隔間水槽阻尼器（Partitioned Tank Damper,PTD）為一矩形水槽中央垂直設置具有固定開度隔板的液體阻尼器。為了分析方便，兩槽液面加入兩單自由度活塞運動的浮蓋板。本文著重於研究PTD的活塞式蓋板作上下簡諧運動時，內部液體的動壓力分佈。
本文以數值模擬方式研究PTD內部壓力問題。數值方法採用貼壁座標格網，流場方程式推導為流函數-渦度模式，以有限解析法離散，求解內部流場的流函數、渦度及壓力等變數，並使用對角矩陣法與超鬆弛收斂法加快計算速度。使用均勻流通過圓柱問題作為模式測試工具，檢驗流場與壓力的精確性。
數值計算結果之驗證，採用均勻流通過圓柱模式測試。流函數測試結果大致與前人實驗照片結果吻合。壓力計算方面，本文測試不同控制方程式與不同邊界條件，並繪出所計算之圓柱表面壓力係數結果，並由圓柱各角度的Q值剖面線，檢查流場渦度與Q值之關係。由於使用不同理論獲致結果有很大差異，本文僅列出這些比較結果，以供後續研究參考。
PTD內部流場問題，先不考慮黏性進行計算，並討論PTD內部在不同時間的壓力分佈。依照外力平衡的觀點，檢驗壓力梯度（即作用力）與流體慣性力之平衡關係。至於考慮流體黏性之計算，先討論流函數、渦度的計算結果，並依上述圓柱流方式進行結果分析，並列出不同計算條件之結果，以供後續研究參考。

Partitioned Tank Damper (PTD) is a rectangular liquid tank damper equipped with a fixed opening partition board in the middle. In order to analyse this damper system conveniently, we put two single degree additional piston-typed plates floating freely on the liquid surface of the tank. This thesis attempts to investigate the distribution of hydrodynamic pressure on the PTD walls by numerical analysis.
This thesis utilizes numerical matched to analyse the hydrodynamic pressure inside a PTD. The numerical model is based on the stream function and vorticity formulation, and is treated by the finite analytic discretization method in a transient boundary fitted coordinate system. The stream function, vorticity and pressure are solved by tridiagonal matrix algorithm. In order to accelerate the convergent rate of numerical solution, the successive over-relaxation technique is also applied.
For the numerical validation, we first test the problem of a uniform flow passing a fixed circular cylinder at Re=26. The result of the calculated streamline is consistent well with the observation in other’s experiment. On the calculated pressure field, this study testifies various governing equations and boundary condition to illustrate their results of the surface pressure coefficients. It is found that these results obtained from different methods have large deviation among one another. The justification within these results is rather difficult in the present study to make a definite suggestion, but, instead, more future investigations are necessarily requested for this goal.
For the PTD flow field, this thesis first presents inviscid flow solution of evolved pressure distribution. To follow the force-momentum law, the relation of calculated pressure gradient (i.e., pressure force) balanced with the inertia of fluid is also checked. For viscous flow calculation, the results of streamlines, vorticity and pressure are discussed. As discussed in the circular cylinder flow, the present study just lies different calculated results of pressure field hopefully as references for continued researches without further recommendations.

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