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Investigation of Solitary Wave on Breakwater with Wave Chamber
|關鍵字:||孤立波;Solitary Wave;消波艙;防波堤;Wave Chamber;Breakwater||出版社:||土木工程學系所||引用:||1. 蔡清標、王柏棟、林建志、王志成、陳吉紀(2011)，「梯形消波艙防波堤之波流場解析」，海洋工程學刊第11卷第1期，57頁-70頁。 2. 蔡清標、程弘義 (2011)，「具雙層消波艙室開孔防波堤之波流場模擬」，國立中興大學研究所碩士學位論文，台中。 3. Bergmann, H., and Oumeraci, H., (2000). “Performance of new multi chamber systems vs. conventional Jarlan caisson breakwaters,” Journees Nationales Genie Civil- Genie Cotier, Caen, France, pp. 299-306. 4. Chiou, Y.D., and Chien, C.H., (2002). “Joint probability distribution of impulsive wave force and rising time for plunging and spilling breaker,” Ocean Engineering. 5. Fenton, J.D., and Rienecker, M.M., (1982). “A Fourier method for solving nonlinear water-wave problems: application to solitary-wave interactions,” Journal of Fluid Mechanics, Vol. 118, pp. 411-443. 6. Flow Science, Inc., (2009) Flow 3D User Manual. 7. Goda, Y., (1985). “Random Seas and Design of Maritime Structures,” University of Tokyo Press, Tokyo, Japan. 8. 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本文首先與Synolakis (1986)孤立波在斜坡底床之傳遞及 Fenton & Rienecker (1982)孤立波對直立壁作用力之結果比較，顯示本文對孤立波之數值模擬具有很好的精確度。孤立波具有經長時間傳遞而不變形之特性，當孤立波流入消波艙室時，會在壁面開孔處產生渦流，其強度會隨不同波高與水深比增加而有所不同。隨著渦流在消波艙室進而產生紊流能量(TKE)及紊流消散(DTKE)，TKE及DTKE隨著波流流經消波艙室所產生的渦度而逐漸增加有最大值產生﹐爾後隨波流流出消波艙室後而下降。因消波艙室之作用反射率及波壓均小於傳統直立堤之全反射，具消波艙之新型防波堤反射率介於0.6~0.8之間。當孤立波作用至防坡堤瞬間會有衝擊波力之產生，衝擊波力具有雙峰特性，在波高水深比H/h=0.3~0.4時，孤立波對防波堤所產生之受力峰值不明顯；H/h=0.4~0.78中，波浪衝擊至防波堤有明顯雙峰值產生，結果顯示直立堤在設置消波艙後，孤立波作用於直立壁面之衝擊力有降低之現象。
The purpose of this paper is to investigate numerically the wave and flow characteristics of solitary wave on the new type breakwater with wave chamber, including wave pressure, reflection, turbulent energy and dissipation and characteristics of impulsive force. A computational fluid dynamic model, Flow-3D, was applied to the numerical simulation based on the three-dimensional RANS equation associated with the RNG turbulent model.
The numerical results of wave profiles and solitary wave force variations were verified with the experimental data by Synolakis (1986) and Fenton & Rienecker (1982), and the results was compared with the previous experimental results as well. Solitary wave energy would not decay when it propagated. When solitary wave passes through the wave chamber, the vortex generate at perforated wall. The vortex strength alters with the ratio of wave height and water depth. And the total turbulent kinetic energy (TKE) and dissipation of turbulent kinetic energy (DTKE) were generated. TKE and DTKE values increase and have its maximum value as the wave passed the upper sloping-slit. Then they are reduced during the wave passed out the wave chamber. The numerical simulations show the obvious reduction of the wave reflection and the wave pressure by the wave chamber. The results indicated that the wave reflection from the wave chamber between 0.6~0.8. Impulse force generated when solitary wave impulse on breakwater, H/h=0.4~0.78. The breakwater with chamber can reduce wave force effectively than traditional vertical breakwater.
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