Numerical prediction of slamming on bow-flared section considering geometrical and kinematic asymmetry

Xie, Hang; Ren, Huilong; Li, Hui; Tao, Kaidong

doi:10.1016/j.oceaneng.2018.04.033

Cited by 28 publications

(5 citation statements)

References 22 publications

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“…In the numerical simulation of water entry problems, different flow models have been adopted in the previous studies [22] [35]. For the water entry of a two-dimensional wedge, Johannessen compared the impact pressure and the impact force of different flow models by using the CFD solver StarCCM+, and found that the selection of flow models has little effect on the impact loads.…”

Section: Results and Discussion Confrontation Of Numerical Results With Experimental Datamentioning

confidence: 99%

“…The water entry of the ship-like section is numerically studied by using the commercial Computational Fluid Dynamics (CFD) solver StarCCM+ software [30]. The two fluids (water and air) are assumed to be immiscible and incompressible [22] [25]. The interface between air and water is captured by using the VOF technique and the High-Resolution Interface Capturing (HRIC) scheme [31][32].…”

Section: Numerical Model Numerical Methodsmentioning

confidence: 99%

“…Impact forces, impact pressures and vertical accelerations were measured in the tests. In subsequent studies, many numerical methods were validated using these tests, including the Boundary Element Method [18][19], the Constrained Interpolation Profile method [20], the Arbitrary Lagrangian-Eulerian method [21], and the Finite Volume Method [22]. Free-fall drop tests of a symmetry bow-flare ship section were performed in the Wave Induced Loads on Ships (WILS) Joint Industry Project [23], which was conducted by the Korea Research Institute of Ships and Ocean Engineering (KRISO).…”

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confidence: 99%

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Experimental Study and Numerical Simulation of the Water Entry of a Ship-Like Symmetry Section with an Obvious Bulbous Bow

Wang

Zhang

et al. 2021

Polish Maritime Research

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A bulbous bow is a typical ship structure. Due to the influence of the bulbous bow, complex flow separation and gas capture phenomena may appear during the water entry of ship-like sections. In this paper, experimental and numerical studies on the water entry of a ship-like section with an obvious bulbous bow are carried out. Two thin plates are installed at both ends of the test model to ensure that the flow field during the impact process is approximately two-dimensional. The free-fall drop test is carried out in the test rig equipped with guide rails. By changing drop heights, impact pressure on the model surface with different initial impact velocities is measured. A numerical model for simulating the water entry of the ship-like section is established by using the Computational Fluid Dynamics (CFD) method, based on the Navier-Stokes equations. Reasonable time steps and mesh size are determined by convergence analysis. Four different flow models are used in the numerical analysis. It is found that the K-Epsilon turbulence model can present the most reasonable numerical prediction by comparing numerical results with the experimental data. Furthermore, the influence of the bulbous bow on the impact loads is numerically studied by using the validated numerical model. It suggests that the bulbous bow has little effect on the impact force acting on the bow-flared area but, in the position near the bulbous bow, the pressure will be affected by the second slamming and the air cushion.

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Section: Results and Discussion Confrontation Of Numerical Results With Experimental Datamentioning

confidence: 99%

Section: Numerical Model Numerical Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Experimental Study and Numerical Simulation of the Water Entry of a Ship-Like Symmetry Section with an Obvious Bulbous Bow

Wang

Zhang

et al. 2021

Polish Maritime Research

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“…Research on the aircraft water entry motion attitude and head shape on the water entry drag and bang load characteristics is still insufficient. In this paper, the VOF multiphase flow model and standard k-epsilon turbulence model in Fluent, combined with dynamic mesh technology [21], are used to carry out the three-dimensional numerical simulation of the unmanned aerial vehicle (UAV) trans-media water ingress and analyze the effects of velocity, angle, angle of attack, and head shape on the slamming load on the fuselage in the process of the vehicle's water ingress to provide references for UAVs and other aerial vehicles to enter water trans-media and the optimization of their fuselage structural strength design.…”

Section: Introductionmentioning

confidence: 99%

Research of Slamming Load Characteristics during Trans-Media Aircraft Entry into Water

Liu,

Tan,

Zhang

et al. 2024

Drones

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The trans-media aircraft water entry process generates strong slamming loads that will seriously affect the stability and safety of the aircraft. To address this problem, we design a fixed-wing aircraft configuration and employ numerical simulations with the volume of fluid (VOF) multiphase flow model, standard k-epsilon turbulence model, and dynamic mesh technique. We explore the characteristics of aircraft subjected to bang loads under different conditions. The results show the following: the pressure load on the aircraft surface increases with higher water entry velocity; larger entry angles lead to more drastic changes in the aircraft’s drag coefficient, demonstrating strong nonlinear characteristics; the greater the angle of attack into the water, the greater the pressure load on the root underneath the wing, with little effect on the pressure load on the head; and the water entry drag coefficient and average pressure load follow an increasing order of conical head, hemispherical head, and flat head. These findings provide theoretical references for studying the load characteristics during trans-media water entry of various flying bodies and optimizing fuselage structural strength.

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“…Regarding the moving grid method, Nguyen and Park (2016) combined a curvilinear body-fitted grid-based N-S equation solver with the volume of fluid (VOF) method to simulate water entry of a hemisphere. Xie et al (2018 simulated the water entry of a freely falling bow-flared ship section using the commercial software Fluent. Using OpenFOAM, Wang et al (2021) studied the symmetric and asymmetric water entry of a wedge with the consideration of waves.…”

Section: Introductionmentioning

confidence: 99%

Parametric studies on the water impact of one and twin free-falling wedges by a Cartesian grid multiphase flow model

et al. 2022

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Numerical prediction of slamming on bow-flared section considering geometrical and kinematic asymmetry

Cited by 28 publications

References 22 publications

Experimental Study and Numerical Simulation of the Water Entry of a Ship-Like Symmetry Section with an Obvious Bulbous Bow

Experimental Study and Numerical Simulation of the Water Entry of a Ship-Like Symmetry Section with an Obvious Bulbous Bow

Research of Slamming Load Characteristics during Trans-Media Aircraft Entry into Water

Parametric studies on the water impact of one and twin free-falling wedges by a Cartesian grid multiphase flow model

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