| The initialization of nonlinear water waves in a numerical wave flume |
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| 作者姓名： | ZHAO Xizeng SUN Zhaochen LIANG Shuxiu |
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| 作者单位： | ZHAO Xizeng(State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China; Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan);SUN Zhaochen,LIANG Shuxiu(State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China) |
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| 基金项目： | Foundation item： The National Natural Science Foundation of China under contract No. 50779004. |
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| 摘 要： | This study investigates the initialization of nonlinear free-surface simulations in a numerical wave flume.Due to the mismatch between the linear input wavemaker motion and the kinematics of fully nonlinear waves,direct numerical simulations of progressive waves,generated by a sinusoidally moving wavemaker,are prone to suffering from high-frequency wave instability unless the flow is given sufficient time to adjust.A time ramp is superimposed on the wavemaker motion at the start that allows nonlinear free-surface simulations to be initialized with linear input.The duration of the ramp is adjusted to test its efficiency for short waves and long waves.Numerical results show that the time ramp scheme is effiective to stabilize the wave instability at the start of the simulation in a wave flume.
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| 关 键 词： | 数值波浪水槽 非线性水波 初始化 直接数值模拟 时间调整 完全非线性波 不稳定 自由表面 |
| 收稿时间： | 2008/12/11 0:00:00 |
| 修稿时间： | 4/7/2009 12:00:00 AM |
The initialization of nonlinear water waves in a numerical wave flume |
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| ZHAO Xizeng,SUN Zhaochen,LIANG Shuxiu.The initialization of nonlinear water waves in a numerical wave flume[J].Acta Oceanologica Sinica,2009,28(6):93-102. |
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| Authors: | ZHAO Xizeng SUN Zhaochen and LIANG Shuxiu |
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| Institution: | 1.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China;Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan2.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China |
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| Abstract: | This study investigates the initialization of nonlinear free-surface simulations in a numerical wave flume. Due to the mismatch between the linear input wavemaker motion and the kinematics of fully nonlinear waves, direct numerical simulations of progressive waves, generated by a sinusoidally moving wavemaker, are prone to suffering from high-frequency wave instability unless the flow is given sufficient time to adjust. A time ramp is superimposed on the wavemaker motion at the start that allows nonlinear free-surface simulations to be initialized with linear input. The duration of the ramp is adjusted to test its efficiency for short waves and long waves. Numerical results show that the time ramp scheme is effective to stabilize the wave instability at the start of the simulation in a wave flume. |
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| Keywords: | wave flume wavelet transform time ramp wave instability wavemaker |
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