查詢結果分析
來源資料
相關文獻
- Numerical Study of Bathymetry Effect on Vortex Shedding
- Numerical Studies of Bathymetry Effects on Waves Deformation Using Shallow Water Equation
- p-Version Space-Time Least-Squares Finite-Element Method for Shallow-Water Equations
- Application of High-Order Least-Squares Finite-Element Method for Second-Order Partial Differential Equations
- Comparison of Least-squares Finite-element Method and Pressure-correction Finite-volume Method for Three-dimensional Lid-driven Cavity Flow at Reynolds Number 100
- Some Nonlinear Applications Related to the Adaptive Least-squares Finite Element Method
- 利用半球淺水方程式模式研究東亞寒潮爆發與行星波之關係
- 二相流模式研究自由液面流在不規則底床運行之現象
- 應用平行運算於二維潰壩之模擬
- Conservative Semi-Lagrangian Scheme Applied to One-Dimensional Shallow Water Equations
頁籤選單縮合
題名 | Numerical Study of Bathymetry Effect on Vortex Shedding=地形水深對渦流射出影響之數值研究 |
---|---|
作者 | 梁興杰; 何宗儒; | 書刊名 | 海洋工程學刊 |
卷期 | 8:2 2008.12[民97.12] |
頁次 | 頁153-168 |
分類號 | 440.137 |
關鍵詞 | 淺水方程式; 卡門渦街; 最小平方有限元素法; θ-方法; Shallow-water equations; Vortex streets; Least-squares finite-element method; θ-method; |
語文 | 英文(English) |
中文摘要 | 本文中,我們利用數值模式,探討地形水深對渦流射出之影響。數值模式係使用空間最小平方有限元素法與θ-時間積分方法,求解非守恆形式之二維水深平均淺水方程式。我們考慮相同邊界條件與起始條件情況下,三種不同地形(包括:水平地形、傾斜地形、與不規則地形),水流流經一圓柱之流況,探討圓柱周圍之水面變化與渦街之動態特性。計算結果與實驗數據及其他數值解相當吻合。結果顯示在對稱於水流方向之地形情況下,卡門渦街是對稱、且一對一對以順時鐘與反時鐘之渦流交替出現;而在不對稱於水流方向之地形情況下,卡門渦街是不對稱、且一對一對以順時鐘與反時鐘之渦流交替出現。由此可見,地形水深對渦流之形成、強度、與變化有關,而且會影響到圓柱周圍及上游之流場。 |
英文摘要 | The effect of bathymetry on the characteristics of vortex streets is numerically studied in this paper. The numerical model is based on the non-conservative, two-dimensional depth-averaged shallow-water equations with the least-squares finite-element formulation in space and θ-method in time integration. Flow past a circular cylinder with the same boundary and initial conditions, in three different bathymetries, including the horizontal bed, constant slope bed, and irregular bed, is investigated. Water surface around the cylinder and the dynamics of the vortex streets are examined. Computed results compared well with available experiment data and other numerical solutions. It shows that pairs of symmetric, alternatively cyclonic-anticyclonic vortices are found in the symmetric bathymetry setting, and highly asymmetric, alternating vortices with opposite rotations in the non-symmetric bathymetry setting. The bathymetry has a direct effect on the formation, strength, and characteristics of the vortex shedding, and consequently on the water surface around the cylinder and flow field upstream. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。