基于欧拉模型的泥沙冲刷数值模拟  

The numerical simulation of sediment scour based on a Eulerian model

作　　者：袁庆晴 赵敏[1] 葛彤[1] 汪淳[1] YUAN Qingqing;ZHAO Min;GE Tong;WANG Chun(School of Naval Architecture,Ocean & Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《哈尔滨工程大学学报》2019年第1期47-53,共7页Journal of Harbin Engineering University

基　　金：工信部高技术船舶科研计划(工信部联装[2012]539号);高等学校博士学科点专项科研基金新教师类资助项目(20120073120014);国家发展与改革委员会海洋工程装备研发及产业化项目(沪发改高级[2014]62号)

摘　　要：在使用欧拉模型进行泥沙定点冲刷的数值计算时,会产生不合理的床面波动和冲刷坑回填现象。为合理体现泥沙相在静止状态时的固体性质,并且反映水下泥沙堆积的特性,本文通过加载源项引入泥沙起动模型和水下休止角模型,修正了欧拉模型泥沙相的动量方程。数值计算结果分别和轴对称、平面泥沙冲刷实验比较,发现计算模型能较好获得轴对称冲刷的冲刷坑深度和宽度等形态参数;在连续冲刷的平面实验中,计算模型也能反应出泥沙相固态特征,准确捕捉不同时刻的冲刷坑内形态。数值计算得到的冲刷坑周围流体特征反映出水流不再使交界面的泥沙起动,克服了欧拉模型的不足。In the numerical simulation of sediment scour using a Eulerian model,unreasonable wavy interface and scour hole backfill may be found.To reasonably simulate the solid and depositional properties of sediment in a static regime,and to reflect sediment accumulation characteristics underwater,the source term in the momentum equation of the sedimentation phase in a Eulerian model was modified.We added the source item to introduce the modeled incipient motion and the modeled underwater repose angle.The numerical calculation results were compared with the axisymmetric scouring and planar sediment scouring models.We found that,through this model configuration,we could obtain the parameters of the hole that is scouring asymmetrically,including depth and width.With our continuously scouring planar model,the solid property of sediment was represented correctly and the scour hole shapes at different moments were also well predicted.The flow characteristics around the scouring hole obtained in the simulation showed that sand around the boundary cannot be moved by flow,thereby overcoming the shortcomings of the Eulerian model.

关 键 词：泥沙冲刷 数值模拟 轴对称冲刷 平面冲刷 欧拉模型 用户自定义函数 起动模型 水下休止角 

分 类 号：O359[理学—流体力学]