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Clear water scour around a finite array of cylinders
HighlightsClear-water scour and deposition patterns around a finite array of cylinders under steady flow conditions were experimentally investigated.Flume experiments were performed for four different array densities under three different orientations.The morphometric characteristics of scour around the finite array of cylinders were quantified by means of laser scanner.The scour results for solid cylinders of equal circumambient diameter were compared with the array of cylinders.The findings revealed that the array of cylinders generate 27% less scour volume compared to its single solid cylinder counterpart.
AbstractThis experimental study presents clear-water scour and deposition patterns around hexagonal arrays of circular cylinders in steady flow conditions. Understanding the scour processes around such configurations could facilitate the design of several hydraulic and marine engineering structures, such as bridge piers and piles. The flow alteration caused by the examined porous obstacles depends on the solid volume fraction of the obstacles and on the angle of attack of the incoming flow, due to the limited number of cylinders constituting the array. Flume experiments with erodible bed were carried out for four array densities (solid volume fractions: 0.14, 0.20, 0.32 and 0.56) under three different orientations (regular, angled and staggered configurations). The scour/deposition characteristics were obtained by means of laser scanner and the results were compared to solid cylinders of equal circumambient diameter. Different angles of attack of the incoming flow lead to different blockage ratios, which have direct impact on the scour characteristics and deposition patterns. The arrays with the higher solid volume fraction generated scour/deposition patterns similar to solid cylinder, while in the arrays with the lower solid volume fractions, local scour around the individual small cylinders became evident. Finally, considering that the load bearing capacity of a pier basically depends on the area of its cross-section, a comparison of the maximum induced scour depth and volume by the cylinder arrays and the solid cylinder with equal solid cross-sectional area is presented, in order to introduce an alternative pier configuration that induces less scour. The results showed that the array of cylinders could generate 27% less scour volume and 22% less scour depth compared to its single solid cylinder counterpart.
Clear water scour around a finite array of cylinders
HighlightsClear-water scour and deposition patterns around a finite array of cylinders under steady flow conditions were experimentally investigated.Flume experiments were performed for four different array densities under three different orientations.The morphometric characteristics of scour around the finite array of cylinders were quantified by means of laser scanner.The scour results for solid cylinders of equal circumambient diameter were compared with the array of cylinders.The findings revealed that the array of cylinders generate 27% less scour volume compared to its single solid cylinder counterpart.
AbstractThis experimental study presents clear-water scour and deposition patterns around hexagonal arrays of circular cylinders in steady flow conditions. Understanding the scour processes around such configurations could facilitate the design of several hydraulic and marine engineering structures, such as bridge piers and piles. The flow alteration caused by the examined porous obstacles depends on the solid volume fraction of the obstacles and on the angle of attack of the incoming flow, due to the limited number of cylinders constituting the array. Flume experiments with erodible bed were carried out for four array densities (solid volume fractions: 0.14, 0.20, 0.32 and 0.56) under three different orientations (regular, angled and staggered configurations). The scour/deposition characteristics were obtained by means of laser scanner and the results were compared to solid cylinders of equal circumambient diameter. Different angles of attack of the incoming flow lead to different blockage ratios, which have direct impact on the scour characteristics and deposition patterns. The arrays with the higher solid volume fraction generated scour/deposition patterns similar to solid cylinder, while in the arrays with the lower solid volume fractions, local scour around the individual small cylinders became evident. Finally, considering that the load bearing capacity of a pier basically depends on the area of its cross-section, a comparison of the maximum induced scour depth and volume by the cylinder arrays and the solid cylinder with equal solid cross-sectional area is presented, in order to introduce an alternative pier configuration that induces less scour. The results showed that the array of cylinders could generate 27% less scour volume and 22% less scour depth compared to its single solid cylinder counterpart.
Clear water scour around a finite array of cylinders
Yagci, Oral (author) / Yildirim, Isilsu (author) / Celik, Mehmet Furkan (author) / Kitsikoudis, Vasileios (author) / Duran, Zaide (author) / Kirca, V.S. Ozgur (author)
Applied Ocean Research ; 68 ; 114-129
2017-08-23
16 pages
Article (Journal)
Electronic Resource
English
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