查詢結果分析
來源資料
頁籤選單縮合
| 題 名 | 突擴管流場之數值模擬=Numerical Simulation of Abrupt Expansion Pipe Flow |
|---|---|
| 作 者 | 廖清標; 胡文海; | 書刊名 | 逢甲學報 |
| 卷 期 | 29 1996.06[民85.06] |
| 頁 次 | 頁145-158 |
| 分類號 | 440.137 |
| 關鍵詞 | 非定常性; 投影法; 快速富利葉轉換; 再接觸長度; Unsteady; Projection method; Fast fourier transformation; Reattachment length; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本文以數值計算方法求解軸對稱之非定常性Navier-Stokes 方程式,探討在流體 流經軸對稱突擴管流之流場結構。數值方法以顯式有限差分法將控制方程式寫作差分 方程式,以投影法導出壓力的Poisson 方程式,替代連續方程式,使其自動滿足而無需 求解。壓力方程式以快速富利葉轉換配合三對角線矩陣系統直接解出,不需疊代過 程,既快速又準確。初步的計算結果顯示,突擴管流中重要的無因次長度--再接觸長 度,與前人的研究結果相當吻合,證明了在已到達穩定的流場中之無因次再接觸長 度,在層流範圍內,乃隨雷諾數的提高而成線性增加。 |
| 英文摘要 | A numerical investigation is performed for the flow field structure over an axisymmetric aburpt expansion pipe by sloving axisymmetric unsteady Navier-Stokes equations. The system of governing equations are written on discrete forms by method of explicit finite-difference scheme. By applying the projection method to obtain the pressure Possion's equation, the equation of continuity satisfy automatically. The pressure equation can be sloved directly by using fast Fourier transformation and tridiagonal matrix system without iterating procedures. Preliminary computational results in dimensionless reattachment length are in good agreement with other reference. In present study, it is proved that the dimensionless reattachment length increases linearly as Reynolds number increases in laminar flow regime. |
本系統中英文摘要資訊取自各篇刊載內容。