Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/16581
標題: 孤立波通過潛沒矩柱之周邊二維流場特性探討
Study on the Characteristics of Two-dimensional Flow Fields around a Submerged Rectangular Cylinder by a Solitary Wave
作者: 紀明志
Ji, Ming-Jhih
關鍵字: Solitary wave
孤立波
Submerged rectangular cylinder
矩柱
渦流
出版社: 土木工程學系所
引用: 1.Daily, J. W., and Stephan, S. C. (1953) “Characteristics of the Solitary Wave.” Transaction of ASCE, 118. 2.Huang, C. J., and Dong, C. M. (2001). “The Interaction of a Solitary Wave and a Submerged Dike.” Coastal Engineering, 43, 265-286. 3.Mori, N and K. A. Chang, “Introduction to MPIV,” PIV toolbox in MATLAB, version 0.95, pp.1-13 (2003) 4.Lin, C., Ho, T. C., Chang, S. C., Hsieh, S. C., and Chang, K. A. (2005). “Vortex Shedding Induced by a Solitary Wave Propagating over a Submerged Vertical Plate.” International Journal of Heat and Fluid Flow, 26, 894-904. 5.陳智育 (1993):「矩形柱體周邊及尾流流場特性之探討」,國立中興大學土木工程研究所碩士論文。 6.林呈、顏光輝、郭正雄 (1995):「矩形柱體尾流場組織結構之實驗研究」,中國土木水利工程學刊,第七卷,第二期,第199-213頁 (1995)。 7.白佳燕 (2003):「應用FLDV與PIV探討並列鈍形體尾流場之特性」,國立中興大學土木工程研究所碩士論文。 8.許泰文 (2003):近岸水動力學,科技圖書,台北,第41頁。 9.張淞傑 (2004):「應用流場可視化與PIV技術於孤立波通過淺堤周邊渦流流場之研究」,國立中興大學土木工程研究所碩士論文。 10.林呈、謝世圳、高明哲、徐華勇 (2004):「應用FLDV與PIV同步量測技術於圓柱近域尾流平均速度場特性之探討」,中國土木水利工程學刊,第16卷,第1號,第80-98頁 (2004)。 11.鄭英民 (2005):「矩形柱體周邊分離流流場特性實驗之探討」,國立中興大學土木工程研究所碩士論文。 12.程文泰 (2007):「孤立波通過潛沒圓柱之周邊流場特性研究」,國立中興大學土木工程研究所碩士論文。 13.余詩敏 (2008):「孤立波底床邊界層之流場特性探討」,國立中興大學土木工程研究所碩士論文。 14.謝世圳 (2008):「單圓柱尾流流場特性之實驗研究」,國立中興大學土木工程研究所博士論文。 15.何宗浚 (2009):「孤立波通過長高比之潛沒構造物時周邊渦流流場特性探討」,國立中興大學土木工程研究所博士論文。 16.張正侑、蕭士俊、吳昀達 (2010) 「孤立波通過孔隙薄板之數值研究」,第32屆海洋工程研討會論文集 pp. 267 ~ 272。 17.吳昀達、蕭士俊 (2010) 「RANS模式應用孤立波與一潛沒式垂直板之互制分析」,第32屆海洋工程研討會論文集 pp. 243 ~ 248。
摘要: 本研究應用具備高時間解析之PIV速度量測系統,輔以流場可視化相片以探討孤立波通過二維水平配置之矩柱之周邊流場特性。文中首先針對不同實驗間距條件下之孤立波通過矩柱上方所引致之流場型態定性觀察,並依據其結果將流場進行特性分類彙整。經流場彙整後,大致可分為四種模態:(1) G/D = 0潛堤模態;(2) G/D = 1 ~ 2矩柱接近底床邊界模態;(3) G/D = 3 ~ 4矩柱位於中間段之模態;(4) G/D = 5 ~ 6矩柱接近自由液面之模態。 在不同矩柱至底床距離之實驗條件下,都可發現柱體後方所產生的尾流都以順時針渦流為最大(本實驗觀察孤立波於水槽中行進方向為左至右)。當實驗條件G/D越小時,表示矩柱體離水面越遠,當孤立波波峰通過後,渦流產生最大之環流量時間將會提前,當G/D越大時,則渦流發展至最大環流量時間將延後。當矩柱位於中間水深(G/D =3)時,會產生該水深之最大渦流環流量。
The characteristics of the vortices induced by a solitary wave propagating over a submerged 2-D rectangular cylinder were investigated experimentally. The wave height (H) is 2.0 cm in the water depth of h = 7 cm, and rectangle cylinder height (D) is 1 cm with a width of 3.0 cm. Particle image velocimetry (PIV) and flow visualization techniques were used for the experiments. PIV was based on phantom camera and Argon laser system. Particle trajectory photography was used to observe the flow patterns. The vortex shedding processes were investigated for different gap rations (G/D) using the qualitative visualization technique and PIV. For different G/D, the flow patterns can be classified as four major flow patterns. For G/D = 0, the characteristics of flow field are similar to that around a submerged dike. For G/D = 1 ~ 2, the vortex shedding process is nearly the same. As a solitary wave passes, two asymmetric vortices are produced behind rectangular cylinder. As the wave moves away from the position over the rectangular cylinder, the vortices move up toward the water suface. For G/D = 3 ~ 4, the vortices move horizontally toward the incoming direction of the solitary wave. For G/D = 5 ~ 6, the vortex shedding process is different from those of G/D = 3 ~ 4. The vortices are influenced by the passing of solitary wave-peak, the vortices move toward the bottom boundary. For these different G/D, the rectangular cylinder wake have three vortices adjacently. The rotation of vortox is clockwise, and this clockwise vortex circulation is larger than other vortices at each non-dimensional time (T = -1.5 ~ 18).
URI: http://hdl.handle.net/11455/16581
其他識別: U0005-2708201116484400
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2708201116484400
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