CFD-based numerical study on drag reduction of ventilated supercavities combined with gas layer of the surface vehicle with struts

An, Honglei; Pan, Haozhe; Yang, Po

doi:10.1016/j.oceaneng.2022.112334

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…The numerical simulations were carried out using the commercial CFD code STAR-CCM+ 13.06, which is based on the finite volume method. To obtain the free surface and the ventilated cavity, the continuity equation and the momentum equation were employed [41]:…”

Section: Governing Equationsmentioning

confidence: 99%

Numerical Investigation on the Ventilated Supercavity around a Body under Free Surface Effect

Zhi

Jin

Huang

et al. 2023

JMSE

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Reducing vessel resistance by using ventilated cavities has been a highly researched topic in the marine industry. There is limited literature on ventilated supercavities near the free surface, which indicates that their dynamic behavior is more complex than conventional ventilated cavities due to the effect of the free surface. This paper employs numerical simulations to study the dynamic behavior of the ventilated supercavity, taking into account the effect of the free surface. Numerical simulations can predict gas leakage behaviors, cavity geometry, and internal flow structures. The influence of the free surface shortens the length of the ventilated cavity and increases the diameter. The presence of the free surface mainly changes the vertical velocity distribution between the free surface and the cavity. The results show that there are two typical gas leakage mechanisms under different immersion depths: twin-vortex tube leakage mode and re-entrant jet leakage mode. The internal flow field of ventilated supercavity is classified into three regions: the internal boundary layer, the ventilation influence region, and the reverse flow region. As the distance between the free surface and the ventilated supercavity decreases, the ventilated supercavity is affected by both the free surface effect and the gravity effect.

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Section: Governing Equationsmentioning

confidence: 99%

Numerical Investigation on the Ventilated Supercavity around a Body under Free Surface Effect

Zhi

Jin

Huang

et al. 2023

JMSE

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show abstract

Research on the encounter motion of super-cavitating vehicles

Zhou,

Fan,

Tian

et al. 2023

Journal of Applied Physics

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In this paper, the super-cavitating phenomenon under the effect of two vehicles’ encounter motion processes is numerically studied. Particular attention is given to the influence of the vertical gaps between the vehicle, the cavitation number, and the slenderness ratio on the cavity profile and radial force of the object. Several numerical models are built to study the cavity evolution process and the force acting on the vehicle to explore the influence mechanism of two vehicles’ encounter motion on supercavitating flow. The study shows that the cavity around the vehicle is primarily affected by the vertical gaps and cavitation number, but is relatively weakly affected by the slenderness ratio. Several impact laws are acquired in the paper. The relationship between cavity fracture time and vertical gaps is approximately a power function and obeys the law of t = 5.433h0.3688. The concept of the time of the maximum radial force occurrence and the cavitation number follows the formula of t = 4.86e0.3688σ. The relationship between the maximum radial force occurrence position and the cavitation number is a function of Ln and consistent with the law n = −0.799ln(σ) + 8.427.

show abstract

CFD-based numerical study on drag reduction of ventilated supercavities combined with gas layer of the surface vehicle with struts

Cited by 2 publications

References 17 publications

Numerical Investigation on the Ventilated Supercavity around a Body under Free Surface Effect

Numerical Investigation on the Ventilated Supercavity around a Body under Free Surface Effect

Research on the encounter motion of super-cavitating vehicles

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