Effect of viscosity on sloshing in a rectangular tank with intermediate liquid depth

The analysis of violent sloshing is of great interest for European aeroplane manufacturers. It has been widely reported that aircraft fuel sloshing significantly damps wing vibrations, but the complexity of the fluid-structure phenomena still demands further research. The aim of this work is to define an experimental methodology to quantify the sloshing force acting on a vertical Single Degree Of Freedom (SDOF) tank when the accelerations are similar to the ones found in a real wing. In this work, two different methodologies are presented for the calculation of the sloshing force involved in the SDOF tests, finding a very good level of agreement between them. A Froude scaled SDOF experiment has been devised for sloshing study, confirming first that the fluid presence increases the damping of the system notably, and second that the slosh-induced damping force is composed of an inertial term and a dissipative term. The sloshing force study also shows that this force is shifted with respect to position measurements, and this phase-shift is a key element in fluid-induced energy dissipation. A global energy study connecting the sources of energy dissipation with the forces involved in the dynamics of the system is performed, obtaining a quantitative contribution of the fluid's role in the system. Finally, a numerical model has been tested using the experimentally obtained sloshing forces as an input exhibiting good agreement with the previously obtained experimental results.

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“…Alternative studies, see Chang-Fang et al (2015) and Jin et al (2020), show how liquid viscosity affects the phase-shift in pressure impacts.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the liquid damping effects on a SDOF vertical sloshing tank

Martinez-Carrascal

González

2021

Journal of Fluids and Structures

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“…This type of impact is the reason for the repeatable measurements for all levels. 11,18 Figure 9 looks at the impact pressure as well as the duration of impact. This is also significant due to the structural rigidity.…”

Section: Wave Impact On Rigid Wallmentioning

confidence: 99%

“…They identified highly aerated and flip-through wave impacts as the most severe types of waves affecting offshore structures. By considering various viscous fluids, Jin 18 found viscosity to significantly contribute to the frequency response in sloshing tests.…”

Section: Introductionmentioning

confidence: 99%

Wave impact on a rigid and flexible wall using various viscous fluids during sloshing

Korkmaz

2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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This paper addresses a study of wave impacts on the chamfered shape of a structure during sloshing, using two different fluids through experimental analysis. Horizontal oscillations are carried out on the tank under various excitation frequencies at a fixed amplitude. Rigid and relatively flexible walls are considered for measuring pressure impact and structural deformation from the wave impacts. Various wave impulses are directed at the sidewall, and the structural deformations are discussed in detail. Wave impacts for various fluids are carried out, from which the pressure-time history, strain values, and free-surface deformation measurements are highlighted. Through the analysis, the breaking wave gets distorted by bottom chamfer at around the vertical portion of the wall. Therefore, physical results are changed likely to having with the wave strike the wall. The impact from more viscous fluids have also been found to reduce both the dynamic pressure and structural strain at practically the same rates in comparison with less viscous fluids.

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“…They also found that the rising time of the impact pressure in high viscosity liquid is longer than which in low viscosity liquid. Jin et al 11 experimentally studied the effect of liquid viscosity on the characteristics of sloshing and sloshing pressure in non-resonance state. When the viscosity of the liquid increased, the sloshing pressure peak value decreased and the sloshing gradually turned to a steady state due to the action of viscous dissipation.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of sloshing pressure distribution in a rectangular tank

Wang

Zou

Zhu

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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To clarify distribution characteristics of impact pressure induced by sloshing along the rectangular tank wall and predict the vertical position where the maximum pressure appears, this paper uses VOF method and dynamic mesh technique to simulate the sloshing in the rectangular tank and analyze the sloshing pressure under different conditions. The results show that the vertical position of the maximum sloshing pressure decreases with the increase of the impact strength when liquid does not impact the roof of the tank. The vertical position of the maximum sloshing pressure decreases with the increase of the excitation amplitude. The relationship between the vertical position of the maximum sloshing pressure and the excitation frequency presents parabola-like characteristics and the parabola opens up, which means the vertical position has the minimum value with the change of the excitation frequency, and the minimum of the vertical position occurs when the liquid in the tank near the resonance state. It also shows that the maximum sloshing pressure does not always appear at the static free surface corresponding to different filling levels. Instead, it is distributed regionally as the filling level changes.

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Effect of viscosity on sloshing in a rectangular tank with intermediate liquid depth

Cited by 21 publications

References 25 publications

Experimental study of the liquid damping effects on a SDOF vertical sloshing tank

Experimental study of the liquid damping effects on a SDOF vertical sloshing tank

Wave impact on a rigid and flexible wall using various viscous fluids during sloshing

Numerical investigation of sloshing pressure distribution in a rectangular tank

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