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題 名 | 初始流場對引用SMAC方法模擬水躍之影響 |
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作 者 | 施清吉; | 書刊名 | 農業工程學報 |
卷 期 | 41:3 1995.09[民84.09] |
頁 次 | 頁1-13 |
分類號 | 443.1 |
關鍵詞 | 自由面; 水躍; SMAC方法; 流動模擬; Free surface; Hydraulic jump; SMAC method; Flows nulation; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究使用SMAC方法模樣水躍,採用三種不同型別的初始流暢:空晶格無下游洩水閘門,空晶格並配合一下游洩水閘門與空晶格但有一下游初始水深。模擬結果是針對水躍本體深度之探討,前兩者不易造成淹沒流,只適宜模擬流經一緩坡的超臨界流,不適宜模擬水躍。而後者卻適用於水躍,可是較理想的適用範圍為上游福祿數須介於3.9至5.5之間。一般而言,SMAC方法模擬之水躍剖面均較偏低,這可能因本研究只使用較簡單的阻力模式,且以單一摩擦因子(f = 0.03)代表渠底阻力,無法反映水躍機構。SMAC方法所展示的顆粒分佈顯示此方法極適宜模擬自由面急劇變化的流況。 |
英文摘要 | The method of SMAC (Simple Marker and Cell) is utilized to simulate a hydraulic jump, and three different types of the initial flow field are: (1) empty without a downstream sluice gate, (2) empty with a downstream sluice gate, and (3) not empty but with a downstream depth which is different form the given upstream depth. The first two types of the initial flow are not apt to result in a submerged flow, which are suitable to simulate a supercritical flow over a mild slope and but not appropriate for simulating a hydraulic jump; while one will eventually end up a submerged flow and is applicable to simulate a hydraulic jump in a reasonable range approximately from 3.9 to 5.5 of the upstream Froude number. Generally speaking, the water surface profile as predicted by the present investigation is mostly lower than that obtained by various investigators, such as Subramanys, the discrepancy of which could be possibly due to over simplified resistance equations as used in this study. A moderate value of the friction factor f, such as 0.03, can not reflect the main characteristics of the hydraulic jump. However, the distribution and the spread of markers do show that this schema is good for simulating flows with a rapid change in the free surface. |
本系統中英文摘要資訊取自各篇刊載內容。