• 作者： 洪儒珍; 潘海林
• 作者服務機構： 美國阿拉巴馬大學機械與航太工程學系
• 中文摘要： 三維全滿柱型液箱在不同方向重力加速度下，由靜止開始轉動增速之瞬時流動狀態作了模擬研究。對暫時回流區及艾克曼層由靜止衝擊起動加速後，以至形成固體轉動前之起始，發展和消退過程之狀況特加研討。這些流動發展過程和流動雷諾數，網格點大小與流動計算時所產生之數字不穩定關係亦做了詳盡研討。本文尤其對重力加速度斜向作用於柱型轉動液箱時，所形成三維瞬時複雜流動狀態做了研討。
• 英文摘要： Three-dimensional transient flow profiles of spin-up in a fully liquid-filled cylinder from rest withgravity acceleration'at various directions have been numerically simulated and studied. Of particular interestare the development of temporary reverse flow zones and the Ekman layer right after the impulsive startof spin-up from rest, and decay before the flow reaches solid rotation. The relationship of these flowdevelopments and the differences in the Reynolds numbers of the flow and the size selection of grid pointsconcerning the numerical instabilities of flow computations are also discussed. In addition to thegravitational acceleration along the axial direction of a cylindrical container, a series of complicated flowprofiles accompanied by three-dimensional transient flows-with oblique gravitational acceleration has beenstudied.
• 中文關鍵字： spin-up motion; three dimensional transient flow; Ekman layer boundary layer; impulsive motion
• 英文關鍵字： --