Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/15262
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dc.contributor黃隆明zh_TW
dc.contributor陳若華zh_TW
dc.contributor梁大慶zh_TW
dc.contributor.advisor方富民zh_TW
dc.contributor.author林得雄zh_TW
dc.contributor.authorLin, Te-Hsiungen_US
dc.contributor.other中興大學zh_TW
dc.date2007zh_TW
dc.date.accessioned2014-06-06T06:53:44Z-
dc.date.available2014-06-06T06:53:44Z-
dc.identifierU0005-0808200612194300zh_TW
dc.identifier.citation[1]Basara ,B. and Younis ,B .A . (1992) ,“Progreaa in the Prediction of Turbulent Wind Loading on Buildings ,” J. Wind Engg. And Ind. Aerod., Vol.41-44, pp.2863-2874. [2]Bearman, P. W. and Truman, D. M. (1972), “ An Investigation of the Flow Around Rectangular Cylinder ,” Aero. Quartely, Vol.23, pp.229-237. [3]Bearman, P. W., Downie, M. J., Graham, J. M. R., Obasaju, E. D. (1985)“Forces on cylinders in viscous oscillatory flow at low Keulegan-Carpenter number” J. Fluid Mech., Vol.154, pp.337-356 [4]Cherry, N. J. ,Hillier, R. and Latour, M. E. P. (1984), “Unsteady Measurements in a Separated and Reattaching Flow ,” J. Fluid Mech., Vol.144, pp.13-46. [5]E. Naudascher, J.R. Weske, B. Fey, “ Exploratory study on damping of galloping vibrations, J. Wind Engg. and Ind. Aerod. 8 (1981) 211-222. [6]Fang, Fuh-Min, Li Y. C., Chen, C. C., Chen, J. H., and Ueng, J. M. (2001), “Dynamic Responses of a Suspension Bridge with a Rectangular Cross-section,” Proceedings of the Fifth Asia-Pacific Symposium on Wind Engineering, Kyoto, Japan, pp.397-400. [7]Fang, F. M., Li Y. C., Chen C. C. and Liang, C. C. (2005), “Numerical Predictions on the Dynamic Response of a Suspension Bridge with a Trapezoidal Cross-Section,” Journal of the Chinese Institute of Engineers, 28, 2, pp. 281-291. [8]Han, T. (1989), “ Computational Analysis of Three-Dimensional Turbulent Flow around a Bluff Body in Ground Proximity ,” AIAA J. Vol.27, No.9, pp.1231-1219. [9]Hanson, T., Summers, D. M. and Wilson, C. B. (1984), “Numerical Modelling of Wind Flow Over Buildings in Two Dimensions ,” Int’l J. Numerical Methods in Fluids, Vol.4, pp.25-41. [10]Honji, H. (1981) “Streaked flow around an oscillating circular cylinder” J. Fluid Mech.,Vol107, pp.509-520 [11]Lane, J. C. and Loehrke, R. I. (1980), “ Leading Edge Separation from a Blunt Plate at Low Reynolds Number ,” J. Fluids Engg., Trans. ASME, Vol.102, pp.495-496. [12]Lu, X.Y. (2003), “ Three-Dimensional Instability of an Oscillating Viscous Flow past a Circular Cylinder ,” Applied Mathematics and Mechanics, Vol.24, pp.791-800. [13]Mathews, E. H. (1987), “ Prediction of the Wind-Generated Pressure Distribution Around Buildings ,” J. Wind Engg. and Ind. Aerod., Vol.25, pp.219-228. [14]Moffatt, H.K. (1961) “Viscous and resistive eddies near a sharp corner” Computer Methods in Applied Mechanics and Engineering, Vol.18, pp.1-18 [15]Morison, J. R., et al. (1950) “The Force Exerted by Surface Waves on Plies” Petroleum Transactions, Vol.189, pp.149-157 [16]Murakami, S. and Mochida, A. (1988), “ 3-D Numerical Simulation of Airflow around a Cubic Model by Means of the K-ε Model ,” J. Wind Engg. and Ind. Aerod., Vol.31, pp.283-303. [17]Murakami, S., Mochida, A. and Hayashi, Y. (1990), “ Examining the K-ε Model by Means of A Wind Tunnel Test and Large-Eddy Simulation of the Turbulence Structure Around A Cube ,” J. Wind Engg. and Ind. Aerod., Vol.35, pp.87-100. [18]Murakami, S., Mochida, A. and Hayashi, Y. (1995), “ On Turbulent Vortex Shedding Flow Past 2D Square Cylinder Predicted by CFD ,” J. Wind Engg. and