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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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Journal ArticleDOI
TL;DR: Based on the potential theory, the wave force, including the linear and part of the second-and higher-order force components, was identified using recursive least squares (RLS) in real-time as discussed by the authors .
Journal Article
TL;DR: Abcha et al. as discussed by the authors studied the physical processes involved in the transformation of these waves from the open sea to the coastal zone, despite the significant impact these waves may have on the coasts, such as overtopping, material damages, and erosion.
Abstract: Sudden waves of considerable height are frequently observed at sea. These waves, with abnormally high amplitude, do not occur only in deep Ocean, but also in the coastal zone. A lot of studies have considered these waves in the open ocean; however, they have received little attention in the coastal zone. The physical processes involved in the transformation of these waves from the open sea to the coastal zone are poorly understood, despite the significant impact these waves may have on the coasts, such as overtopping, material damages, and erosion. The aim of the present work is to bring a contribution to the study of these processes from physical modeling. Present tests are carried out in a 22 m long, 0.8 m wide, and 0.8 m high wave flume. Solitary waves are generated. Preliminary tests have been performed to compare the characteristics of the experimental waves with the theoretical prediction of Boussinesq [1]. A good agreement is obtained as well for the wave form, than for the wave speed and duration. The transformation of solitary waves during their propagation towards the shore has been studied using an artificial 4% slope in the flume, placed 9.5m downwards from the wave paddle. A particular attention has been focused on the evolution of the wave energy. Above the 9.5m long horizontal bed upwards from the slope, an energy dissipation ranging from 20 % to 30 % has been obtained. However, the wave energy was found to increase during the propagation of the solitary waves above the sloping bottom, from 15 % to 30 % according to the considered tests, in agreement with the results depicted in [2]. Sapce-time diagrams have been plotted, allowing to describe the propagation of solitary waves above the horizontal and sloping bed. On these diagrams we can clearly see that the solitary wave has a symmetric profile about its crest and an approximately constant celerity before it reaches the slope. The wave height then increases when the solitary wave climbs up the slope. As water depth decreases, the solitary wave progresses with increasing of asymmetry and the front became more and more steep. Finally, the maximum runup is considered, and a new formula is proposed for its estimation (depending on the tangent of the 4% slope) Formation of freak waves resulting from the focusing wave group propagating in finite water depth was also investigated experimentally. Runup, breaking and energy dependence have been investigated. References [1] N.Abcha, N.Leblond(2014), Etude d'une onde solitaire se propageant en presence d'un courant, 14eme congres francophone de technique laser, Marseille,15-19 septembre 2014. [2] L.Chang et al. (2014), Prebreaking internal velocity field induced by a solitary wave propagating over a 1:10 slope, Ocean Engineering 80 (2014), 1-12.
Book ChapterDOI
25 Sep 2019
TL;DR: In this article, the main column of a tripod offshore wind turbine in regular and random wave conditions in the Large Wave Flume in Hannover, Germany was investigated, and the mean values of CD vary from 0.61 to 0.95 with a standard deviation of 0.17 to 1.18.
Abstract: This paper presents results from an experimental work to investigate wave loading on the main column of a tripod offshore wind turbine in regular and random wave conditions in the Large Wave Flume in Hannover, Germany. In-line force coefficients (drag and inertia coefficients) are estimated from the measured pressures on the tripod surface at different elevations along the length of the column. The wave kinematics are estimated by using different wave theories. Methods of max-min and least-squares (simplified by fit on wave-by-wave basis) are applied to determine the force coefficients. It is found that the drag coefficient, CD, has larger scattering than the inertia coefficient CM. The drag coefficient CD is very sensitive in its estimation. The mean values of CD vary from 0.61 to 0.95 with standard deviation of 0.17 to 0.18. The inertia coefficient, CM, shows small scatter and has its mean value varies from 1.15 to 1.23 with a standard deviation of 0.07 to 0.08 for the tested regular waves. The tested spectral waves give the inertia coefficient CM varies from 0.96 to 1.31 with standard deviation of 0.41 to 0.43.
Journal ArticleDOI
01 Jan 2002
TL;DR: In this paper, the authors review previous researches on the long period waves and consider the problems in the reflection of effects of long-period waves into the design of coastal facilities.
Abstract: The long-period waves have been researched in recent years because of its importance in the various problems of coastal engineering, such as long-period oscillation, long-period motions of moored vessels, sediment transport, wave-overtopping and stability of coastal structures. Importance of long period waves have been well recognized, however, its reflection of effects of the long-period waves into design of coastal facilities is not sufficient.In this paper, we review previous researches on the long period waves and consider the problems in the reflection of effects of long-period waves into design of coastal facilities.

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