Numerical Simulation of Water Entry with Improved SPH Method

Shao, Jiaru; Yang, Y.; Gong, Hengxiang; Liu, Moubin

doi:10.1142/s0219876218460040

Cited by 17 publications

(7 citation statements)

References 21 publications

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“…Our model is intended to simulate the complex multiphase interplay between ice and water mechanics during glacier calving. Although our water model has been extensively used in Smoothed Particle Hydrodynamics (SPH) free surface flow simulations of water and has been validated for several applications 32,[38][39][40] , solving incompressible Navier-Stokes equations using computational fluid dynamics would lead to more accurate results for the water dynamics 41 . Yet, it would also computationally be significantly more expensive and challenging to implement within the current hybrid solid-fluid numerical framework.…”

Section: Discussionmentioning

confidence: 99%

A glacier–ocean interaction model for tsunami genesis due to iceberg calving

Wolper

Gao

Lüthi

et al. 2021

Commun Earth Environ

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Glaciers calving icebergs into the ocean significantly contribute to sea-level rise and can trigger tsunamis, posing severe hazards for coastal regions. Computational modeling of such multiphase processes is a great challenge involving complex solid–fluid interactions. Here, a new continuum damage Material Point Method has been developed to model dynamic glacier fracture under the combined effects of gravity and buoyancy, as well as the subsequent propagation of tsunami-like waves induced by released icebergs. We reproduce the main features of tsunamis obtained in laboratory experiments as well as calving characteristics, the iceberg size, tsunami amplitude and wave speed measured at Eqip Sermia, an ocean-terminating outlet glacier of the Greenland ice sheet. Our hybrid approach constitutes important progress towards the modeling of solid–fluid interactions, and has the potential to contribute to refining empirical calving laws used in large-scale earth-system models as well as to improve hazard assessments and mitigation measures in coastal regions, which is essential in the context of climate change.

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Section: Discussionmentioning

confidence: 99%

A glacier–ocean interaction model for tsunami genesis due to iceberg calving

Wolper

Gao

Lüthi

et al. 2021

Commun Earth Environ

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“…The computed values of these parameters using different kernel functions and R S are given and compared with the experimental results [30] at t = 0.285 s in Table 2. KF2 for R S = 2.6L 0 gives accurate results, but the computational is about 478 s. The numerical accuracy of the hybrid kernel function [ KF1&KF2(2.6L 0 ) ] for different (22)…”

Section: Scott Russell Wave Generatormentioning

confidence: 99%

“…An improved version of I-SPH method based on the kernel gradient corrective tensor, a particle shifting algorithm and an improved periodic boundary condition was applied for modeling of rotary micropump mixers [21]. Numerical simulation of water entry with improved SPH method based on a new algorithm in fluid-solid interface treatment was conducted [22]. An efficient approach in order to take the air into account for accurate prediction of the responses of a damaged ship using a multi-phase SPH model combined with a dummy boundary method was introduced [23].…”

Section: Introductionmentioning

confidence: 99%

Improving efficiency of incompressible SPH method using a hybrid kernel function for simulation of free surface flows

Shobeyri¹

2018

J Braz. Soc. Mech. Sci. Eng.

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In this study, a hybrid kernel function including a flat and steep function is introduced to improve efficiency of incompressible SPH method for simulation of free surface flows. The governing equations including the mass and momentum conservations are solved in a Lagrangian form using a two-step fractional method. The solid boundary conditions in which water penetration across the walls is avoided can be imposed in the computations by solving a pressure Poisson equation on the wall particles. This treatment exerts a force on inner fluid particles to repulse these particles accumulating in the vicinity of the walls. Several lines of dummy particles are also placed outside the walls in the conventional SPH method. Arrangement of these particles can be difficult for complex boundary shapes and 3-D problems. Here, the steeper kernel function is employed for SPH approximation of the particles in the vicinity of the walls that models accurately the wall conditions without requiring to the dummy particles. Function approximation of the particles with larger distances from the walls is also performed by employing the flatter kernel function requiring lower computational times. This strategy based on the hybrid kernel function has both advantages of simpler modeling the wall conditions without penetration in the absence of dummy particles and lower computational times. The efficiency of the hybrid kernel function is verified for two benchmark free surface problems.

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“…The SPH method has an inherent advantage in solving strongly nonlinear problems of the water entry of the torpedo, induced by complex free surface splashing and large deformation. Lots of work has been conducted to improve the numerical accuracy and stability of the SPH method in capturing the moving boundary, the large deformation of the fluid, and the free surface breakage in water entry processes [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. However, there remain certain shortcomings in the SPH method.…”

Section: Introductionmentioning

confidence: 99%

Study on water entry of a 3D torpedo based on the improved smooth particle hydrodynamics method

Zhang,

Ding,

et al. 2023

Preprint

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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-solid coupling, which poses severe challenges to traditional mesh methods. The meshless smooth particle hydrodynamics (SPH) method shows unique advantages in capturing the complex features of the water entry of the torpedo. 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 accurately and efficiently investigate the water entry of the torpedo. This method integrates meshless point generation and adaptive techniques simultaneously. 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 at the initial stage and thereafter stabilize at 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 of the entry velocity. When the torpedo enters the water at different enter angles under the same initial enter velocity, both the vertical and the horizontal movements of the torpedo are observed, which results in more complex variations of 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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Numerical Simulation of Water Entry with Improved SPH Method

Cited by 17 publications

References 21 publications

A glacier–ocean interaction model for tsunami genesis due to iceberg calving

A glacier–ocean interaction model for tsunami genesis due to iceberg calving

Improving efficiency of incompressible SPH method using a hybrid kernel function for simulation of free surface flows

Study on water entry of a 3D torpedo based on the improved smooth particle hydrodynamics method

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