Validation of a hydrodynamic model for a curved, multi-paddle wave tank

Gyöngy, István; Richon, Jean Baptiste; Bruce, Tom; Bryden, Ian

doi:10.1016/j.apor.2013.11.002

Cited by 7 publications

(2 citation statements)

References 26 publications

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“…This set-up is comparable to the taped underwater markers offered by Qualisys, but much lighter, water resistant and buoyant. A preliminary feasibility study showed that such a marker ball can be tracked by the Qualisys system whilst afloat on the surface and subject to wave motions in the University of Edinburgh's Curved Wave Tank [57] and in the FloWave basin, which has a diameter of 25 m and is also located at the University of Edinburgh [58][59][60][61][62][63]. For the experiments, 12 marker balls are added to the water in the circular tank ( Figure 1).…”

Section: Floating Infra-red Reflective Markersmentioning

confidence: 99%

Capturing the Motion of the Free Surface of a Fluid Stored within a Floating Structure

Gabl

Steynor

Forehand

et al. 2018

Water

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Large floating structures, such as liquefied natural gas (LNG) ships, are subject to both internal and external fluid forces. The internal fluid forces may also be detrimental to a vessel’s stability and cause excessive loading regimes when sloshing occurs. Whilst it is relatively easy to measure the motion of external free surface with conventional measurement techniques, the sloshing of the internal free surface is more difficult to capture. The location of the internal free surface is normally extrapolated from measuring the pressure acting on the internal walls of the vessel. In order to understand better the loading mechanisms of sloshing internal fluids, a method of capturing the transient inner free surface motion with negligible affect on the response of the fluid or structure is required. In this paper two methods will be demonstrated for this purpose. The first approach uses resistive wave gauges made of copper tape to quantify the water run-up height on the walls of the structure. The second approach extends the conventional use of optical motion tracking to report the position of randomly distributed free floating markers on the internal water surface. The methods simultaneously report the position of the internal free surface with good agreement under static conditions, with absolute variation in the measured water level of around 4 mm. This new combined approach provides a map of the free surface elevation under transient conditions. The experimental error is shown to be acceptable (low mm-range), proving that these experimental techniques are robust free surface tracking methods in a range of situations.

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Section: Floating Infra-red Reflective Markersmentioning

confidence: 99%

Capturing the Motion of the Free Surface of a Fluid Stored within a Floating Structure

Gabl

Steynor

Forehand

et al. 2018

Water

Self Cite

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“…Ohkusu [3] and Kashiwagi [4] proposed a method for indirect estimation of the longitudinal profiles of the radiation and scattering waves generated by a ship model when moving at a constant speed using a single-point wave gauge or an array of such wave gauges aligned longitudinally in a tank. In addition, spatial wave profiles can be obtained by using multiple conventional single-point wave gauges and repeating the measurements after changing the positions of the wave gauges [9][10][11], but this method is very time-consuming. It is thus desirable to be able to measure the spatial wave profiles directly.…”

Section: Introductionmentioning

confidence: 99%

Stereo Reconstruction Method for 3D Surface Wave Fields around a Floating Body Using a Marker Net in a Wave Tank

Higuchi,

Houtani,

Gonçalves

et al. 2023

JMSE

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Spatial wave fields around floating bodies are important for the understanding of hydrodynamics, and particularly the wave drift forces, of floating bodies in waves; however, experimental measurement of these fields is challenging. This paper presents a stereo reconstruction method for three-dimensional (3D) surface wave fields around floating bodies in a wave tank. Styrofoam markers were attached to a flexible net in a regular grid, called a marker net, and were placed on the water surface to be used as targets for stereo cameras (SCs). A thin plate spline was applied to the markers detected by the SCs to reconstruct the 3D surface wave profile around a floating body model. The proposed method was validated by measuring the wave field around a cylindrical floating body with a footing at its bottom. These experiments were conducted under regular wave incidence conditions. A wave elevation time series measured using a servo-controlled wave gauge was used as the benchmark data. The 3D surface wave field reconstruction method was applied under three different conditions: without the model, with a fixed model, and with a freely oscillating model. The results showed reliable reconstructions of the scattering and radiation waves. The marker net’s effects on the floating body’s motion and the surrounding wave fields were shown to be negligible by comparing the results acquired with and without the marker net.

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