Ind. Aerod., Vol.54/55, pp.191-211. [19]Okajima, A. (1982) “Numerical Simulation of Flow Around Rectangular Cylinders” J. Fluid Mech., Vol.123, pp.379-398 [20]Okajima, A. (1990) “Numerical Simulation of Laminar and Turbulent Flow Around Rectangular Cylinders” International Journal for Numerical Methods in Fluids, Vol33, pp.171-180 [21]Okajima, A. and Sakai, H (1992) “Numerical Simulation of Flow Rectangular Cylinders” J. Fluid Mech., Vol.15, pp.999-1012 [22]Sarpkaya, T. (1986) “Force on a circular cylinder in viscous oscillatory flow at low Keulegan-Carpenter numbers” J. Fluid Mech., Vol.165, pp.61-71 [23]Song, C.C.S. & Yuan, M. (1988) , “A weakly compressible flow model and rapid convergence methods. Journal of Fluids Engineering, 110, 4, pp.441-455. [24]Takashi, N., et al. (2003) “Aerodynamic force on a square cylinder in oscillating flow with mean velocity” J. Wind Engg. And Ind. Aerod., Vol.91, pp.199-208 [25]Williamson, C. H. K. (1985) “Sinusoidal flow relative to circular cylinders” J. Fluid Mech., Vol.155, pp.141-174 [26]Williamson, C. H. K. and Roshko, A. (1988) “Vortex formation in the wake of oscillating cylinder” J. Fluid Mech., Vol.2, pp.355-381 [27]Zheng, W. and Dalton, C. (1999) ”Numerical prediction of force on rectangular cylinders in oscillating viscous flow” J. Fluid Mech., Vol.13, pp.225-249 [28]蔡惠文 (1996) “均勻來流中二維矩柱之流場模擬”中興大學土木研究所碩士論文 [29]陳荻閎 (2004) “紊流場中二維矩柱表面風壓之特性及數值驗證” 中興大學土木研究所碩士論文zh_TW
dc.identifier.urihttp://hdl.handle.net/11455/15262-
dc.description.abstract本研究以數值計算方法,模擬二維方柱在平均流速不為零之週期性振盪來流下之鄰近紊流流場及方柱受力行為。在高雷諾數的情況下,改變週期性振盪來流之速度振幅比(AR)從0.1至0.7、Keulegan-Carpenter number (KC) 從0.5至30,以及風攻角(α = 0° 與 22.5° ),目的在探討相應紊流流場之變化及其對二維方柱受力行為之影響。 為了正確地反應出流場中既有之非恆定性與紊流特性,研究中之流場模擬採用微可壓縮流法與動力次網格模型。數值計算之結果以Morison equation為根據,運用最小平方法迴歸出相應之阻力係數、昇力係數,以及方柱受非線性振動力產生的慣性項阻力係數、慣性項昇力係數 。 研究中發現,本數值模式對於振盪來流下方柱之阻力變化預測頗為良好,數值計算之結果可以Morison equation適當地描述;然而,在昇力變化的預測上顯得較不如預期。此外,當來流之無因次振盪週期與方柱之渦散週期相應時會出現共振反應,此時之阻、昇力係數以及慣性項阻、昇力係數為最大值。zh_TW
dc.description.abstractThe unsteady forces on a square cylinder in oscillating flows with non-zero mean velocities are investigated numerically in a two-dimensional sense. At a high Reynold's number, the major parameters of the flow around a cylinder with a sinusoidal motion are the the amplitude ratio of the approaching-flow velocity (AR ) and the Keulegan-Carpenter number (KC), which vary respectively from 0.1 to 0.7 and 0.5 to 30. The resulting wind loads on the cylinder for various and values are analyzed systematically at two selected attack angles (α = 0° and 22.5° ) to examine the flow effect of the square cylinder. To predict the unsteady turbulent flow around the square cylinder, a weakly-compressible-flow method together with a dynamic subgrid-scale turbulence model is adopted. According to the Morison equation, the theoretical expressions regarding the variation of the unsteady drag, one can determine the corresponding values of Cd and Cd~ based on a least-square estimation. On the other hand , the corresponding values of Cl and Cl~ are obtained as well, while the theoretical expressions describe the general tendency of the lift variation poorly. Results show that the occurrence of peaks is apparently due to the effect of resonance between oscillation of the approaching flow and the motion of vortex shedding of the square cylinder. Finally related forces coefficients are presented in help with the analysis of engineering designs.en_US
