Local flow at plate edge during water entry

Sun, Shiyan; Wu, G.X.

doi:10.1063/5.0013914

Cited by 14 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cavity evolution and its final collapse are strongly dependent on gravity (see Bao, Wu & Xu 2016). We do not consider also other impact configurations, such as wave impact and a floating plate impact, where gravity can provide an important contribution (see Sun & Wu 2020).…”

Section: Introductionmentioning

confidence: 99%

Gravity effect on water entry during an early stage

2021

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Gravity effect on water entry during an early stage

2021

View full text Add to dashboard Cite

show abstract

“…As a further discussion of the influence of fluid compressibility, an incompressible solution obtained by the BEM (Wu et al. 2004; Sun & Wu 2013, 2020) is also presented in figure 18( b ). Since the BEM is based on the assumption of an incompressible fluid, the BEM cannot obtain converged and accurate results in the early impact stage where shock waves are generated in water.…”

Section: Numerical Validation and Discussionmentioning

confidence: 99%

“…To compare the influence of fluid compressibility, the BEM (Wu et al. 2004; Sun & Wu 2013, 2020; Han et al. 2022; Zhang et al.…”

Section: Figure 27mentioning

confidence: 99%

Investigation of hydrodynamics of water impact and tail slamming of high-speed water entry with a novel immersed boundary method

et al. 2023

View full text Add to dashboard Cite

High-speed water entry is a transient hydrodynamic process that is accompanied by strongly compressible flow, free surface splash, cavity evolution and other nonlinear hydrodynamic phenomena. To address these problems, a novel fluid–structure interaction (FSI) scheme based on the immersed boundary method is proposed which is suitable for strongly compressible multiphase flows. In this scheme, considering the multiphase interfaces at the immersed boundary, an improved immersed boundary method for effectively suppressing the non-physical force oscillation is proposed. Additionally, a quaternion-based six degrees of freedom motion system is used to describe rigid body motion, and the multiphase flow Eulerian finite element method is applied as the fluid solver. Using analytical solutions, experimental data and literature data, the accuracy and robustness of the FSI scheme are validated. Finally, the high-speed water entry of the slender body with different noses is investigated, and the hydrodynamic loads including the axial and normal drag forces and the bending moment are extensively discussed. The hydrodynamic load and motion trajectory are determined by the nose configuration. The tail slamming phenomenon is the primary focus, and it is revealed that its formation is primarily related to the pitch moment formed at the stage of crossing the free surface. Tail slamming also causes violent impact loads, especially bending moments, which may cause slender projectiles to break off. Finally, to combine the features of the flat and hemispherical noses, the water entry of the projectile with a truncated hemispherical nose is simulated and discussed.

show abstract

“…[9][10][11][12][13] (2) Naval engineering: Water entry phenomena are significant in areas like ship launching, slamming (impact of a ship hull with waves), and the development of naval weapons. [13][14][15][16][17][18][19][20][21] (3) Aerospace and aeronautical engineering: Water entry studies are relevant to seaplane and spacecraft landing, air-to-water weapons, and they offer insight into the behavior of bombs during water impact. [22][23][24][25][26] Phys.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, several researchers have also focused on investigating water entry phenomena involving objects with non-spherical geometries. Examples of such objects include conical and wedge-shaped projectiles, [37][38][39][40][41][42][43] flat plates, 1,14,[44][45][46][47][48] vertical cylindrical and slender bodies, 8,32,[49][50][51][52] bodies with asymmetric nose shapes, 53 and thick and thin hollow objects. [54][55][56][57][58] Moreover, studies have explored the water entry behavior of objects with more complex geometries, such as 3D-printed birds and teardrop-shaped objects.…”

Section: Introductionmentioning

confidence: 99%

Parallel water entry: Experimental investigations of hydrophobic/hydrophilic spheres

Akbarzadeh,

Krieger,

Hofer

et al. 2023

Physics of Fluids

View full text Add to dashboard Cite

This study aims to experimentally investigate the vertical parallel water entry of two identical spheres (in geometry and material) with different surface wettability (hydrophilic or hydrophobic) pairings. The spheres simultaneously impact the water surface with velocities ranging from 1.71 to 4.32 m s−1. The corresponding ranges of the impact Froude, Weber, and Reynolds numbers are 3.87–9.75, 816–5167, and 38.5×103 to 96.8×103, respectively. The spheres' lateral distances vary from 1.0 to 5.0 times the diameter. A high-speed photography system and image processing technique analyze the event dynamics, focusing on air-entrainment cavity behavior (shapes, closure, shedding), water flow features (Worthington jets, splashes), and sphere kinetics. Results for hydrophobic/hydrophobic cases show that even at the maximum lateral distance, a slightly asymmetric cavity forms, but deep-seal pinching occurs at a single point, similar to a single water entry scenario. As the lateral distance decreases, the spheres significantly influence each other's behavior, leading to the formation of a highly asymmetric air cavity and an oblique Worthington jet. In the case of a hydrophobic/hydrophilic pairing, vortices generated behind the hydrophilic sphere influence the air cavity development of the hydrophobic sphere. This can cause a secondary pinch-off, especially at low lateral distances. This effect becomes more pronounced at higher impact velocities. Additionally, at higher impact velocities and minimum lateral distance (direct contact between the spheres), a smaller cavity detaches from the hydrophobic sphere's cavity, attaches to the hydrophilic sphere, and moves with it. These different regimes result in varying descent velocities for the spheres.

show abstract

Local flow at plate edge during water entry

Abstract: The translational and rotational motions of a cylindrical particle in a granular shear flow inside a split bottom Couette cell Physics of Fluids 32, 073310 (2020);

Cited by 14 publications

References 16 publications

Gravity effect on water entry during an early stage

Gravity effect on water entry during an early stage

Investigation of hydrodynamics of water impact and tail slamming of high-speed water entry with a novel immersed boundary method

Parallel water entry: Experimental investigations of hydrophobic/hydrophilic spheres

Contact Info

Product

Resources

About