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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 朱錦洲(Chin-Chou Chu) | |
dc.contributor.author | Wei-Ning Hsu | en |
dc.contributor.author | 徐偉甯 | zh_TW |
dc.date.accessioned | 2023-03-19T22:29:07Z | - |
dc.date.copyright | 2022-08-30 | |
dc.date.issued | 2022 | |
dc.date.submitted | 2022-08-29 | |
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P., Mathew, G., & Weston, A. 1989 Flow past short circular cylinders with two free ends. Journal of Fluid Mechanics, 203, 557-575, [26] Park, J., Kwon, K., & Choi, H. 1998 Numerical solutions of flow past a circular cylinder at Reynolds numbers up to 160. KSME International Journal, 12(6), 1200-1205, [27] Sen, S., Mittal, S., & Biswas, G. 2009 Steady separated flow past a circular cylinder at low Reynolds numbers. Journal of Fluid Mechanics, 620, 89-119, [28] Singha, S. S., K. P. 2010 Flow past a circular cylinder between parallel walls at low Reynolds numbers. Ocean Engineering, 37(8-9), 757-769, [29] Behara, S., & Mittal, S. 2010 Flow past a circular cylinder at low Reynolds number: Oblique vortex shedding. Physics of Fluids, 22(5), 054102, [30] Mittal, S. 2001 Computation of three-dimensional flows past circular cylinder of low aspect ratio. Physics of Fluids, 13(1), 177-191, [31] Wang, H. F., & Zhou, Y. 2009 The finite-length square cylinder near wake. 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K. 2006 Employing controlled vibrations to predict fluid forces on a cylinder undergoing vortex-induced vibration. Journal of Fluids and Structures, 22(6-7), 877-884, [45] Cui, Z., Zhao, M., & Teng, B. 2014 Vortex-induced vibration of two elastically coupled cylinders in side-by-side arrangement. Journal of Fluids and Structures, 44, 270-291, [46] Sarpkaya, T. 2004 A critical review of the intrinsic nature of vortex-induced vibrations. Journal of Fluids and Structures, 19(4), 389-447, [47] Navrose, Yogeswaran, V., Sen, S., & Mittal, S. 2014 Free vibrations of an elliptic cylinder at low Reynolds numbers. Journal of Fluids and Structures, 51, 55-67, [48] Samvit, K., Navrose., & Mittal, S. 2016 Lock-in in forced vibration of a circular cylinder. Physics of Fluids, 28(11), 113605, [49] Blackburn, H. M., & Henderson, R. D. 1999 A study of two-dimensional flow past an oscillating cylinder. J. Fluid Mech, 385, 255-286, [50] Sarpkaya, T. 1978 Fluid forces on oscillating cylinders. NASA STI/Recon Technical Report A, 104, 275, [51] Carberry, J., Sheridan, J., & Rockwell, D. 2005 Controlled oscillations of a cylinder: forces and wake modes. Journal of Fluid Mechanics, 538(-1), 31, [52] Gopalkrishnan, R. 1993 Vortex-Induced Forces on Oscillating Bluff Cylinders, [53] Ongoren, A., & Rockwell, D. 1988 Flow structure from an oscillating cylinder Part 1. Mechanisms of phase shift and recovery in the near wake. Journal of Fluid Mechanics, 191(-1), 197, [54] Zdravkovich, M. M. 1982 Modification of Vortex Shedding in the Synchronization Range. Journal of Fluids Engineering, 104(4), 513-517, [55] Koopmann, G. H. 1967 The vortex wakes of vibrating cylinders at low Reynolds numbers. Journal of Fluid Mechanics, 28(03), 501, [56] Williamson, C. H. K., & Roshko, A. 1988 Vortex formation in the wake of an oscillating cylinder. Journal of Fluids and Structures, 2(4), 