沙纹床面上波流共同作用的数值模拟  

Numerical simulation for joint action of wave and current on rippled sea bed

作　　者：蒋昌波[1] 白玉川[2] 赵子丹[2] 张红武[3] 

机构地区：[1]长沙理工大学河海工程学院,湖南长沙410076 [2]天津大学建筑工程学院,天津300072 [3]清华大学水利水电工程系,北京100084

出　　处：《水利学报》2005年第1期62-68,共7页Journal of Hydraulic Engineering

基　　金：国家自然科学基金项目(10202003;50479015);国家杰出青年科学基金项目(50125924)

摘　　要：海滨地区广泛存在涡动沙纹,它很大程度上决定着波浪衰减和泥沙运动。本文建立了描述波浪、水流共同作用下底层流动特性的立面二维数值模型。模型成功模拟了波浪、水流共同作用下底层分离涡随时间、空间变化的动力特性,文中还进一步对波浪、水流不同对比情况下的涡动力特性及分离涡尺度和紊动特性进行了讨论。Vortex ripples widely exist in coastal area and greatly control the attenuation of wave and movement of sediment. The flow structure around the vortex ripples can be modeled as a 2-D flow due to the geometry of the flow boundary. In this paper, a 2-D large-eddy-simulation method (LES) was used to predict the flow structure and the dynamic characteristics of vortex in the sea bed under the joint action of wave and current. The result gives the whole process of the formation, evolvement and disappearance of vortex. Furthermore, the dynamic characteristics of vortex, its scale and turbulent characteristics of separated vortex under different combinations of wave and current were investigated.

关 键 词：波流边界层 涡动沙纹 数学模型 

分 类 号：TV142[水利工程—水力学及河流动力学]