管道中裝有振動防倒流器其流通數值之研究

Numerical Study of Flow in a Duct with Oscillating Backflow Preventer

柯亭帆(TIENFUAN KERH)

《台灣水利》 43卷2期 (1995/06) Pp. 85-90+36

https://doi.org/10.6937/TWC.199506_43(2).0008

摘要

本文旨在探討黏性流體通過一倒流防制器所產生交互作用現象。在流體方面是採用一致性罰制函數有限元素法來將其運動方程式模式化，在固體方面則以紐馬克趨近法來求解其平衡方程式，而在流體與固體相交之邊界條件是取符合性之限制爲原則。從計算結果顯示，結構系統的運動變成可移動之邊界，因而很明顯地影響到整個流場。對於一穩定之入口流而言，結構體可因流體力量之作用而平衡於一新位置，所以在有足够長之時間，結構系統與流體之運動可分別趨近於穩態之反應，這些反應之結果可使對交互聯結控制應用的領域有一適度之了解。

關鍵字

振動 ； 倒流防制器 ； 移動邊界 ； 交互作用

並列摘要

The purpose of this paper is to investigate viscous incompressible fluid interaction with an oscillating backflow preventer. The consistent penalty function finite element method is employed to model the governing equations for the fluid, and the Newmark approach is used to solve the equilibrium equation for the structural system. The boundary conditions for the interfaces between fluid and solid are set for satisfying the compatibility constraints. From the computational results, it is observed that motion of the structural element which becomes a moving boundry had an influence on the flow fields significantly. In a steady inlet flow, the structural system can be balanced by the fluid force, steady-state responses for both structural system and fluid are then reached for a sufficiently long time. These responses may provide insight of the application in the cross-connection control field.

並列關鍵字

Oscillating ； Backflow preventer ； Moving boundary ； Interaction