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Equilibrium Scour-Depth Prediction around Cylindrical Structures
| 题名： | Equilibrium Scour-Depth Prediction around Cylindrical Structures |
| 其他题名： | Achenbach,E.(1968)."Distribution of local pressure and skin friction around a circular cylinder in cross-flow up to Re=5106."J.Fluid Mech.,34(4),625–639. |
| 正文语种： | 英文 |
| 作者： | N. S. Tavouktsoglou |
| 关键词： | structure；dimension；prediction；indri；measurement；interaction；pressure；parameter；velocity；insights |
| 摘要： | Offshore gravity base foundations (GBFs) are often designed with complex geometries. Such structures interact with local hydrodynamics, creating an adverse pressure gradient that is responsible for flow and scour phenomena, including the bed shear stress amplification. In this study, a method is presented for predicting clear-water scour around cylindrical structures with nonuniform geometries under the force of a unidirectional current. The interaction of the flow field with the sediment around these complex structures is described in terms of nondimensional parameters that characterize the similitude of water-sediment movement. The paper presents insights into the influence the streamwise depth-averaged Euler number has on the equilibrium scour around uniform and nonuniform cylindrical structures. Here, the Euler number is based on the depth-averaged streamwise pressure gradient (calculated using potential flow theory), the mean flow velocity, and the fluid density. Following a dimensional analysis, the controlling parameters were found to be the Euler number, pile Reynolds number, Froude number, sediment mobility number, and nondimensional flow depth. Based on this finding, a new scour-prediction equation was developed. This new method shows good agreement with the database of scour depths acquired in this study ðR2 = 0:91+. Measurements of the equilibrium scour depth around nonuniform cylindrical structures were used to show the importance of the Euler number in the scour process. Finally, the importance of the remaining nondimensional quantities with respect to scour was also investigated in this study. |
| 出版年： | 2017 |
| 论文唯一标识： | P-108Y2017V143N05010 |
| 英文栏目名称： | TECHNICAL PAPERS |
| doi： | 10.1061/(ASCE)WW.1943-5460.0000401 |
| 期刊名称： | Journal of Waterway, Port, Coastal, and Ocean Engineering |
| 拼音刊名(出版物代码)： | P-108 |
| 卷： | 143 |
| 期： | 05 |
| 页码： | 98-116 |
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