355-381, [57] Gu, W., Chyu, C., & Rockwell, D. 1994 Timing of vortex formation from an oscillating cylinder. Physics of Fluids, 6(11), 3677-3682, [58] Parnaudeau, P., Carlier, J., Heitz, D., & Lamballais, E. 2008 Experimental and numerical studies of the flow over a circular cylinder at Reynolds number 3900. Physics of Fluids, 20(8), 085101, [59] Jiang, H., & Cheng, L. 2021 Large-eddy simulation of flow past a circular cylinder for Reynolds numbers 400 to 3900. Physics of Fluids, 33(3), 034119, [60] Rastan, M. R., & Alam, M. M. 2021 Transition of wake flows past two circular or square cylinders in tandem. Physics of Fluids, 33(8), 081705, [61] Okoye, O. C., & Bolaji, B. O. (2020). Physics of fluid motion. In (pp. 1-22). Elsevier [62] 楊適壕. 2007 多體力源理論及其應用 (Publication Number 2007年), 國立臺灣大學. AiritiLibrary. [63] Grundmann, R., & Posdziech, O. 2001 Numerical Simulation of the Flow Around an Infinitely Long Circular Cylinder in the Transition Regime. Theoretical and Computational Fluid Dynamics, 15(2), 121-141, [64] Kravchenko, A. 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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/84853 | - |
dc.description.abstract | 本論文係利用數值模擬與實驗方法探討在低雷諾數均勻流中作簡諧振盪之有限長圓柱的流場行為。研究的雷諾數的定義為Re=ρUL/μ,物理意義是流體的慣性力與黏滯力的比值,範圍介於70~500,其中為流體密度,U為流體速度,D為圓柱直徑,μ為動力黏滯係數(Dynamic Viscosity)。數值計算使用商用軟體Ansys Fluent進行流場模擬;而實驗在拖曳式甘油槽中進行PIV(Particle Image Velocimetry)定量量測。 根據本研究團隊之成果(Chen12021),有限長圓柱於特定的流場條件下,由於縱向流場分離(Longitudinal Flow Separation, LFS)與橫向流場分離(Transverse Flow Separation, TFS)的交互作用下,於圓柱的二分切平面(Bisectional Cross-section Plane, BCP)上之尾流區域的流線投影會出現類源流(Source-like pattern,Chang et al.22021)的現象。本論文研究之目的,希望能界定出有限長圓柱尾流區域會出現類源流現象之參數條件。 數值計算的參數範圍如下: Re=70~500;圓柱長與直徑比,AR (Aspect Ratio),分別為1.5、2、3、4、5;圓柱橫向振幅A/D=0.4;圓柱振盪之頻率在0.7~1.3倍無限長圓柱渦脫落頻率。計算之結果歸納出類源流現象出現之區域。吾人藉由源流強度(Source Strength, SS)等參數,藉以探討類源流場的特性,且修正先前研究,並以高斯球面檢驗源流中心位置的流動情形。實驗採用在甘油槽中拖曳圓柱的方式,以消除傳統水洞壁面邊界層的影響。吾人以跟隨圓柱同步平移的高速攝影機記錄流場,使用PIV技術獲得BCP上流場的瞬時速度分布及流線,並和數值模擬的結果進行比對。研究結果顯示,AR=1.5~5各圓柱在Re=90~300的範圍中皆會出現類源流的現象,皆為類線狀源流(Line-like source),其中AR=1.5與AR=5的出現範圍較小。然而AR=3與AR=4有較大的範圍出現類源流的現象。實驗與數值模擬流場比對,可以證實類源流的現象確實存在,且源流中心位置近乎相同。 | zh_TW |
dc.description.abstract | The article is to report a simple harmonic vibrational circular cylinder of finite-span in low Reynolds number flow by experiments and numerical simulations. The study is under the flow condition between Reynolds number 70~500. The definition of Reynolds number is Re=ρUL/μ, which possess the physical meaning of the ratio of inertial force to viscous force, where stands for fluid density, Ufor fluid velocity, D for the diameter of the circular cylinder, and μ for dynamic viscosity. The software used for numerical simulation is Ansys Fluent. Experiments are operated in a trailing sink. According to the results of this research team(Chen12021), due to the interactions of the Longitudinal Flow Separation(LFS) and the Transverse Flow Separation(TFS), the streamline projection on the Bisectional Cross-section Plane(BCP) (Chang et al.22021) of the finite-span circular cylinder will appear a Source-like phenomena under specific flow field conditions. The article seeks to find out the range that the source-like pattern appears in the wake region of a finite-span circular cylinder, by operating numerical simulations in the conditions of Re=70~500, and aspect