Numerical flow models to simulate tuned liquid dampers (TLD) with slat screens

Tait, Michael J.; Damatty, Ashraf A. El; Isyumov, N.; Siddique, Mizanur R.

doi:10.1016/j.jfluidstructs.2005.04.004

Cited by 124 publications

(71 citation statements)

References 13 publications

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“…This suppression of free-surface waves is significant because smaller free-surface elevations at the side walls mean smaller stresses on the vessel, and hence are less likely to lead to damage, in the case of a prescribed horizontal forcing. This suppression of the free-surface waves is similar to that already seen in TLDs in the works of Tait and co-workers who use surface piercing damping screens (essentially surface piercing porous baffles) to damp the free-surface waves (Tait et al, 2005;Cassolato et al, 2011).…”

Section: Conclusion and Discussionsupporting

confidence: 76%

Liquid sloshing in a horizontally forced vessel with bottom topography

Turner

2016

Journal of Fluids and Structures

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Section: Conclusion and Discussionsupporting

confidence: 76%

Liquid sloshing in a horizontally forced vessel with bottom topography

Turner

2016

Journal of Fluids and Structures

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“…We nondimensionalise the governing equations according to (14) and (15). We then substitute the decompositions (17) and (18) into (1)- (4), (9), and (11), which yields the following equations:…”

Section: Semi-analytical Solutionmentioning

confidence: 99%

“…Typically, such screens are used to damp out the sloshing motion in wave tanks or to act as tuned liquid dampers in order to absorb unwanted vibrations [14]. Numerous models have been put forward for this pressure loss law, which assume that the pressure loss is a function of the local flow velocity as in [13] above.…”

Section: Introductionmentioning

confidence: 99%

A new model of viscous dissipation for an oscillating wave surge converter

Cummins

Dias

2016

J Eng Math

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General rightsCopyright for the publications made accessible via the Edinburgh Research Explorer is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Take down policyThe University of Edinburgh has made every reasonable effort to ensure that Edinburgh Research Explorer content complies with UK legislation. If you believe that the public display of this file breaches copyright please contact openaccess@ed.ac.uk providing details, and we will remove access to the work immediately and investigate your claim. A mathematical model of an oscillating wave surge converter is developed to study the effect that viscous dissipation has on the behaviour of the device. Recent theoretical and experimental testing have suggested that the standard treatment of viscous drag (e.g., Morison's equation) may not be suitable when the effects of diffraction dominate the wave torque on the device. In this paper, a new model of viscous dissipation is presented and explored within the framework of linear potential flow theory, and application of Green's theorem yields a hypersingular integral equation for the velocity potential in the fluid domain. The hydrodynamic coefficients in the device's equation of motion are then calculated, and used to examine the effect of dissipation on the device's performance. A Haskind relationship, expressing the link between the scattering-and radiation-potential problems is derived, and its connection to existing Haskind relations is explored. A sensitivity study of the device's power capture to the magnitude of the dissipation present in the system is carried out for a selection of device widths. The results of the sensitivity study are explained with reference to existing experimental and numerical data. A special focus is given to the effects of dissipation on the performance of a device whose pitching motion is tuned to resonate with the incoming waves.Response to Reviewers: In order to get the bibliography into the right format for the journal, we needed to create a new .bst file (spbasic-unsrt.bst), so please note this when compiling/proofing. Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporation

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“…4.4]). Other hydrodynamic-screen applications are associated with anti-rolling tanks of ships, tuned liquid dampers (TLD) of tall buildings, swash bulkheads of ships, and perforated plates of oil-gas separators on a floating platform (see for instance [2][3][4][5]). A design requirement for anti-rolling tanks and TLDs is that the lowest natural sloshing frequency should not be significantly affected by the screen and approximately equal to the roll natural frequency and the lowest important structural natural frequency, respectively.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling of liquid sloshing in a two-dimensional rectangular tank with a slat screen

2010

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Potential-flow theory is employed with linear free-surface conditions, multimodal method, and a screenaveraged pressure-drop condition to derive an analytical modal model describing the two-dimensional resonant liquid motions in a rectangular tank with a vertical slat-type screen in the tank middle. The tank is horizontally excited in a frequency range covering the two lowest natural sloshing frequencies. The model consists of a system of linear ordinary differential [modal] equations responsible for liquid sloshing in compartments, as well as a nonlinear ordinary differential equation describing the liquid flow between the compartments. New experimental model tests on steady-state wave elevations near the tank wall are reported for the solidity ratios 0.328 ≤ Sn ≤ 0.963 where Sn is the ratio between the solid area and the full area of the screen. The experiments generally support the applicability of the model. The discrepancy can be explained by the free-surface nonlinearity. The screen acts as a damping mechanism for low and intermediate solidity ratios, but it causes an increase in the lowest resonant sloshing frequency at higher solidity ratios as if the screen had been replaced by an unperforated wall.

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Numerical flow models to simulate tuned liquid dampers (TLD) with slat screens

Cited by 124 publications

References 13 publications

Liquid sloshing in a horizontally forced vessel with bottom topography

Liquid sloshing in a horizontally forced vessel with bottom topography

A new model of viscous dissipation for an oscillating wave surge converter

Analytical modeling of liquid sloshing in a two-dimensional rectangular tank with a slat screen

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