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Wave flume

About: Wave flume is a research topic. Over the lifetime, 1627 publications have been published within this topic receiving 23335 citations.


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TL;DR: In this paper, the authors investigated the interaction of surface gravity waves with horizontal pitching plate for actively controlling waves based on the linearized theory of water waves and derived the numerical results for the reflection coefficient, transmission coefficient and free surface deflection.
Abstract: The interaction of surface gravity waves with horizontal pitching plate for actively control waves is investigated based on the linearized theory of water waves. The two dimensional problem is formulated for the submerged plate pitching about its middle point and the other plate is considered to be floating above the submerged plate. The submerged plate’s thickness is considered negligible in comparison with the water depth and wavelength of the incident wave. The study is carried out using the matched eigenfunction expansion method and the analytical solution is developed for the interaction of the surface gravity waves with horizontal submerged structure. The numerical results for the reflection coefficient, transmission coefficient and free surface deflection are computed and analyzed. The study is carried to find the optimal value of the length and depth of the submerged plate at which the dissipation of the incident wave energy is observed. The reduction the wave transformation due to the pitching of the plate with the change in angle of incidence is also analyzed. The present study will be helpful in the analysis of proper functioning of submerged pitching plate to control wave motion for the protection of offshore structures.Copyright © 2015 by ASME

5 citations

Journal ArticleDOI
TL;DR: In this article, a two-dimensional numerical wave flume based on OpenFOAM package with Re-Normalization Group (RNG) turbulent model was employed to examine the influence of heaving frequency and amplitude with various moonpool configurations on fluid resonant behavior.
Abstract: Fluid resonance in a moonpool formed by two identical rectangular hulls during in-phase heaving motion is investigated by employing a two-dimensional numerical wave flume based on OpenFOAM package with Re-Normalization Group (RNG) turbulent model. The focus of the study is to examine the influence of heaving frequency and amplitude with various moonpool configurations on fluid resonant behavior. It is found that the resonant frequency of wave response in moonpool tends to decrease with the increase of moonpool breadth and hulls draft. The decrease of resonant amplitude can be observed for large moonpool breadth. The influence of hulls draft on resonant amplitude is not remarkable, especially for large heaving amplitude. The increase in heaving amplitude results in the decrease of relative resonant amplitude in an approximate power function, implying a complicated dependence of the resonant amplitude on heaving amplitude. Flow patterns in the vicinity of the moonpool are also analyzed, mainly regarding the dependence on the heaving frequency. The negligible influence of vortices on the wave response in moonpool is expected for low-frequency excitation because it is hard to observe the vortex structures. Intensive vortical flow and vortex structure can be identified under resonant condition, which gives rise to significant dissipation and accounts for the smaller relative resonant amplitude in moonpool. As for high-frequency excitation, the vortex motion is rather weak and dissipates rapidly, leading to insignificant effect on wave response amplitude.

5 citations

Journal ArticleDOI
30 Oct 2014
TL;DR: In this paper, a semi-automated methodology for measuring velocity and thickness of up-rushing water jets with high velocities has been proposed, which can be applied on cases considering waves ranging from non-breaking to nearly and strongly breaking.
Abstract: Waves breaking on vertical seawalls result in up-rushing water jets with high velocities, which in turn lead to large overtopping rates and pose a serious threat to pedestrians, vehicles or any infrastructure in the vicinity of the seawall. Nevertheless, knowledge on the characteristics, namely the velocity and thickness, of such jets is scarce. Based upon recent experiments in the Large Wave Flume (Groser Wellenkanal, GWK) of Forschungszentrum Kuste (FZK) the current paper proposes a semi-automated methodology for measuring velocity and thickness of up-rushing jets. The methodology was applied on cases considering waves ranging from non-breaking to nearly and strongly breaking and yielded encouraging results. With regards to the velocities a good repeatability is reported for non-breaking waves, while for breaking waves velocities are, as anticipated, observed to depend on the intensity of breaking. When the thickness is concerned, user based decisions are required as the selection process is drastically affected by the increased air content of the up-rushing jet.

5 citations

Journal ArticleDOI
TL;DR: In this paper, the hydrodynamic performance of a box-floating breakwater in different terrains is performed in a 2D wave flume under regular wave actions and irregular wave actions, respectively.
Abstract: An experimental investigation on the hydrodynamic performance of a box-floating breakwater in different terrains is performed in a 2D wave flume under regular wave actions and irregular wave actions, respectively. The wave transmission coefficients, motion responses and mooring forces are focused to validate the hydrodynamic performance of the box-floating breakwater. The performance of the box-floating breakwater in flat terrain is also experimentally investigated for comparison. The influences of the terrain width and quantity on the hydrodynamic behaviors of the box-floating breakwater are discussed and analyzed. The results indicate that the box-floating breakwater in different terrains has a better wave attenuating ability than the box-floating breakwater in flat terrain due to wave energy loss caused by the interaction between the breakwater and terrain. However, the width of terrain has a limited effect on the hydrodynamic performance of the floating breakwater. For double terrains, the wave attenuation performance of the box-type floating breakwater increases with the decrease of the spacing between double terrains, especially for long-period waves. It is also found that terrain has significant influences on the roll and heave motions, while terrain hardly affects the sway motions. In addition, terrain plays an important role in the mooring forces, while the width and quantity of terrain weakly affect the mooring forces of box-floating breakwater. To investigate the hydrodynamic performance of rectangular floating breakwater in different terrains systematically, Smoothed Particle Hydrodynamics (SPH) methods is used. It can be concluded that the results of SPH show a good agreement with the experimental results.

5 citations

Journal ArticleDOI
TL;DR: In this article, the reliability of an innovative non-toxic colloidal silica-based solution for coastal sand dunes has been verified for the first time by means of laboratory experiments.
Abstract: Dune recovery interventions that integrate natural, sustainable, and soft solutions have become increasingly popular in coastal communities. In the present study, the reliability of an innovative non-toxic colloidal silica-based solution for coastal sand dunes has been verified for the first time by means of laboratory experiments. An extensive experimental campaign aimed at studying the effectiveness of the use of nanosilica has been conducted in the 2D wave flume of the EUMER laboratory at the University of Salento (Italy). The study was first based on a horizontal seabed and then a cross-shore beach-dune profile was drawn similar to those generally observed in nature. Detailed measurements of wave characteristics and observed bed and cross-shore beach-dune profiles were analyzed for a wide range of wave conditions. In both cases, two sets of experiments were carried out. After the first set of experiments performed resembling the native conditions of the models composed with natural sand, the effects of the injection of the mineral colloidal silica-based grout were investigated. The observations show that mineral colloidal silica increases the mechanical strength of non-cohesive sediments reducing the volume of dune erosion, thus improving the resistance and longevity of the beach-dune system.

5 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202331
202284
202165
202069
201964
201859