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題名 | 採用假想消能領域模擬翼板式防波堤之水動力特性研究=Simulation of Hydrodynamic Performance of Curtain-Wall Breakwater Using Hypothetical Dissipation Domain |
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作 者 | 岳景雲; 莊世璿; 文軍強; 江愷; | 書刊名 | 海洋工程學刊 |
卷期 | 17:2 2017.06[民106.06] |
頁次 | 頁115-138 |
分類號 | 443.31 |
關鍵詞 | 假想消能領域; 消散係數; 翼板式防波堤; 多領域邊界元素法; Hypothetical dissipation domain; Dissipation coefficient; Curtain-wall breakwater; Multi-domain boundary element method; MBEM; |
語文 | 中文(Chinese) |
中文摘要 | 波浪通過翼板式防波堤時,由於翼板邊緣效應引發渦流現象而產生能量的消散。然而一般的勢能理論中無法充分反映此一能量消散。Nakamura and Ide(1997)提出在翼板前後設置各1/8入射波長寬度的假想消能領域的構想,但數值模擬結果與試驗相比較則有反射率偏小的情形。經檢討後,發現可能在翼板正前方設置消能區而導致反射波大量減少所致。因此,乃修正前方消波區為翼板以下的通水區域,修正翼板底部至海底底床;而背浪側(透射端)高度仍然為自由水面至海底底床,消散係數固定為f_v =0.15。以新的假想消能領域,並用多領域邊界元素法解析波浪通過單列、雙列垂直翼板的反射率、透過率及能量損失,再次與水工模型試驗資料做比對,發現會更接近試驗值,可以提供數值模擬上的參考。 |
英文摘要 | A normal incident wave interacting with vertical curtain-wall breakwater results in the formation of a vortex subsequently shedding from the sharp edge of a zero thickness breakwater. These vortices can cause significant energy dissipation, but using the potential theory for wave scattering tends to over-predict the results because no wave energy dissipation is included. With regard this kind of information, it appears that to date, the number of references published results for curtain-wall breakwater case is fewer. Nakamura and Ide (1997) presented the designed hypothetical dissipation domains which located L/8 (L denotes the wavelength) front and back to the curtain-wall breakwaters, however, the reflection coefficient of their model results were slightly smaller than the experiments. In order to make the simulation closer to the experiments, we improve the designed hypothetical dissipation domains, only the seaward height from the bottom of the curtain-wall breakwaters to the seabed, where a dissipation coefficient value f_v = 0.15 is used. The multi-domain boundary element method (MBEM) is applied to simulate of hydrodynamic performance of vertical curtain-wall breakwater. The numerical calculation of the present model shows, using a new hypothetical dissipation domain, good agreement with experimental results. It is shown that the present numerical model is capable of simulating wave-induced vortices. The present study can serve as a way to simulate the hydrodynamic performance of curtain-wall breakwater. The results presented here should be found useful in the design of harbor and ocean engineering. |
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