dc.description.tableofcontents目錄 中文摘要..................................................i 英文摘要.......................................................ii 目錄.............................. .....................iii 表目錄..................................... ............vi 圖目錄...................................................vi 符號說明............... ...............................viii 第一章、緒論..............................................1 1-1、前言.................................................1 1-2、研究動機.............................................2 1-3、研究目的.............................................3 1-4、本文組織.............................................4 第二章、理論背景及相關研究................................5 2-1、鈍體氣流.............................................5 2-2、Morison equation.....................................5 2-2-1、正向力.............................................7 2-2-2、橫向力.............................................8 2-2-3、正弦週期振盪來流...................................9 2-3、Keulegen-Carpenter number (KC)......................10 2-4、速度振幅比 (AR).....................................11 2-5、相關研究............................................11 第三章、數值模擬.........................................15 3-1、前言................................................15 3-2、計算區域大小之決定..................................15 3-3、網格設計............................................15 3-4、流場模擬............................................16 3-4-1、數值方法 .........................................16 3-4-2、邊界條件..........................................20 3-4-3、壓力波消散........................................21 3-4-4、起始條件..........................................23 3-5、係數計算............................................23 第四章、結果分析.........................................24 4-1、風攻角α = 0°........................................25 4-1-1、模式之驗證........................................25 4-1-2、阻力係數(CD)......................................25 4-1-3、慣性項阻力係數(CD~)...............................26 4-1-4、阻力計算歷時圖....................................26 4-1-5、頻譜分析..........................................28 4-1-6、振盪來流對渦度場之影響............................29 4-2、風攻角α= 22.5°......................................30 4-2-1、模式之驗證........................................30 4-2-2、阻力係數(CD)......................................30 4-2-3、慣性項阻力係數(CD~)...............................31 4-2-4、昇力係數(CL)......................................31 4-2- 5、慣性項昇力係數(CL~)..............................32 4-2-6、阻力計算歷時圖....................................32 4-2-7、昇力計算歷時圖....................................33 4-2-8、頻譜分析..........................................34 4-3、討論................................................35 第五章、結論與建議.......................................36 5-1、結論................................................36 5-2、建議................................................37 參考文獻.................................................38zh_TW
dc.language.isoen_USzh_TW
dc.publisher土木工程學系所zh_TW
dc.relation.urihttp://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0808200612194300en_US
dc.subjectNumerical simulationen_US
dc.subject數值模擬zh_TW
dc.subjectSquare cylinderen_US
dc.subjectOscillating flowen_US
dc.subjectMorison equationen_US
dc.subject方柱zh_TW
dc.subject振盪流zh_TW
dc.subject莫里森方程式zh_TW
dc.title振盪來流下二維方柱紊流流場之數值探討zh_TW
dc.titleNumerical Investigations of Turbulent Flows around a Square Cylinder in Oscillating Approaching Flowen_US
dc.typeThesis and Dissertationzh_TW
item.cerifentitytypePublications-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.languageiso639-1en_US-
item.fulltextno fulltext-
item.grantfulltextnone-
item.openairetypeThesis and Dissertation-
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