ratio(AR)1.5, 2, 3, 4, 5, respectively. With the transverse amplitude of A/D=0.4, and 0.7~1.3 times of the vortex shedding frequency of infinite-span circular cylinder, summarizes the area which the source-like pattern appears. Uses parameters such as Source Strength (SS) to specify the characteristics of the source-like patterns, and corrects the mistakes in the previous study. Furthermore, examine the flow field around source center by a Gaussian spherical surface. The experiments are carried out in a trailing sink, which can eliminate the influence of the boundary layers of walls in traditional water holes. Film the flow field by a high-speed camera, then use PIV technology to depict streamlines and velocity vectors of the flow field, and compare the results with which in the numerical simulations. Source-like patterns can be found in all wake regions of AR1.5~5 cylinders, within the condition of Re=90~300. AR1.5 and AR5 cylinders have smaller range that source-like patterns appear, while AR3 and AR4 cylinders have wider. After comparing flow patterns of both numerical simulations and experiments, it can be proven that the source-like flow patterns exist, and the center of source positions come very close between them. | en |
dc.description.provenance | Made available in DSpace on 2023-03-19T22:29:07Z (GMT). No. of bitstreams: 1 U0001-2808202222502300.pdf: 24781836 bytes, checksum: 1b5fa5106105ace96ea2c803413c7d2e (MD5) Previous issue date: 2022 | en |
dc.description.tableofcontents | 誌謝 i 摘要 ii ABSTRACT iv 目錄 vi 圖目錄 ix 表目錄 xii 第 1 章 緒論 1 1.1 研究背景與動機 1 1.2 靜止有限圓柱研究文獻 2 1.3 振盪圓柱相關文獻 10 1.3.1 自激振盪圓柱相關文獻 10 1.3.2 強制振盪圓柱相關文獻 13 第 2 章 基礎理論 21 2.1 參數介紹 21 2.2 基礎公式 23 2.2.1 連續方程式 23 2.2.2 動量方程式 24 2.2.3 源流與沉流 25 第 3 章 數值方法 26 3.1 網格構造 26 3.2 網格驗證 29 3.3 邊界條件 30 3.4 動網格模型 31 3.5 數值方法 32 3.5.1 空間離散 32 3.5.2 時間離散 33 3.5.3 壓力速度耦合 35 第 4 章 實驗方法 36 4.1 實驗設備 36 4.1.1 拖曳式水槽與支撐架 36 4.1.2 機械手臂與滑軌 37 4.1.3 圓柱與吊架 39 4.1.4 實驗流體 41 4.1.5 可視化粒子 42 4.1.6 雷射光發射器 43 4.1.7 攝影器材 44 4.1.8 黏度計 45 4.2 PIV方法 45 4.2.1 PIVlab 46 4.3 實驗架設 48 第 5 章 結果與討論 50 5.1 振盪有限圓柱參數 50 5.2 數值模擬流場 50 5.2.1 AR1.5圓柱尾流BCP流線圖 53 5.2.2 AR2圓柱尾流BCP流線圖 59 5.2.3 AR3圓柱尾流BCP流線圖 67 5.2.4 AR4圓柱尾流BCP流線圖 78 5.2.5 AR5圓柱尾流BCP流線圖 91 5.3 流況分布 98 5.3.1 源流強度 102 5.3.2 源流中心距 105 5.3.3 渦流纖細度 107 5.3.4 流況分布總結 109 5.4 源流中心位置流況 110 5.5 實驗流場 113 第 6 章 結論與未來展望 123 6.1 結論 123 6.2 未來展望 124 參考文獻 125 | |
dc.language.iso | zh-TW | |
dc.title | 低雷諾數振盪有限圓柱尾流域類源流型 | zh_TW |
dc.title | Source-like pattern in the wake of Low Reynolds flow past a vibrational circular cylinder of finite-span | en |
dc.type | Thesis | |
dc.date.schoolyear | 110-2 | |
dc.description.degree | 碩士 | |
dc.contributor.coadvisor | 張建成(Chien-Cheng Chang) | |
dc.contributor.oralexamcommittee | 張家歐(Chia-Ou Chang),陳國慶(Kuo-Ching Chen),陳建甫(Chien-Fu Chen) | |
dc.subject.keyword | 有限長圓柱,低雷諾數,類源流場,振盪圓柱,圓柱尾流, | zh_TW |
dc.subject.keyword | finite-span circular cylinder,low Reynolds number,source-like pattern,vibrational circular cylinder,wake region of a cylinder, | en |
dc.relation.page | 129 | |
dc.identifier.doi | 10.6342/NTU202202900 | |
dc.rights.note | 同意授權(限校園內公開) | |
dc.date.accepted | 2022-08-29 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 應用力學研究所 | zh_TW |
dc.date.embargo-lift | 2022-08-30 | - |
顯示於系所單位: | 應用力學研究所 |
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