Experimental study on oblique water entry of two tandem spheres with collision effect

Yun, Honglu; Lyu, Xujian; Wei, Zhaoyu

doi:10.1007/s12650-019-00602-4

Cited by 22 publications

(4 citation statements)

References 15 publications

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“…While the aforementioned studies focused on a single object, the evolution of supercavitation will be different when two objects are fired in parallel or successively [13][14][15]. Xu et al [16] numerically determined the evolution of wake vortexes and the interaction between vortexes and objects under varying speeds and emission sequences.…”

Section: Introductionmentioning

confidence: 99%

Research of the Influence of Lateral Inflow Angles on the Cavitation Flow and Movement Characteristics of Underwater Moving Objects

Xie,

Jia,

Chen

et al. 2024

Processes

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This study examined the multi-phase flow field for a single object and two parallel/series objects under different incoming angles of lateral flow. The volume of fluid model, the Sauer–Schnerr cavitation model, and the six degrees of freedom (DOF) method were adopted to consider simulations of multi-phase flow, phase change, and object movement, respectively. The results show that, for a single object, the degree of asymmetry in the cavity profile depends on the component (the z-component) of the lateral inflow velocity in the direction perpendicular to the initial velocity of the object. As this component increases, the asymmetry of the cavity increases. The cavity length is related to the relative axial speed between the object and the water. For parallel objects, the cavity asymmetry is determined by the superimposed influence of the z-component of the lateral incoming speed and the high-pressure zone induced by the nearby object. The object located downstream relative to the lateral flow has a stronger cavity asymmetry than that of the upstream object, and the trajectory of the downstream object is more easily deviated than that of the upstream object. For tandem objects, with the increase in the lateral incoming angle, the supercavity length increases after the rear object enters into the front cavity. With the increase in the z-component of the lateral flow velocity, the deviation speed increases.

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Section: Introductionmentioning

confidence: 99%

Research of the Influence of Lateral Inflow Angles on the Cavitation Flow and Movement Characteristics of Underwater Moving Objects

Xie,

Jia,

Chen

et al. 2024

Processes

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“…In 2020, Yun et al 80 conducted an experimental study to investigate the hydrodynamic features associated with oblique water entry of two tandem spheres. Their research revealed the formation of a suction region within the cavity created by the front sphere.…”

Section: Introductionmentioning

confidence: 99%

Parallel water entry: Experimental investigations of hydrophobic/hydrophilic spheres

Akbarzadeh,

Krieger,

Hofer

et al. 2023

Physics of Fluids

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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.

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“…(2019) studied the water entry of a linear array of magnetic spheres focusing on the cavity shape of the array. Yun, Lyu & Wei (2019) showed that oblique two sphere entry resulted in contact with the cavity wall and eventual collision of the two spheres, but neither study focuses on the hydrodynamic forces involved. We measure the forces of water entry through an accelerometer embedded in the upper sphere which provides time-resolved measurements of the impact force.…”

Section: Introductionmentioning

confidence: 99%

Impact force reduction by consecutive water entry of spheres

et al. 2021

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Experimental study on oblique water entry of two tandem spheres with collision effect

Cited by 22 publications

References 15 publications

Research of the Influence of Lateral Inflow Angles on the Cavitation Flow and Movement Characteristics of Underwater Moving Objects

Research of the Influence of Lateral Inflow Angles on the Cavitation Flow and Movement Characteristics of Underwater Moving Objects

Parallel water entry: Experimental investigations of hydrophobic/hydrophilic spheres

Impact force reduction by consecutive water entry of spheres

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