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DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 朱錦洲 | |
dc.contributor.author | Yi-Loon Chiang | en |
dc.contributor.author | 江毅倫 | zh_TW |
dc.date.accessioned | 2021-06-17T08:48:21Z | - |
dc.date.available | 2024-08-07 | |
dc.date.copyright | 2019-08-07 | |
dc.date.issued | 2019 | |
dc.date.submitted | 2019-08-05 | |
dc.identifier.citation | [1] 朱佳仁, '高層建築物風場環境評估規範研議,' 內政部建築研究所研究報 告, 2000.
[2] A. F. Handbook, 'American Society of Heating,' Refrigerating and Air Conditioning Engineers, Atlanta, 2005. [3] D. J. Wilson, 'Flow patterns over flat roofed buildings and application to exhaust stack design,' ASHRAE Trans., vol. 85, pp. 284-295, 1979. [4] J. H. Ferziger and M. Peric, 'Computational methods for fluid dynamics.' Springer Science & Business Media, 2012. [5] J. He and C. C. Song, 'Evaluation of pedestrian winds in urban area by numerical approach,' Journal of Wind Engineering and Industrial Aerodynamics, vol. 81, no. 1-3, pp. 295-309, 1999. [6] S. Huang, Q. Li and S. Xu, 'Numerical evaluation of wind effects on a tall steel building by CFD,' Journal of Constructional Steel Research, vol. 63, no. 5, pp. 612-627, 2007. [7] M. Tsuchiya, S. Murakami, A. Mochida, K. Kondo and Y. Ishida, 'Development of a new k−ε model for flow and pressure fields around bluff body,' Journal of Wind Engineering and Industrial Aerodynamics, vol. 67, pp. 169-182, 1997. [8] B. Blocken, J. Carmeliet and T. Stathopoulos, 'CFD evaluation of wind speed conditions in passages between parallel buildings—effect of wall-function roughness modifications for the atmospheric boundary layer flow,' Journal of Wind Engineering and Industrial Aerodynamics, vol. 95, no. 9-11, pp. 941-962, 2007. [9] B. Blocken, T. Stathopoulos and J. Carmeliet, 'CFD simulation of the atmospheric boundary layer: wall function problems,' Atmospheric Environment, vol. 41, no. 2, pp. 238-252, 2007. [10] P. A. Durbin and B. P. Reif, 'Statistical theory and modeling for turbulent flows.' Wiley Online Library, 2001. [11] T. Cebeci and P. Bradshaw, 'Momentum transfer in boundary layers,' Hemisphere Publishing Corp.; New York, 1977. [12] B. E. Launder and D. B. Spalding, 'The numerical computation of turbulent flows,' in Numerical Prediction of Flow, Heat Transfer, Turbulence and Combustion: Elsevier, pp. 96-116,1983. [13] Ansys Fluent, '12.0 User’s guide.' Ansys Inc, 2009. [14] T. van Hooff, B. Blocken and Y. Tominaga, 'On the accuracy of CFD simulations of cross-ventilation flows for a generic isolated building: comparison of RANS, LES and experiments,' Building and Environment, vol. 114, pp. 148-165, 2017. [15] T. Tamura, K. Nozawa and K. Kondo, 'AIJ guide for numerical prediction of wind loads on buildings,' Journal of Wind Engineering and Industrial Aerodynamics, vol. 96, no. 10-11, pp. 1974-1984, 2008. [16] S. Kawamoto, 'Estimation of wind loading by computational fluid dynamics-Part2: High-rise building case,' in Proc. of AIJ Annual Meeting, 1998. [17] H. Kawai, 'Pressure on three dimensional prisms in a turbulent boundary layer,' in Proc. of 7th National Symposium on Wind Eng., 1982. [18] 張兆順, 崔桂香與許春曉, 湍流大渦數值模擬的理論和應用. 清華大學出版社, 2008. [19] A. N. Kolmogorov, 'Dissipation of energy in locally isotropic turbulence,' in Akademiia Nauk SSSR Doklady, vol. 32, p. 16, 1941. [20] T. Von Kármán, 'Mechanische änlichkeit und turbulenz,' Nachrichten von der Gesellschaft der Wissenschaften zu Göttingen, Mathematisch-Physikalische Klasse, vol. 1930, pp. 58-76, 1930. [21] D. K. Lilly, 'A proposed modification of the Germano subgrid‐scale closure method,' Physics of Fluids, vol. 4, no. 3, pp. 633-635, 1992. [22] S. Menon, P. K. Yeung, W. W. Kim, 'Effect of subgrid models on the computed interscale energy transfer in isotropic turbulence,' Computers and fluids, vol. 25, no. 2, pp. 165-180, 1996. [23] A. Davenport, 'The relationship of wind structure to wind loading,' in Proc. Conf. on Wind Effects on Buildings & Structures, HMSO, vol. 54, 1965. [24] J. R. Shewchuk, 'Lecture notes on Delaunay mesh generation,' University of California, Berkeley: Department of Electrical Engineering and Computer Science ,1999. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74658 | - |
dc.description.abstract | 雖然研究城市環境風場的學者很多,但是探討高層建築對於地下室的影響卻鮮少有人提及。由於迎風面流速較高,導致強風流入迎風面開口的地下室,使內部風速與壓力上升,造成人員行走與搬運貨物上的困難。強風通過狹縫的聲音也讓人心惶惶,嚴重時可能會使電梯設備損壞無法正常開啟關閉。
本研究使用大渦模擬(Large Eddy Simulation)計算含有地下室之高層建築物的高雷諾數流動。為了準確模擬流場流動,在近地與建築物設置邊界層網格,入流使用指數剖面大氣邊界層,建築物周圍與地面設置無滑移條件,並在外流場與地下室設置出口。研究結果表明進入地下室的氣流並不是地表氣流,而是建築物高度1/2至2/3處之氣流,藉由迎風面下衝渦流(upstream downwash vortex)流經地表並進入地下室。由於大氣邊界層高度越高速度越快的特性,流入地下室的氣流風速是高於地表風速的,高速氣流的流入會使地下室入口風速與電梯門處壓力上升。分析不同風向上的變化可以發現,若風向與迎風面夾角越大,入口處的二次分離流動區域增加,減少進入地下室的氣流,達到降低電梯門壓力的效果。若將地下室入口處外觀改變以阻擋氣流流入,發現在地下室車道加上屋頂可以有效減少入口處風速與電梯門壓力50%以上。車道入口高度降低更能有效地降低電梯門壓力。 | zh_TW |
dc.description.abstract | Although there are many scholars studying the urban environmental wind field, it is rarely mentioned that the influence of high-rise buildings on the basement . Due to the high flow velocity on the windward side, strong winds flow into the basement opening in the windward side, causing the internal wind speed and pressure to rise, causing difficulties for personnel to walk and carry goods. The sound of strong wind passing through the slit is also heart-wrenching. In severe cases, the elevator equipment may be damaged and cannot be opened normally.
