Viscosity and nonlinearity effects on the forces and waves generated by a floating twin hull under heave oscillation

Ananthakrishnan, P.

doi:10.1016/j.apor.2015.03.002

Cited by 13 publications

(6 citation statements)

References 26 publications

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“…The influence of viscosity and nonlinearity on the forces and waves generated by a floating twin hulls under heave oscillations was investigated by Ref. [1]. Numerical simulations showed that the nonlinear effect on the wave forces is important for the large amplitude oscillation, while the viscous effect on wave forces is also significant due to flow separation [17].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of wave forces on two side-by-side non-identical boxes in close proximity under wave actions

et al. 2019

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Wave forces on two side-by-side non-identical boxes in close proximity under wave actions are investigated by employing a numerical wave flume based on the OpenFOAM ® package. The similarity and discrepancy of hydrodynamic behavior between the wave response in the narrow gap and the wave forces on the boxes are the focus of the present study. Around resonant frequencies, the large-amplitude piston-type free surface oscillation in the narrow gap can lead to the peak values in the horizontal and vertical wave forces on the downstream box, and the horizontal wave forces on the upstream box. However, only a rapid decrease with the incident wave frequencies can be observed for the vertical wave forces on the upstream box. The resonant frequencies of the wave forces on two boxes are also different with those of wave response in the narrow gap. With the increase of incident wave amplitude, the resonant frequencies and normalized amplitudes of wave forces on downstream box tend to be smaller, which is similar with that of wave response in the narrow gap. However, the normalized wave forces on the upstream box around resonant frequencies do not always decrease with the increase of incident wave amplitude. On the whole, the hydrodynamic behavior of wave forces has some similar characteristics with that of wave response in the narrow gap. However, evident discrepancy between them can also be observed because the other factors, such as the wave response upstream and downstream the two-box systems, also has the non-negligible contribution to wave forces.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of wave forces on two side-by-side non-identical boxes in close proximity under wave actions

et al. 2019

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“…The lateral piston mode and longitudinal sloshing mode were successfully captured in their work, however, the free surface nonlinearity was found to play a minor role in reducing the exaggerated fluid resonance. Ananthakrishnan (2015) examined the influence of fluid viscosity and free surface nonlinearity on the waves and forces induced by floating twin hulls with heaving oscillations. Numerical results showed that the nonlinear effect on the wave forces is important for the large-amplitude oscillation relative to the hull draft.…”

Section: Introductionmentioning

confidence: 99%

Higher-order harmonic induced wave resonance for two side-by-side boxes in close proximity

2021

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“…As for the field of aerospace, Mingle et al (Deng et al , 2019) researched the sloshing behaviors in the fuel storage tanks of spacecraft, and Konopka et al (2019) adopted a control algorithm to solve the relevant problems in rocket operation. What is more, Ananthakrishnan (2015) analyzed the nonlinear fluid dynamics of a double rectangular hull subjected to the external vibration and obtained the 2D nonlinear time-domain solutions for viscous and inviscid problems. It was found that the fluid viscosity has few influences on the hydrodynamic pressure and the wave height in liquid sloshing when the frequency of external incentives is too large or non-resonant regular frequency.…”

Section: Introductionmentioning

confidence: 99%

Finite element method for analyzing effects of porous baffle on liquid sloshing in the two-dimensional tanks

Gao

Yin

et al. 2020

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Purpose The purpose of this paper is to analyze the liquid sloshing behaviors in two-dimensional tanks with various porous baffles under the external excitation. Design/methodology/approach Adopting the finite element method (FEM) and control variable method to study the impacts of the height, length, number, location, shape, porous-effect parameter of the porous baffle, the external load frequency and the shape of the tank on the liquid sloshing response. Findings The amplitude of the free surface can be reduced effectively when the baffle opening is appropriate. The anti-sway ability of the system increases in pace with the baffle’s height growing. Under the same conditions, the shapes of the baffles have an important effect on improving the anti-sway ability of the system. Originality/value As there exist the differences of the velocity potential between each side of the porous baffle, which means that there are two different velocity potentials at a point on the porous baffle, the conventional finite element modeling technologies are not suitable to be applied here. To deal with this problem, the points on the porous baffle are regarded as two nodes with the same coordinate to model and calculate.

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Viscosity and nonlinearity effects on the forces and waves generated by a floating twin hull under heave oscillation

Cited by 13 publications

References 26 publications

Numerical investigation of wave forces on two side-by-side non-identical boxes in close proximity under wave actions

Numerical investigation of wave forces on two side-by-side non-identical boxes in close proximity under wave actions

Higher-order harmonic induced wave resonance for two side-by-side boxes in close proximity

Finite element method for analyzing effects of porous baffle on liquid sloshing in the two-dimensional tanks

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