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管线周围的水动力因素是管线冲刷的主要原因之一。基于OpenFOAM开源程序,结合改进后的速度入口造波法,建立三维波浪数值水槽,耦合分离涡紊流模拟方法,对管线周围水动力特性进行研究。分析了波浪入射角为30°、45°、60°和90°和KC数为5、8和11的波浪作用下,管线周围的流场结构进行分析,探讨入射角和KC数对管线周围水流结构的影响规律。结果表明:波浪作用下,入射角和KC数对管线周围水流结构具有较明显的影响。且随入射角增大,管上表面水流分离现象明显,管后正负涡量相邻分布的特征减弱;随KC数增大,管线附近涡量分布范围增大,正负涡量逐渐分离。
Hydrodynamic factors around the pipeline is one of the main causes of pipeline erosion. Based on the OpenFOAM open source program and the improved velocity inlet wave method, a three-dimensional wave numerical tank and coupled separation vortex turbulence simulation method are established to study the hydrodynamic characteristics around the pipeline. The structure of the flow field around the pipeline is analyzed under the action of waves with wave incidence angles of 30 °, 45 °, 60 ° and 90 ° and KC numbers of 5, 8 and 11, and the effect of incident angle and KC number on the water flow around the pipeline Structure of the law of influence. The results show that the incidence angle and KC number have a significant influence on the water flow structure around the pipeline under wave action. With the increase of incident angle, the phenomenon of water flow separation on the pipe surface is obvious, and the characteristics of the adjacent distribution of positive and negative vorticity are weakened. With the increase of KC, the range of vorticity distribution increases and the positive and negative vorticity gradually separates.