Water Entry and Exit of a Horizontal Circular Cylinder

Zhu, Xinying; Faltinsen, Odd M.; Hu, Changhong

doi:10.1115/1.2199558

Cited by 74 publications

(23 citation statements)

References 4 publications

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“…6 that the rupture of the cavity film is expected to produce the three-dimensionality on the film due to the surface tension along the surface of the cylinder. Hence, this observation gives an informative findings for the development of cavity dynamics on the water entry of a horizontal cylinder, where the previous studies in this situation have ever been restricted to the two-dimensional problem (see the computational studies [28][29][30][31]34] and relevant analytical works [21][22][23]). Figure 7 shows the selected snapshots of the cavity film breaking off from the hydrophobic aluminum (dense) cylinder.…”

Section: Resultsmentioning

confidence: 97%

“…After the object is completely immersed in water, the perturbation analysis based on Wagner's analysis can be no longer valid where the resulting cavity fully grows behind the object. To investigate the cavity evolution due to water entry of a horizontal cylinder, several experimental treatments have been carried out by Greenhow [28], Lin & Shieh [29] and Zhu et al [30], whereas Zhang et al [31] implemented a level-set method with immersed boundary method on this situation. So far, the water-entry problem of a circular cylinder has been entirely studied within the 2D treatment, and the three-dimensionality of the resulting cavity in the spanwise direction has been left.…”

Section: Introductionmentioning

confidence: 99%

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Rupture of Cavity Film Due to Water Entry of Horizontal Superhydrophobic Circular Cylinders

Ueda¹,

Iguchi

2013

High Temperature Materials and Processes

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In materials refining processes such as steelmaking process, bath-entry of agents such as CaCO 3 attracts career gas around their entire surface so that the dispersion in the bath can be inhibited. To shed light on the still vague instant phenomenon, this study employs a water model experiment and carries out the visualization. Therefore, this study visually demonstrates the growth and rupture of air cavity due to water entry of horizontal superhydrophobic circular cylinders with the aid of a high-speed camera. Here, we show that the water entry of the horizontal hydrophobic cylinder forms a film of cavity behind the cylinder whereas a hydrophilic cylinder forms a cavity from both ends of the cylinder. In a high Froude number entry, once the cavity film ruptured on both sides of it, the contact lines of the cavity film abruptly move along the surface of the cylinder. In a low Froude number entry, the influence of weak fluid inertia force makes several ruptures on the cavity film which grow individually and split off the cavity. Of a particular interest is the fact that the multi-rupture regime appeals for the spanwise three-dimensionality on the cavity film against the previous studies within two-dimensional treatment. Furthermore, this report finds the trend for some range of Fr that the nondimensionalized closure depth of the cavity film z c with diameter of the cylinder obeys z c /d ∼ Fr 1/3 in the range 4.7 ≤ Fr ≤ 40 although it depends on Fr in the water-entry problem of a hydrophobic sphere.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Rupture of Cavity Film Due to Water Entry of Horizontal Superhydrophobic Circular Cylinders

Ueda¹,

Iguchi

2013

High Temperature Materials and Processes

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“…50 and 51 and CIP numerical results of Ref. 19 are compared with the results of present SPH method for the water-entry and freely rising cylinders. The left column of Fig.…”

Section: Numerical Code Accuracymentioning

confidence: 98%

“…1 and 2 have been obtained from Ref. 19. The snapshots are presented at the real times of 0.33 s and 0.42 s for the¯rst case and 0.5 s and 0.75 s for the second case.…”

Section: Numerical Code Accuracymentioning

confidence: 99%

Turbulent fluid-structure interaction of water-entry/exit of a rotating circular cylinder using SPH method

Ghazanfarian

Saghatchi

Gorji-Bandpy

2015

Int. J. Mod. Phys. C

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This paper studies the two-dimensional (2D) water-entry and exit of a rotating circular cylinder using the Sub-Particle Scale (SPS) turbulence model of a Lagrangian particle-based SmoothedParticle Hydrodynamics (SPH) method. The full Navier-Stokes (NS) equations along with the continuity have been solved as the governing equations of the problem. The accuracy of the numerical code is veri¯ed using the case of water-entry and exit of a nonrotating circular cylinder. The numerical simulations of water-entry and exit of the rotating circular cylinder are performed at Froude numbers of 2, 5, 8, and speci¯c gravities of 0.25, 0.5, 0.75, 1, 1.75, rotating at the dimensionless rates of 0, 0.25, 0.5, 0.75. The e®ect of governing parameters and vortex shedding behind the cylinder on the trajectory curves, velocity components in the°ow¯eld, and the deformation of free surface for both cases have been investigated in detail. It is seen that the rotation has a great e®ect on the curvature of the trajectory path and velocity components in water-entry and exit cases due to the interaction of imposed lift and drag forces with the inertia force.

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“…Comparison of results from adaptive resolution SPH (left), experiments(middle) and CIP (right)[24]. Penetration depth of cylinder in water.…”

mentioning

confidence: 99%

Adaptive resolution for multiphase smoothed particle hydrodynamics

Yang

Kong

2019

Computer Physics Communications

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The smoothed particle hydrodynamics (SPH) method has been increasingly used to study fluid problems in recent years; but its computational cost can be high if high resolution is required. In this study, an adaptive resolution method based on SPH is developed for multiphase flow simulation. The numerical SPH particles are refined or coarsened as needed, depending on the distance to the interface. In developing the criteria, reference particle spacing is defined for each particle, and it changes dynamically with the location of the interface. A variable smoothing length is used together with adaptive resolution.An improved algorithm for calculating the variable smoothing length is further developed to reduce numerical errors. The proposed adaptive resolution method is validated by five examples involving liquid drops impact on dry or wet surfaces, water entry of a cylinder and dam break flow, with the consideration of ambient gas. Different resolution levels are used in the simulations. Numerical validations have proven that the present adaptive resolution method can accurately capture the dynamics of liquid-gas interface with low computational costs. The present adaptive method can be incorporated into other SPHbased methods for efficient fluid dynamics simulation.

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Water Entry and Exit of a Horizontal Circular Cylinder

Cited by 74 publications

References 4 publications

Rupture of Cavity Film Due to Water Entry of Horizontal Superhydrophobic Circular Cylinders

Rupture of Cavity Film Due to Water Entry of Horizontal Superhydrophobic Circular Cylinders

Turbulent fluid-structure interaction of water-entry/exit of a rotating circular cylinder using SPH method

Adaptive resolution for multiphase smoothed particle hydrodynamics

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