| NING Dezhi,TENG Bin,LIU Shuxue. 2009. Nonlinear numerical simulation on extreme-wave kinematics. Acta Oceanologica Sinica, (3):75－81 |
| Nonlinear numerical simulation on extreme-wave kinematics |
| Nonlinear numerical simulation on extreme-wave kinematics |
| Received:April 04, 2008 Revised:October 16, 2008 |
| DOI： |
| Key words:numerical wave tank image Green function higher-order boundary element method fully nonlinear extreme wave |
| 中文关键词: numerical wave tank image Green function higher-order boundary element method fully nonlinear extreme wave |
| 基金项目:The National Natural Science Foundations of China under contract Nos 50709005 and 50639030, the Program for Changjiang Scholars and Innovative Research Teams of Universities and Colleges of China under contract No. IRT0420 and the National High Tech Research and Development Program of China under contract No.2006AA09A109-3. |
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| Abstract: |
| A fully nonlinear numerical model based on a time-domain higher-order boundary element method (HOBEM) is founded to simulate the kinematics of extreme waves. In the model, the fully nonlinear free surface boundary conditions are satisfied and a semi-mixed Euler-Lagrange method is used to track free surface; a fourth-order Runga-Kutta technique is adopted to refresh the wave elevation and velocity potential on the free surface at each time step; an image Green function is used in the numerical wave tank so that the integrations on the lateral surfaces and bottom are excluded. The extreme waves are generated by the method of wave focusing. The physical experiments are carried out in a wave flume. On the horizontal velocity of the measured point, numerical solutions agree well with experimental results. The characteristics of the nonlinear extreme-wave kinematics and the velocity distribution are studied here. |
| 中文摘要: |
| A fully nonlinear numerical model based on a time-domain higher-order boundary element method (HOBEM) is founded to simulate the kinematics of extreme waves. In the model, the fully nonlinear free surface boundary conditions are satisfied and a semi-mixed Euler-Lagrange method is used to track free surface; a fourth-order Runga-Kutta technique is adopted to refresh the wave elevation and velocity potential on the free surface at each time step; an image Green function is used in the numerical wave tank so that the integrations on the lateral surfaces and bottom are excluded. The extreme waves are generated by the method of wave focusing. The physical experiments are carried out in a wave flume. On the horizontal velocity of the measured point, numerical solutions agree well with experimental results. The characteristics of the nonlinear extreme-wave kinematics and the velocity distribution are studied here. |
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