Topic
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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01 Jan 2015
TL;DR: Based on large eddy simulation of turbulent f lows in wave boundary layer, a modified method was proposed to calculate sediment transport rate under non-harmonic waves as mentioned in this paper, which was further used to explore the influences of flow acceleration and the phase lead between the free stream velocity and bed shear stress on sediment transport ratio in different phases of one wave cycle for forth-leaning.
Abstract: Sediment transport under waves is one of the key dynamic processes o f coastal sediment motion. Previous studies for this issue are mainly based on linear wave theory and quasi-steady simplification. However, waves in real circumstance are always irreg ular, generally with a certain degree of asymmetry and/or velocity-leaning especially in shallow water. It is envisaged that s ediment movement under non-harmonic waves is different from sinusoidal waves. Based on large eddy simulation of turbulent f lows in wave boundary layer, a modified method is proposed to calculate sediment transport rate under non-harmonic waves. It is f urther used to explore the influences of flow acceleration and the phase lead between the free stream velocity and bed shear stress on sediment transport rate in different phases of one wave cycle for forth-leaning. The net transport rate is found to in crease with the degree of asymmetry and velocity-leaning index. Both the acceleration and the phase lead have a great in fluence on average transport rate in each phase. © 2015 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of The Chinese Society of Theoretical and Applied Mechanics (CSTAM).
1 citations
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TL;DR: In this article, a two-component theory for weakly modulated weakly nonlinear waves is proposed, which exhibits the best performance among the considered models, and the efficiency of different models for reconstruction the pressure field from the known surface displacement time series is investigated.
Abstract: The data of simultaneous measurements of the surface displacement produced by propagating planar waves in experimental flume and of the dynamic pressure beneath the waves are compared with the theoretical predictions based on different approximations for modulated potential gravity waves. Regular and irregular wave sequences in intermediate depths are considered. The efficiency of different models for reconstruction the pressure field from the known surface displacement time series (the direct problem) is investigated. A new two-component theory for weakly modulated weakly nonlinear waves is proposed, which exhibits the best performance among the considered. Peculiarities of the vertical mode of the pressure second harmonic are discussed.
1 citations
TL;DR: In this article , the wave attenuation caused by the pile structure is investigated using a numerical model, namely the SWASH model, which allows for simulating non-hydrostatic phenomena in coastal waters as driven by waves.
Abstract: Pile breakwater is an artificial coastal structure consisting of closely spaced piles. Its benefits are similar to other coastal structures by attenuating the energy of the incoming wave. In this paper, the wave attenuation caused by the pile structure is investigated using a numerical model, namely the SWASH model. The model allows for simulating non-hydrostatic phenomena in coastal waters as driven by waves. The model setup is conducted in a rectangular wave flume with paddles to produce monochromatic waves on the left and the wave absorber on the other side. Several scenarios were carried out to determine the effect of variations in wave parameters. To deal with the efficiency of numerically modelled pile breakwater, we also investigate the transmission coefficient. We compare the result of the numerical model with experimental data, which took place in a wave flume at Balai Penelitian dan Pengembangan Pantai, Buleleng, Bali, Indonesia. The validation results demonstrate the capability of the SWASH Model to approximate the incident and transmitted wave height with good accuracy compared to experimental data.
1 citations
TL;DR: In this paper, the wave reflection and run-up process on stepped revetments was investigated by means of full-scale wave flume experiments and it was found that previous small-scale studies underestimate relative run- up heights by 31-51%.
1 citations
TL;DR: In this article , a 1∶30 scale representative geometry of the tide embankment was set up inside a wave flume containing a scaled beach profile representing areas beyond the No-Build Zone mandated by the government.
Abstract: Following the devastating Typhoon Haiyan, a project initiated by the Philippine government, known as Road Heightening and Tide Embankment (RHTE), was constructed to protect the coastal communities of the Leyte region in the Philippines against future storm surges. This research focuses on this newly built structure, which was investigated for coastal flooding and wave overtopping against extreme waves. Experimental and numerical modeling were conducted to simulate wave-structure interaction under different water level conditions. A 1∶30 scale representative geometry of the tide embankment was set up inside a wave flume containing a scaled beach profile representing areas beyond the No-Build Zone mandated by the government. Dam-break wave flow was used to generate turbulent bores similar to that of a storm surge. For the numerical model, SolidWorks and ANSYS CFX version 17.1 software were used. The multiphase Volume of Fluid (VOF) method was used to track the free surface of the fluid flow and was shown to be an accurate tool for numerical validation, as the maximum wave height distributions in the presence of the structure using both methods were in close agreement with one another, but the numerical results overestimated the wave heights. The final design of the tide embankment with a return wall was modeled using ANSYS CFX. Experimental and numerical models generated wave heights that were higher than Typhoon Haiyan with inundation heights of 6 to 9 m above mean sea level (MSL) approaching the structure while the inland wave height was approximately 2 to 4 m above MSL. Results of the experiment also showed that the presence of the structure reduced the water level by 1 to 5 cm (about 0.3 to 1.5 m in actual scale). Moreover, the presence of a return wall will reduce the inland inundation height between 0.1 and 0.5 m above MSL.
1 citations