桥墩型式对流场的影响分析
首发时间:2019-08-22
摘要:运用流体分析软件Fluent研究圆形、圆端形和矩形桥墩的二维绕流,在相同条件下进行流场分析,确定对流场分布最不利的墩型。为选取合适墩型,分别建立三种墩型的单、双墩二维绕流模型,分析双墩间距对升阻力系数的影响。研究结果表明:矩形桥墩的升阻力系数幅值变化较大,表现出明显的湍流效应;单墩的St值较双墩的St值小,但其差值在9%以内;墩间距大于20m时,双墩绕流时的流速、涡量分布受到墩间距的影响较小。
关键词: 桥梁工程 不同型式的桥墩 墩间距 流速分布 涡量分布 斯特哈尔数
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Analysis of influence of pier type on flow field
Abstract:In this paper, the fluid analysis software Fluent is used to study the two-dimensional flow around circular, circular and rectangular piers. Flow field analysis is carried out under the same conditions to determine the pier type which is most disadvantageous to the flow field distribution.In order to select the suitable pier type, two-dimensional flow around single and double piers of three pier types are established respectively, and the influence of the spacing between two piers on the lift-drag coefficient is analyzed.The results show that the lift-drag coefficient of rectangular pier varies greatly, showing obvious turbulence effect.The ST value of single pier is smaller than that of double pier, but the difference is less than 9%.When the spacing of piers is greater than 20 m, the velocity and vorticity distribution of flow around two piers are less affected by the spacing of piers.
Keywords: Bridge Engineering Different types of piers Pier spacing Velocity distribution Vorticity distribution Stehar number
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