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題名 | 補綴型網格流場數值模擬軟體研發與驗證=The Development and Validation of an Innovative Numerical Flow Field Simulation Code with Patch Grid Technology |
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作 者 | 林恆; 李予真; | 書刊名 | 新新科技年刊 |
卷期 | 3 2007.01[民96.01] |
頁次 | 頁65-77 |
分類號 | 447.55 |
關鍵詞 | 計算流體力學; 數值方法; 空氣動力學; 可壓縮流體力學; 補綴型網格; Computational fluid dynamics; CFD; Numerical algorithm; Aerodynamics; Compressible flow; Patch grid; |
語文 | 中文(Chinese) |
中文摘要 | 對於外形較為複雜的物體,製作多區塊結構性網格常遭逢下列困難:1.若外形有多處幾何轉折,網格數常因局部加密需求導致總網格數大幅增加。2.某些案倒不易獲得良好網格拓樸導致網格品質不佳,補綴式網格(patch grid)將明顯改善上述兩項困難。本文發展之計算方法脫胎於重疊式網格法,不刻意考量補綴邊界面上之守恆性,雖較缺乏數理嚴密性,但在工程使用上更趨實用。但由七個不同馬赫數測試測試案例計算結果,顯示只要網格分佈大致平順以及避免補綴型網格邊界面太接近流場急劇變化位置,縱使補綴邊界接近壁面,仍不會明顯產生計算精度下降及收斂性不佳問題。顯著之效益為減少總網格數及簡化網格製作,以工程應用角度將對本院日後進行流場分析工作有明顯助益。 |
英文摘要 | For objects of complicate geometry configuration, obstacles are often met when applying multi-block structured grid system: (1) if several geometry swerves present, grid number will be increased drastically by the need for increasing grid density locally (2) in some cases, grid quality is degraded due to poor grid topology. Patch grid system will tackle the obstacles stated above enormously. Though lack of sound theoretical rigidity due to non-conservation flux across the patch boundary, the grid system illustrated in this paper evolved from overlapped mesh technique is more practical from the engineering application standpoint. For the seven test cases of different Mach number showed, as long as the grid distribution is smooth and keeping the patch border from too close to the vicinity of drastically varied flow field, even the patched boundary is near the wall, numerical accuracy and iterative convergence drop through will not occurred vividly. From the engineering application aspect, simplification of grid generation and decreasing of total grid numbers will be beneficial to the afterward flow field analysis. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。