Numerical investigations of wave loads on fixed box in front of vertical wall with a narrow gap under wave actions

Gao, Junliang; He, Z. X.; Zang, Jun; Chen, Qiang; Ding, Haoyu; Wang, Gang

doi:10.1016/j.oceaneng.2020.107323

Cited by 46 publications

(21 citation statements)

References 36 publications

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“…The results indicated the ratios of the second-order components of the free-surface elevation in the gap and the moments on boxes to the corresponding first-order ones around the resonant frequency are normally larger than those at the frequencies far from the resonant frequency. Later, the wave loads during gap resonance between a fixed box and a vertical wall were also studied by Gao et al [23], revealing the maximum horizontal wave force, the maximum vertical wave force, and the maximum moment appear to decrease with the increase of topographical slope overall.…”

Section: Introductionmentioning

confidence: 97%

Effects of narrow gap wave resonance on a dual-floater WEC-breakwater hybrid system

et al. 2021

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Section: Introductionmentioning

confidence: 97%

Effects of narrow gap wave resonance on a dual-floater WEC-breakwater hybrid system

et al. 2021

Self Cite

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“…1–3 During the wave breaking process, the motion of wave surface dynamically coupled with the air involvement, which formed a gas-liquid mixture and the gas content was large. 4–6 When the jet hit the water, air was sucked into water. 7–9 In other words, under the action of wave breaking, bow wave and jet, bubbles were formed in water.…”

Section: Introductionmentioning

confidence: 99%

Reducing bubble generation and sweepdown effect on a research vessel with a moonpool

Yao

Huang

Shi

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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Some research vessels set moonpools for sonars installation. The moonpool provides a relatively good working environment for sonar in a harsh marine environment. At the same time, other acoustic detection equipment are installed along the ship bottom behind the moonpool. Due to the exist of the sonar with a variable cross-section, the number of bubbles generated in the moonpool increases. The bubbles generated in the moonpool expel and flow along the vessel bottom to the stern, which leads to the sweepdown effect. The performance of the sonar and other acoustic detection equipment degrades by the bubbles around. However, the research on reducing bubble generation in the moonpool and sweepdown effects is rare. So in present paper the reduction effects of damping devices such as the flange and choke deck on the bubble generation in the moonpool are investigated experimentally. Then, in order to reduce the sweepdown effects of bubbles on the ship bottom, three other damping devices which are double flaps, diversion channel and wedge are investigated. It can be seen that through reducing the area of bubble leakage in the moonpool the distribution position of bubbles can be effectively restricted and the width and thickness of the bubbles reduce.

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“…Lu et al (2020) established a 2-D numerical model from the OpenFOAM ® and researched the free surface resonance in a gap between a floating box structure and a fixed wall [28]. Various hydrodynamic problems in ocean engineering have further been investigated by many scholars based on the CFD with OpenFOAM ® (e.g., Gao et al (2019bGao et al ( , 2019cGao et al ( , 2020); Zhuang and Wan (2019); Chen (2019b); Liu et al (2019); Chen and Zou (2019)) [29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Study of Liquid Viscosity Effects on Hydrodynamic Forces on an Oscillating Circular Cylinder Underwater Using OpenFOAM®

Mao

et al. 2021

Symmetry

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By neglecting the viscosity of fluid and rotation in flow, the theory of potential flow cannot accurately predict the hydrodynamic forces on the structures under significant viscous effects. In this study, the effects of liquid viscosity on the hydrodynamic forces on a horizontal circular cylinder underwater with a large-amplitude forced oscillation were investigated. The study used a two-dimensional two-phase flow wave tank model based on the viscous fluid theory using the OpenFOAM® package. The numerical calculations were carried out under different types of liquid (i.e., liquid with different viscosities). The liquid viscosity effects are visually shown by comparison of the various frequency components of the hydrodynamic forces on the cylinder, and the magnitude and phase relations of the viscous shear forces and the pressure forces. By analyzing the distribution characteristics of the flow fields around the circular cylinder, the viscous-effect mechanisms are revealed. It is found that the discrepancies of the contributions of viscous shear forces, and the discrepancies of the vortex effects on the phase and magnitude of the pressure forces lead to the obvious differences among the results under different liquid viscosities.

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Numerical investigations of wave loads on fixed box in front of vertical wall with a narrow gap under wave actions

Cited by 46 publications

References 36 publications

Effects of narrow gap wave resonance on a dual-floater WEC-breakwater hybrid system

Effects of narrow gap wave resonance on a dual-floater WEC-breakwater hybrid system

Reducing bubble generation and sweepdown effect on a research vessel with a moonpool

Study of Liquid Viscosity Effects on Hydrodynamic Forces on an Oscillating Circular Cylinder Underwater Using OpenFOAM®

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