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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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Proceedings ArticleDOI
08 Jun 2014
TL;DR: In this article, a numerical wave flume based on finite volume solution of the Navier-Stokes equations to account for viscous dissipation is employed for the resonant behavior of the fluid trapped in the narrow gap between a floating LNG and an LNG carrier.
Abstract: The resonant behavior of the fluid trapped in the narrow gap between a floating LNG and an LNG carrier in a side-by-side offloading operation is investigated in this study employing a numerical wave flume. The wave flume is based on the finite volume solution of the Navier-Stokes equations to account for the viscous dissipation. The waveFoam toolbox, a modified version of the standard OpenFOAM multiphase flow solver interFoam developed by Jacobson et al (2011) has been used for the purpose of wave generation and relaxation inside the computational domain. This method has a quite high efficiency as it takes advantage of the potential flow theory for wave generation purpose and the viscous flow theory for inside the wave tank, respectively. The volume of fluid (VOF) method first introduced by Hirt and Nichols (1981) is used to capture the free surface oscillations at the air and water interface. Water waves are generated at a reasonable distance from the inlet boundary and two rectangular relaxation zones at the inlet and outlet boundaries of the domain have been implemented to suppress wave reflection at the outer boundaries as well as waves reflected internally in the computational domain. The influence of incident wave frequency on resonance wave height and frequency is examined. Numerical results of free surface evolution at different incident wave frequency seem to agree well with the experimental results of Saitoh et al (2006) and numerical results of Lu et al (2008). In order to justify the effect of bilge keels on flow separation at the bottom corner of the ship, four different corner configurations have been investigated and compared to the base sharp edged case. It is observed that the magnitude of the free surface elevation at the resonance frequency increases significantly by about 10 times the incoming wave height while the peak of resonant frequency curves shifts to higher frequencies in the higher curvature modes compared with the base case.© 2014 ASME

1 citations

Journal ArticleDOI
TL;DR: In this article , a Smoothed Particle Hydrodynamics (SPH) framework was used to model the interaction between waves and thin, upright porous barriers, and the results indicated that for each barrier, irrespective of the properties of the wave interacting with it, there is a coefficient value that is able to account adequately for the energy dissipation by the barrier.

1 citations

15 Dec 2010
TL;DR: In this paper, the successive water levels within compartments of an upright perforated wave absorber were evaluated on the basis of the continuity equation and the Bernoulli equation in the steady form.
Abstract: On the basis of the continuity equation and the Bernoulli equation in the steady form, a differential equation is developed to evaluate the successive water levels within compartments of an upright perforated wave absorber. Then the initial and boundary conditions are introduced and the differential equation is solved as an initial value problem. Finally the reflection coefficient from the wave absorber is calculated by establishing a balance bet ween the rates of energy dissipated, the energy propagation and the energy reflected of the incident waves. The results of numerical model are verified by experimental tests with regular waves. A new non-dimensional parameter is introduced to characterise the hydraulic performance of the upright perforated wave absorber. It is shown that the rate of wave dissipation through the absorber decreases as this parameter increases.

1 citations

Dissertation
01 Jan 2018
TL;DR: In this paper, van der Zanden et al. investigated the difference between simulated transport rates using a single-fraction approach and multifraction approach, and comparing these rates to wave flume data.
Abstract: It is important that the development of the coastline is constantly monitored, and that the effects of interventions, such as nourishments, can be accurately predicted by morphological models. A widely used morphodynamic model by coastal engineers is DELFT3D (Lesser et al., 2004). Both the coastline and these nourishments contain sand with varying grain sizes (mixed sediment). Hence the model of DELFT3D needs to work with these mixed sediments to determine the evolution of the long-term morphodynamics of the beach profile. The objective of this thesis is to investigate the difference between modelled transport rates using a single-fraction approach and multi-fraction approach, and comparing these rates to wave flume data (Van der Zanden et al., 2017). This is done with DELFT3D, using formulations for bed-load transport by Van Rijn (2007c). First, two stand-alone MATLAB models for bed-load transport were used to compare the results of a single-fraction approach and multi-fraction approach to a database containing data from graded sediment transport experiments in oscillatory flow tunnels (Van der Werf et al., 2009). The bed-load transport models that were used were the bed-load transport formulations by Van Rijn (2007c) and the SANTOSS model (Van der A et al., 2013). The Van Rijn model gave comparable results for both the single-fraction and multi-fraction approach, giving only slightly better results for the multi-fraction approach. For the SANTOSS model, the multi-fraction approach evidently gave a better approximation of the measured bed-load transport rates. Additionally, the SANTOSS model gave the best results when compared to the database Before any analysis of the transport rates using DELFT3D took place, the hydrodynamics were recalibrated. Previously, Schnitzler (2015) already modified formulations in DELFT3D to obtain better results for regular breaking waves. Since the data were not processed till after these modifications, recalibration was required. Generally, DELFT3D replicated the wave height and undertow velocities accurately, with exception of the undertow velocities at two of the twelve locations. At these two locations the measurements were underestimated. Subsequently, DELFT3D was used to model both bed-load and suspended-load using a single-fraction and multi-fraction approach. When modelling the current-related suspended sediment transport and bed-load transport, little difference was noticed between the two approaches. The wave-related and total transport rates did show differences between the two approaches, where the single-fraction gave wave-related suspended sediment transport rates 3 times larger than the multi-fraction approach. It has not yet been discovered whether these differences can be attributed to grading effects or an error in DELFT3D. Based on the results of the bed-load transport rates and current-related suspended sediment transport rates, it does not really seem important whether a single-fraction or multi-fraction approach is used. The logical follow-up step would be to implement the SANTOSS bed-load transport formulations in DELFT3D, as this bed-load transport model showed larger differences between the single-fraction and multi-fraction approach.

1 citations

Journal ArticleDOI
TL;DR: Wang et al. as discussed by the authors established a 2D numerical wave flume based on the VOF method and k- model to numerically simulate the interaction of wave with perforated plates.
Abstract: 2D numerical wave flume is established based on the VOF method and k- model to numerically simulate the interaction of wave with perforated plates. The internal source generation of wave is applied in making wave area whose end is placed the sponge layer to absorb the reflection of wave. The numerical results of reflection coefficient before perforated plate are compared with the experimental results of reference (Liu, 2008) to verify the numerical method. By changing porosity, the effect of porosity on reflection coefficient can be analyzed. Moreover, the pressure difference between the outer and inner of perforated plate was studied, and then the mutual influence of porosity on the pressure difference is obtained according to the substantive numerical results.

1 citations


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