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| 題 名 | Tracking of the Yield Surfaces of Laminar Viscoplastic Flows in Noncircular Ducts Using an Adaptive Scheme=以可變網格法決定黏塑性流體在非圓管內穩流之降服面 |
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| 作 者 | 王曄; | 書刊名 | Proceedings of the National Science Council : Part A, Physical Science and Engineering |
| 卷 期 | 23:2 1999.03[民88.03] |
| 頁 次 | 頁311-318 |
| 分類號 | 460.02 |
| 關鍵詞 | 可變網格法; 黏塑性流體; 降服界面; Bingham plastic fluids; Yield surface; Finite element analysis; Adaptive refinement; |
| 語 文 | 英文(English) |
| 中文摘要 | 本研究係應用變分不等式於有限元素之賓漢塑性流體流動分析,並由常態化方法 及可變網格法決定未降服栓狀區之界面。剪速率張量之第二不變量可視為有限元素分析之局 部誤差。 然而由於 von Mises 之降服標準,此第二不變量在降服界面會呈現不連續。因此 吾人需要另外之總體誤差量以作為停止網格細分之標準。本研究提出合理之網格細分標準及 細分程序以解決可變網格自動化時所遭遇之問題。 |
| 英文摘要 | The duct flow of Binghma plastic fluids is analyzed using the variational inequality based finite-element method. The problem of tracking the yield surface is solvable using the regularization technique in combination with an adaptive scheme which can be easily incorporated into the existing finite element code. The second invariant of the shear rate tensor may be used for local error estimation in finite element analysis. However, the second invariant will undergo a discontinuity at the plug boundary, as a result of the imposition of the von Mises' yield criterion. The ensuing error will always be sensed during the iterative process. Unless we stop refinement according to some global error measures, it will go on forever. In this paper, we present the appropriate refinement indicators and refinement strategies which allow us to overcome these difficulties in the automation of adaptive refinement. |
本系統中英文摘要資訊取自各篇刊載內容。