This study uses Large Eddy Simulation to calculate high Reynolds number flows for high-rise buildings with a basement. In order to accurately simulate the flow field flow, a boundary layer grid is set in the near ground and the building. The inflow uses the exponential atmospheric boundary layer, and there is no slip condition around the building and the ground, and an exit is set in the outer flow field and the basement. The results show that the airflow into the basement is not close to the ground airflow, but the airflow at 1/2 to 2/3 of the height of the building, flowing through the ground and entering the basement through the upstream downwash vortex.Because the higher the boundary layer height is, the faster the velocity is. The airflow velocity into the basement is higher than the surface wind speed. The inflow of high-speed airflow will increase the inlet wind speed of the basement and the pressure at the elevator door. Analysis of the changes in different wind directions can be found that if the angle between the wind direction and the windward surface is larger, the secondary separation flow area at the entrance increases, reducing the airflow entering the basement and achieving the effect of reducing the pressure of the elevator door. If the appearance of the entrance to the basement is changed to block the inflow of air. If the appearance of the basement entrance is changed to block the inflow of airflow, it is found that adding a roof to the basement lane can effectively reduce the wind speed at the entrance and the elevator door pressure by more than 50%. The reduction in lane entry height is more effective in reducing elevator door pressure. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T08:48:21Z (GMT). No. of bitstreams: 1 ntu-108-R06543070-1.pdf: 7446272 bytes, checksum: 2949a26a306f2e424b989ed4517f53fa (MD5) Previous issue date: 2019 | en |
dc.description.tableofcontents | 致謝 ii
摘要 iv Abstract vi 圖目錄 xi 表目錄 xv 第一章 緒論 1 1.1前言 1 1.2風場介紹 2 1.2.1迎風面下衝漩渦 2 1.2.2建築物尾流 3 1.2.3穿堂風 4 1.2.4角隅強風 5 1.2.5縮流 6 1.3數值方法介紹 6 1.4文獻回顧 8 1.5研究動機 11 1.6研究結論 11 第二章 理論介紹 12 2.1紊流 12 2.1.1紊流能量傳遞 12 2.1.2邊界層理論 14 2.2大渦模擬模型理論 19 2.2.1過濾器性質 19 2.2.2過濾Navier-Stokes方程式 20 2.2.3次網格模型 21 第三章 模型架構與網格 24 3.1計算域與邊界條件 24 3.2網格 28 3.2.1模型網格設置 29 3.3數值方法 31 3.3.1空間離散方法 31 3.3.2時間離散方法 35 3.4監測點與監測面 36 第四章 量測介紹 37 4.1簡介 37 4.1.1地下室站 37 4.1.2頂樓站 38 4.2量測設備 39 4.2.1資料收集器 39 4.2.2風速風向計與風速計 40 4.2.3垂直風速計 41 4.2.4大氣壓力計與溫度計 42 第五章 結果與討論 43 5.1量測結果 43 5.1.1地下室量測結果 43 5.1.2頂樓量測結果 47 5.2模擬結果 50 5.2.1風速變化 50 5.2.2風向夾角變化 60 5.2.3加蓋比較 67 5.2.4 θ=90°加蓋比較 73 5.2.5風速對電梯門的影響 77 第六章 結論與未來展望 80 參考文獻 82 | |
dc.language.iso | zh-TW | |
dc.title | 大渦數值模擬高層建築物地下室風場分析與改善可行性之研究 | zh_TW |
dc.title | Large eddy simulation of wind field analysis and improvement feasibility of high-rise building basement | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-2 | |
dc.description.degree | 碩士 | |
dc.contributor.coadvisor | 張建成 | |
dc.contributor.oralexamcommittee | 郭光輝,蘇正瑜,謝政達 | |
dc.subject.keyword | 行人風場,高層建築物,地下室,紊流,大渦模擬,風速, | zh_TW |
dc.subject.keyword | Pedestrian Wind Environmental,high-rise buildings,basement,turbulence,large eddy simulation,wind speed, | en |
dc.relation.page | 84 | |
dc.identifier.doi | 10.6342/NTU201902564 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2019-08-05 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 應用力學研究所 | zh_TW |
顯示於系所單位: | 應用力學研究所 |
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