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110/11/23 14:00 國立新加坡大學劉立方院士 演講
演講公告
張貼人：網站管理員 ╱ 公告日期：2021-11-17演 講 公 告
主講人：劉立方 院士
地點：中央大學科學一館S-325教室
摘要：
講題：On Finite Amplitude Solitary Waves
主講人：劉立方 院士
國立新加坡大學
中央大學水文與海洋科學研究所講座教授
時間：11月23日（星期二）下午2點
地點：中央大學科學一館S-325教室
摘要：
This paper first reviews the existing perturbation solutions for finite amplitude solitary waves. These perturbation solutions are based on either the nonlinearity parameter, α = H/h (Grimshaw 1970; Fenton 1972), or the dispersion parameter, ε = k2 h2 (Fenton 1999; Wu, et al. 2005). The convergence characteristics of these perturbation solutions in terms of the free surface profile and fluid particle velocity are discussed, indicating that some of these solutions do not converge for waves with large enough amplitude. Two other approximated analytical solutions are discussed, and their relationship is explained (McCown 1891; Clamond 1999). To verify the analytical solutions, experiments for finite amplitude solitary waves are conducted in a wave flume. Both free surface profile and velocity field are measured using wave gage, PIV, and ADV. A range of α values, up to 0.6, has been used in the experiments. Detailed comparisons between the experimental data and existing theories are made. The solutions for the free surface profile, calculated from various theories, are more or less the same as the measurements, even for large wave amplitudes. However, the theoretical solutions for the velocity field deviate from the measured data significantly under the wave crest, especially for large amplitude waves.
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| The horizontal (upper panel) and vertical velocity (lower panel) components under solitary wave for H/h = 0.597 in h = 0.18 m. |
最後修改時間：2021-11-08 PM 1:27
