AN OPEN BOUNDARY CONDITION FOR APPLICATION IN NUMERICAL COASTAL MODELS

Proceedings of the International Conference on Coastal Engineering

Ole Secher Madsen¹  Peifeng Ma² 

[1] Massachusetts Institute of Technology;Singapore-MIT Alliance for Research and Technology

关键词: open boundary condition;    bottom friction;    phase speed;    decay time;    swing door boundary condition;    numerical coastal model;   

DOI  :  10.9753/icce.v32.currents.30

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Open boundaries (OBs) are usually unavoidable in numerical coastal circulation simulations. At OBs, appropriate open boundary conditions (OBCs) are required and a good OBC should be able to let outgoing waves freely pass to the exterior of a computational domain without creating reflections at the OBs. In the present study, a methodology has been developed to predict two parameters, phase speed c_r and decay time T_f, in a standard OBC formulation, so that the OBC is significantly improved compared to commonly used existing OBCs with specified c_r and T_f. For the conditions where wave period is unknown, the OBC with approximated c_r and T_f may be applied and a test reveals that this OBC is able to yield good results in typical coastal flow conditions. In addition, a Swing-Door Boundary Condition (SDBC) is proposed and tested for application at an offshore open boundary where both incoming and outgoing waves exist.

【 授权许可】

Unknown