【作者】 史舒婧； 黄杰； 梁东方； 张景新；

【Author】 SHI Shu-jing;HUANG Jie;LIANG Dong-fang;ZHANG Jing-xin;School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University;

【机构】 上海交通大学船舶海洋与建筑工程学院；

【摘要】 海底排污口将成为沿海地区可持续和环境敏感的废水管理战略的重要组成部分。本研究基于N-S方程和有限体积法,在FLUENT中进行二次开发,通过用户定义函数(UDF)使用有限差分方法求解泥沙输运方程,建立了模拟海底管线周围三维流动和冲刷的数值模型。根据一段时间内的推移质输沙率得到床面节点的高程变化,再通过动网格技术更新床面网格形状,并采用了一种对流场计算时间与床面冲刷计算时间进行耦合的方法来提高计算效率。利用该数值模型,模拟了沿管道展向初始冲坑的深度变化,分析三维流动与冲坑肩部发展的规律,得到了冲坑展向发展的特点。更多还原

【Abstract】 A numerical model has been developed for predicting the flow and local scour around offshore structures.The commercial software FLUENT is used as the flow solver,which is based on the unsteady Reynolds-averaged Navier-Stokes equations with standard turbulence closure.The bedload sediment transport equations are then solved using the finite difference method through User-Defined-Functions(UDFs).The change in the bed level is calculated from the continuity equation of sediment transport.A dynamic re-meshing algorithm is used to update the bed positions during the simulation.An efficient time-marching algorithm is adopted to speed up the computation.Using the newly-developed model,this paper simulates the bed changes adjacent to a pipeline,with the focus on the three-dimensional flow pattern.The characteristic of the spanwise development of the scour hole is then summarized.更多还原