| ZHAO Xizeng,SUN Zhaochen,LIANG Shuxiu. 2009. The initialization of nonlinear water waves in a numerical wave flume. Acta Oceanologica Sinica, (6):93－102 |
| The initialization of nonlinear water waves in a numerical wave flume |
| The initialization of nonlinear water waves in a numerical wave flume |
| Received:December 11, 2008 Revised:April 07, 2009 |
| DOI： |
| Key words:wave flume wavelet transform time ramp wave instability wavemaker |
| 中文关键词: wave flume wavelet transform time ramp wave instability wavemaker |
| 基金项目:The National Natural Science Foundation of China under contract No.50779004. |
| Author Name | Affiliation | E-mail | | 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 | Xizengzhao@gmail.com | | SUN Zhaochen | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China | | | LIANG Shuxiu | 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 effiective to stabilize the wave instability at the start of the simulation in a wave flume. |
| 中文摘要: |
| 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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