近床面水平圆柱局部冲刷二维数值模拟  

Two-dimensional numerical simulation of local scour around horizontal cylinder near sand bed

作　　者：张芝永[1] 拾兵[1] 范菲菲[1] 阮雪景[1] 

机构地区：[1]中国海洋大学工程学院,青岛266003

出　　处：《计算力学学报》2012年第5期759-764,共6页Chinese Journal of Computational Mechanics

基　　金：国家863计划(2008AA09Z309);国家自然科学基金(50879084)资助项目

摘　　要：为研究近床面水平圆柱的局部冲刷问题,基于N-S方程和有限体积法,在FLUENT中通过二次开发建立了局部冲刷二维数值模型。模型采用标准k-ε紊流模型来计算水平圆柱周围的流场,同时借助FLUENT软件中的自定义函数功能提取床面剪应力参数来计算该时刻的推移质输沙率及床面节点位移变化值,然后运用动网格技术来模拟床面地形的变化,通过物理模型试验来进行模型验证。结果表明,计算结果与试验结果基本一致,从而证实了冲刷模型的准确性。In order to study the local scour around the horizontal cylinder near sand bed,a 2-d numerical model of local scour based on N-S equations and finite volume method is established through the redevel- opment in FLUENT code. Firstly, the flow field around the horizontal cylinder is calculated by using standard k-e equations,and the bed-load transport rate is computed by the selected empirical formula re- lated to the bed shear stress via UDF （user defined function） . Then,the bed profile is simulated by means of dynamic mesh. The model is verified by the physical experiment. The results show that the pre- dictions agree well with the experimental results, which certifies the numerical model＇s reliability.

关 键 词：水平圆柱 局部冲刷 动网格 UDF 

分 类 号：TP334.2[自动化与计算机技术—计算机系统结构]