振動翼之流體動力分析

The Analysis of Hydrodynamic Forces of Oscillating Foils

連昱揚(Yi-Yang Lien)

指導教授 ： 邱逢琛

國立臺灣大學/工學院/工程科學及海洋工程學研究所/碩士(2008年)

https://doi.org/10.6342/NTU.2008.01846

摘要

本研究應用計算流體力學套裝軟體Fluent進行二維振動翼的流體動力分析，探討仿魚類尾鰭推進的力學機制。利用Fluent進行計算是以動態網格進行非穩態流場模擬，先以純起伏運動之結果與勢流理論小板法及Theodorson的二維薄翼振動解析解進行交叉比較，以驗證本方法的正確性。其次，本研究進行二維振動翼起伏與縱搖耦合運動下的非穩態流場計算，所得推力係數、功率係數及推進效率之系列數值計算結果與勢流理論小板法以及Triantafyllou論文之實驗結果進行比較，確認本研究計算之有效性。在此基礎上，期望後續能進行串列雙振動翼流場交互作用之數值計算分析，以作為開發仿生助推器之分析工具。

關鍵字

CFD ； 流體動力 ； 振動翼

並列摘要

Present study is focused on the numerical calculation of hydrodynamic forces of an oscillating foil in order to clarify the propulsion mechanism of the fish caudal fin. The CFD software package of FLUENT is applied to simulate the unsteady two-dimensional flow field of a reciprocating heaving and heave-pitch coupled foil of a NACA0012 section with forward speed. The lift coefficients at varied heave frequencies are obtained and compared with those obtained by Panel Method and Theodorson’s function, which are potential flow based numerical solution and analytic solution respectively.
Furthermore, the results of the thrust coefficient, power coefficient and propulsive efficiency in heave-pitch coupled motion are also compared with Panel Method and the experimental value of Triantafyllou. The final goal of the present CFD simulation is to carry out parametric study on the flow field and hydrodynamic forces of a bio-mimetic booster which is composed of two oscillating foils in series.

並列關鍵字

CFD ； hydrodynamic force, ； oscillating foil

參考文獻

[1] 吳昌政 (2004) "振動翼流體動力時域計算法之研究"，國立台灣大學論文。

[3] 蔡旻育 (2007) "水下滑翔機之流體動力分析"，國立台灣大學論文。

[4] Triantafyllou, G.S., M.A. Grosenbaugh & M.S. Triantafyllou (1993) “Optimal thrust development in oscillating foils with application to fish propulsion,” Journal of Fluid Mechanics 7,205~224.

[5] Videv, Todor A., Yasuaki Doi & Kazu-hiro Mori (1993) “Numerical Study of Flow and Thrust Produced by Heaving and Combined Oscillations of 2D Hydrofoil,” Faculty of Engineering, Hiroshima University.

[6] Anderson J.M., K. Streitlien., D.S. Barrett, & M.S. Triantafyllou (1998) “Oscillating foils of high propulsive efficiency,” Journal of Fluid Mechanics 360,41~72.