梯形消波艙防波堤之波流場解析

Wave and Flow Characteristics on Breakwater with Trapezoidal Wave-Chamber

蔡清標(Ching-Piao Tsai) ； 王柏棟(Po-Tung Wang) ； 林建志(Jian-Chih Lin) ； 王志成(Jyh-Cherng Wang) ； 陳吉紀(Chi-Chi Chen)

《海洋工程學刊》 11卷1期 (2011/07) Pp. 57-70

https://doi.org/10.6266/JCOE.2011.1101.04

摘要

本研究針對具梯形消波艙之新型沈箱防波堤進行波流場解析，文中並探討紊流能損、波浪反射率及堤面波壓力分佈特性。數值解析係以三維RANS方程式及RNG紊流模式為基礎，以有限差分法配合FAVOR網格障礙物處理技術及流體體積法解析之。經由數值模擬與模型試驗之波形及波壓分佈比較，顯示計算結果具有很好的精確度。研究結果顯示當消波艙寬度B與波長L之比值B/L=0.15時，有最佳之消波效果，其波浪反射率小於0.2，而設置消波艙情況下的總波力約僅為不設置消波艙情況的37.5%。

關鍵字

消波艙 ； 防波堤 ； RANS ； RNG紊流模式 ； 反射率 ； 紊流能損 ； 波力

並列摘要

It is well known that a perforated-wall caisson breakwater does not only reduce the wave reflection but also the wave forces when comparing to a traditional caisson breakwater. In this paper, the numerical simulation was presented to investigate the characteristics of waves on the caisson breakwater with a trapezoidal wav-chamber. The three-dimensional RANS with RNG turbulent model was applied for the numerical simulation. The turbulent energy dissipation, wave reflection and the wave pressure distribution were analyzed. The numerical results of wave profiles and pressure variations were first verified with the experimental data. The numerical simulations show obvious reduction of the wave reflection and the wave force induced by the wave-chamber. The results indicated that the wave reflection from the trapezoidal wave-chamber and the wave force on the breakwater is minimal when B/L is about 0.15 where L is the wavelength and B is the width of wave chamber.

並列關鍵字

Wave-chamber ； breakwater ； RANS, RNG turbulent model ； reflection, turbulent energy dissipation ； wave force