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題 名 | 以分子動力學模擬微觀孔穴流之流場=Microscopic Driven Cavity Flow Simulation by Molecular Dynamics Method |
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作 者 | 鄧志浩; 周彥博; | 書刊名 | 中原學報 |
卷 期 | 30:3 2002.09[民91.09] |
頁 次 | 頁311-321 |
分類號 | 440.137 |
關鍵詞 | 分子動力學; 微機電系統; 有效勢能函數; 孔穴流; Molecular dynamics; MEMS; Effective potential function; Driven-cavity flow; |
語 文 | 中文(Chinese) |
中文摘要 | 在巨觀或微觀站在體力學中,孔穴流(Driven-Cavityf1ow)流場的分佈為傳統計算流體力學中研究分析的基本問題,孔穴流體的流動因為邊界幾何形狀,在系統中央會出現一個巨大渦流,若系統雷諾數夠大時,也有可能會出現數個大小不一的渦流等。但是在極微小的環境下,以巨觀方式所求解Navier-Stokes方程式之數值解往往變得不適合及產生明顯之誤差。在微觀下求解微機電系統流場(MEMSf1ows),利用分子動力學的方法,可以有效模擬極微小環境下流體流動的現象。本篇文章的主旨是利用分子動力學的觀念來模擬微觀中三維孔穴流流場的現象。本研究直接利用有效勢能函數模擬微觀下孔穴流流場現象,並與使用固定粒子邊界所模擬的孔穴流相關研究做比較。此外,本研究也能有效地模擬平板移動方向與孔穴的幾何邊界非為垂直而呈若干角度變化的流場,以巨觀方式求得的數值解可能會因為孔穴的幾何情形而有奇異點的產生。本研究利用分子動力學可以有效地來處理相關的問題,並討論微觀中孔穴流特殊的流況與現象。 |
英文摘要 | The study of driven cavity flow by numerical method is one of the fundamental problems incomputational fluid dynamics from macroscopic or microscopic viewpoints. In the macroscopic viewpoint, the special distribution of vortex in center and corners of the box is associated with the variation of Reynolds numbers. In microscopic viewpoint, the simulation of cavity flow cannot beprocessed by solving the Navier-Stokes equations, in this study we adapt the molecular dynamics method (MD) to reproduce the simulation for the macroscopic fluid problems. The purpose of this study is to investigate the three-dimensional driven-cavity flow by MD method with the driven forces in the direction of normal and oblique to the boundary wal1. The application of effective potential function is included in the MD simulation for replacing the fixed molecules as the boundary walls. The detail simulation results of themicro-driven cavity flows are investigated and discussed in this study. The molecular dynamic method can effectively simulate this three-dimensional micro-driven cavity flows. |
本系統中英文摘要資訊取自各篇刊載內容。