Topic
Groyne
About: Groyne is a research topic. Over the lifetime, 397 publications have been published within this topic receiving 4549 citations. The topic is also known as: groin & Breakwater.
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TL;DR: In this paper, the authors conducted the experiments on the permeability and installation angle of groyne and suggested the data for groynes selection in environmental point as analyzing scour area.
Abstract: There has been debated on the fact that a scour hole produced by the construction of a groyne has environmental benefits such as provision of diverse underwater habitats and shelter for fish in the event of flooding. Therefore researches are focusing on the scour field around the groyne area beyond the existing safety issues. The scour area on aquatic habitats would format many form on groyne conditions so that the analysis of scour area is strongly required. This study conducted the experiments on permeability and installation angle of groyne and suggested the data for groyne selection in environmental point as analyzing scour area. The physical modeling was performed in different permeability (0%, 20%, 40%, 60%, 80%) and installation angle of groyne (). As the result of the study, scour area and scour depth at maximum scour condition was revealed for each case and suggested the differences according to experiment conditions.
TL;DR: In this article, a scale model was installed in the shallow water channel and experiments were conducted by means of surface flow visualization technique, where a particle tracking velocimetry (PTV) method was adopted to estimate the instantaneous velocity fields to cope with the problem of a very high dynamic velocity range behind the groyne.
Abstract: To investigate the instantaneous flow patterns around a single groyne, a scale model was installed in the shallow water channel and experiments were conducted by means of surface flow visualization technique. A particle tracking velocimetry (PTV) method has been developed for shallow flow conditions and has been adopted to estimate the instantaneous velocity fields to cope with the problem of a very high dynamic velocity range behind the groyne. Proper orthogonal decomposition (POD) is applied to obtain an effect of the fluctuating flow pattern and its coherent structures. Conditional sampling technique (CST) is also applied to reveal the advection properties of POD decomposed flow pattern. POD decomposed coherent patterns and their advection properties under submerged and emerged conditions. One of main results is the distribution of coherent vortices generated at the groyne tip due to high shear forces in the mixing layer between main stream and dead zone.
01 Jan 2008
TL;DR: In this paper, the effects of the cross-shore and groyne wall slopes on flow pattern around an impermeable Groyne were considered using a three-dimensional numerical CFD model (i.e., FLUENT).
Abstract: The groynes which are typical of shore protective structures can provide several aims. Although these structures may partly help to shoreline protection, they would also create some major problems in adjacent regions. Therefore the real performance of these structures needs to be considered carefully before going to construction. In this research, the effects of the cross shore and groyne wall slopes on flow pattern around an impermeable groyne were considered using a three-dimensional numerical CFD model (i.e., FLUENT). The widely accepted eddy viscosity concept and k-e turbulence model were used to evaluate the Reynolds stresses and eddy viscosity coefficients, respectively. The finite volume method used in the software makes attractive flexibility to use any shape of grids to cover the cross and structural slopes in the computational domain. The model was first applied to a vertical groyne on a flat bed and the numerical model results were compared with experimental data. The model results of this numerical test showed a very good agreement with the corresponding experimental measurements, in terms of water elevation and velocity magnitudes. The model was then applied to a series of structures with different lateral slopes on various cross sectional bed slope. It was found that the flow pattern around the groyne was not changed significantly when the slopes of the structure and bed were slightly changed. The numerical model results, however, showed that by increasing the cross shore slope in any case of the lateral slope of the structure, the magnitude of the maximum velocity was decreased. The bed shear stresses were also decreased when the cross shore slope was increased. Moreover, these values were further decreased when the groyne-wall slope was reduced.Copyright © 2008 by ASME
29 Sep 2020