Tests and Applications of An Approach to Absorbing Reflected Waves Towards Incident Boundary  

作　　者：张洪生 王炎 许春辉 商辉 于小伟 

机构地区：[1]College of Ocean Environment and Engineering, Shanghai Maritime University [2]State Key Laboratory of Ocean Engineering, Shanghai JiaoTong University [3]Department of Water Transport, Ministry of Transportation [4]Shanghai Zhenhua Heavy Industries Co. LTD

出　　处：《China Ocean Engineering》2013年第6期703-718,共16页中国海洋工程（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.51079082 and 40676053);the LRET through the joint centre involving University College London,Shanghai JiaoTong University and Harbin Engineering University

摘　　要：If the upstream boundary conditions are prescribed based on the incident wave only, the time-dependent numerical models cannot effectively simulate the wave field when the physical or spurious reflected waves become significant. This paper describes carefully an approach to specifying the incident wave boundary conditions combined with a set sponge layer to absorb the reflected waves towards the incident boundary. Incorporated into a time-dependent numerical model, whose governing equations are the Boussinesq-type ones, the effectiveness of the approach is studied in detail. The general boundary conditions, describing the down-wave boundary conditions are also generalized to the case of random waves. The numerical model is in detail examined. The test cases include both the normal one-dimensional incident regular or random waves and the two-dimensional oblique incident regular waves. The calculated results show that the present approach is effective on damping the reflected waves towards the incident wave boundary.If the upstream boundary conditions are prescribed based on the incident wave only, the time-dependent numerical models cannot effectively simulate the wave field when the physical or spurious reflected waves become significant. This paper describes carefully an approach to specifying the incident wave boundary conditions combined with a set sponge layer to absorb the reflected waves towards the incident boundary. Incorporated into a time-dependent numerical model, whose governing equations are the Boussinesq-type ones, the effectiveness of the approach is studied in detail. The general boundary conditions, describing the down-wave boundary conditions are also generalized to the case of random waves. The numerical model is in detail examined. The test cases include both the normal one-dimensional incident regular or random waves and the two-dimensional oblique incident regular waves. The calculated results show that the present approach is effective on damping the reflected waves towards the incident wave boundary.

关 键 词：incident boundary sponge layer reflected waves Boussinesq-type model general boundary conditions 

分 类 号：P714[天文地球—海洋科学]