Acceleration effects in slamming and transition stages for the water entry of curved wedges with a varying speed

Wen, Xueliang; Buono, Alessandro Del; Liu, Peiqing; Qu, Qiulin; Iafrati, Alessandro

doi:10.1016/j.apor.2022.103294

Cited by 10 publications

(1 citation statement)

References 30 publications

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“…With the rapid development of computer technology, the numerical method has become a mainstream research method owing to its essential advantages of low cost and fast calculating speed compared to the other two methods. The traditional mesh-based numerical methods, such as the volume of fluid (VOF) [4,5], the finite volume method (FVM) [6], the boundary element method (BEM) [7], and the constrained interpolation profile (CIP) [8], are widely applied in simulating phenomena of fluid-structure interactions. However, meshes generated by these methods are prone to distortions, leading to inaccurate calculation results when applied to problems involving large deformations of free interfaces, such as the water entry of a torpedo.…”

Section: Introductionmentioning

confidence: 99%

Study on Water Entry of a 3D Torpedo Based on the Improved Smoothed Particle Hydrodynamics Method

Cai,

Wu,

Han

et al. 2024

Applied Sciences

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The water entry of a torpedo is a complex nonlinear problem, involving transient impact, free surface deformation, droplet splashing, and fluid–structure coupling, which poses severe challenges to traditional mesh methods. The meshless smoothed particle hydrodynamics (SPH) method shows unique advantages in capturing the complex features of the water entry of the torpedo at different entry angles. However, it still suffers from some inherent shortcomings, such as low surface discretization accuracy, poor discretization flexibility, and low calculation efficiency. In this study, an improved adaptive SPH algorithm is proposed to investigate the water entry of the torpedo accurately and efficiently. This method integrates meshless point generation and adaptive techniques simultaneously. The numerical results demonstrate that when the torpedo vertically enters the water at different velocities, the induced impact loads acting on the head of the torpedo fluctuate significantly with two peak values in the initial stage and thereafter stabilize in a later stage. The impact load acting on the torpedo, the entry depth of the torpedo, the splash height of the droplets, and the size of the cavity generated around the torpedo increase with the increment in the entry velocity. When the torpedo enters the water at different entry angles under the same initial entry velocity, both the vertical and the horizontal movements of the torpedo are observed, which results in more complex variations in parameters along the x- and y-axes. The findings and the corresponding numerical method in this study can provide a certain basis for the future designs of the entry trajectory and the structural bearing capacity of torpedoes.

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