motion features, and dynamic loads. Zhang et al [6] analyzed the velocity and pressure effects of water exit on an axisymmetric vehicle, with their experimental data showing that pressure fluctuations become more severe with increasing vertical exit velocity. Zan et al [7] described an experimental study of a porous structure hovering at different positions in the splash zone, providing reference data for the installation of similar structures and validation studies.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Cavity Structure Forced Water Exit from Calm Water at Constant Lifting Velocity

Zan

Ding

et al. 2023

JMSE

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In marine engineering, the installation of structures inevitably involves the process of water exit. This paper studies the vertical force, the shape of the free surface, and the evolution of the water entrained in a cavity in the process of lifting a structure, so as to provide guidance for practical engineering operations. Using a 1:8 experimental model, this paper derives the governing equations based on the Reynolds-averaged Navier–Stokes approach and uses the volume of fluid method to capture the shape change of the free surface. The vertical forces obtained at different lifting speeds are found to be in good agreement with the results of previous model tests. The results show that the numerical simulation method and mesh generation described in this paper can simulate the changes in the physical quantities associated with the structure in the process of water exit. The vertical force on the structure increases nonlinearly as the lifting speed rises, and the maximum lifting speed is conservatively estimated to be 0.034 m/s using the Det Norske Veritas recommended method. The maximum vertical force occurs as the whole structure leaves the water. The water entrained in the structure is mainly located at the sides and bottom. The lifting velocity plays an important role in the water exit process. The water exit force first increases and then decreases to a stable value as the lifting velocity increases, while the maximum water exit force increases nonlinearly.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Cavity Structure Forced Water Exit from Calm Water at Constant Lifting Velocity

Zan

Ding

et al. 2023

JMSE

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“…The velocity of projectile information processes in air and water entry should be investigated. Sun et al [ 29 , 30 ] analyzed the change of the missile’s velocity across the medium from different incident angles and water entry speeds, but their studies focused on the low-speed interval. Wang et al [ 31 ] analyzed the general law of EFP attenuation underwater.…”

Section: Introductionmentioning

confidence: 99%

Formation of Shaped Charge Projectile in Air and Water

Zhang

Wang

et al. 2022

Materials

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With the improvement of the antiknock performance of warships, shaped charge warheads have been focused on and widely used to design underwater weapons. In order to cause efficient damage to warships, it is of great significance to study the formation of shaped charge projectiles in air and water. This paper uses Euler governing equations to establish numerical models of shaped charges subjected to air and underwater explosions. The formation and the movement of Explosively Formed Projectiles (EFPs) in different media for three cases: air explosion and underwater explosions with and without air cavities are discussed. First, the velocity distributions of EFPs in the formation process are discussed. Then, the empirical coefficient of the maximum head velocity of EFPs in air is obtained by simulations of air explosions of shaped charges with different types of explosives. The obtained results agree well with the practical solution, which validates the numerical model. Further, this empirical coefficient in water is deduced. After that, the evolutions of the head velocity of EFPs in different media for the above three cases are further compared and analyzed. The fitting formulas of velocity attenuation of EFPs, which form and move in different media, are gained. The obtained results can provide a theoretical basis and numerical support for the design of underwater weapons.

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Modeling tail bubble dynamics during the launch of an underwater vehicle using the boundary element method

et al. 2022

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Experimental study on the effects of brash ice on the water-exit dynamics of an underwater vehicle

Cited by 19 publications

References 21 publications

Experimental and Numerical Investigation of Cavity Structure Forced Water Exit from Calm Water at Constant Lifting Velocity

Experimental and Numerical Investigation of Cavity Structure Forced Water Exit from Calm Water at Constant Lifting Velocity

Formation of Shaped Charge Projectile in Air and Water

Modeling tail bubble dynamics during the launch of an underwater vehicle using the boundary element method

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