喇叭型溢洪道為水庫排洪結構物的一種，一般而言設計流量主要為自由溢流的狀況。然而，受到溫室效應、氣象異常、流域逕流的改變等可能造成實際上的流量比設計排水量高，因此，為確保溢洪道是在安全的排水狀況下，瞭解各階段的流場狀況有其必要性。本研究使用泛用計算流體力學軟體模擬本研究室現有的喇叭型溢洪道壓克力模型，藉由軟體模擬瞭解浸沒與非浸沒及有無導流板之不同狀況下流場流動狀況。
由模擬的結果可以得知，FLUENT可以模擬出浸沒與非浸沒之流場，在非浸沒的情況下，自由溢流之流場皆呈對稱性，在浸沒的情況下，無導流板之流場並不呈對稱，流場主要為一漩渦，而導流板會將渦度集中在周圍。模擬結果得知，在滿管流時，有導流板的情況下，不但能避免進水口漩渦的產生，也降低進入進水口之流速，導流板確實能降低渦流對進水口的影響。

The Morning-Glory spillway is a kind of structure for flood expellent of the reservoir. In general, the free overflow is the main flow condition of the spillway. Consequently, the free flow over the spillway is well understood, but knowledge about submerged flow is generally relatively poor. However, the greenhouse effect cause unusual climate, and therefore change the basin runoff. So, may cause the spillway’s flow condition became submerged flow. In order to ensure the spillway is under the safe draining water condition, understanding various stage of the spillway is necessity. In this study we use commercial computation hydromechanics software to simulate the behavior of flow over a acrylic Morning-Glory spillway model in the laboratory. The results display flow over the spillway free overflow is better than submerged flow, and the antivortex board can reduce the vortex influence on spillway especially in submerged flow.

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