利用流體體積法之雙流體計算

Abstract

在雙流體之研究中，在模擬流場時兩不互溶流體之自由液面的位置與形狀難以去確認。本研究之目的為以流體體積法及混合策略建立一模擬架構，且不需經由以重建自由液面之方式，以期能保持自由液面形狀之明確性並符合流場中之邊界性。而流場中自由液面之運動乃經由求解一傳輸方程式所得。更進一步地，在模擬架構建立之後，將與前 人所發展之方法比較，如Muzaferija 提出之HRIC 法、Ubbink 提出之CICSAM 法、以及Dariwish 所提出之STACS 法。另外，此架構將應用在一些案例，並與實驗成果及前人數值模擬之結果作比較

In two fluid flow investigation, the simulation of flows with free surfaces is difficult because neither the shape nor the position of the interface can be identifies in advance between two immiscible fluids. The aim of this study is to develop a scheme, which ensures the preservation of the sharpness and the shape of the interface while retaining boundedness of the field, by volume tracking method and blending strategy without explicit interface reconstruction. The motion of the interface is tracked by the solution of a transport equation for a phase-indicator field. Furthermore, this scheme is formed and compared with the well-known HRIC, CICSAM and STACS schemes. Some favorable cases are simulated and comparisons are made in the literature.