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DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 謝正義 | |
dc.contributor.author | Tsung-Han Tsai | en |
dc.contributor.author | 蔡宗翰 | zh_TW |
dc.date.accessioned | 2021-06-13T05:45:01Z | - |
dc.date.available | 2007-07-25 | |
dc.date.copyright | 2006-07-25 | |
dc.date.issued | 2006 | |
dc.date.submitted | 2006-07-12 | |
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(1976). “Computation of Turbulent Flows”. 39 Roache, P.J. (1998). Verification and Validation in Computational Science and Engineering, Hermosa Publishers. 40 Hwang, R.R.., Chow, Y.C. and Peng, Y.F. (1999). Numerical study of turbulent flow over two -dimensional surface-mounted ribs in a channel. International Journal for Numerical Methods in Fluids Int. J. 31: 767–785. 41 Seginer, I., Mulhearn, P. J., Bradley, E. F., and Finnigan, J. J. (1976). Turbulent Flow in a Model Plant Canopy, Boundary-Layer Meteorol. 10, 423-453. 42 Seibert P., Beyrich F., Gryning, SE, and Joffre, S., A. Rasmussen, P. Tercier. (2000). Review and intercomparsion of operational methods for the determination of the mixing height. Atmos. Environ., 34, 1001-1027. 43 Su, H.B., Shaw, R.H., Paw, K.T., Moeng, C.H., and Sullivan, P.P. (1998). Turbulent statistics of neutrally stratified flow within and above a sparse forest from large-eddy simulation and field observations. Boundary-Layer Meteorology 88, 363-397. 44 Thom, A.S. (1971). Momentum absorption by vegetation. Quart. J. Roy. Meteor. Soc., 97, 414-428. 45 Turgeon, É., Pelletier, D., and Ignat, L. (2000). Effects of adaptivity on various finite element schemes for turbulent heat transfer and flow predictions, Numer. Heat Transfer. A 38 847–868. 46 Versteeg, H.K., and Malalaskera, W. (1995). An Introducion to Computational Fluid Dynamics- The Finite Volume Method, pp. 72-75, Addison Wesley Longman Ltd, London, UK. 47 方偉德 (民93) 大氣與森林之間紊流流場之風洞實驗,中央大學土木所碩士論文。 48 朱佳仁 (2003) 環境流體力學,科技圖書出版公司印行。 49 馬震煊 (民94) 吹吸式工業通風氣罩之紊流擴散數值模擬,台灣科技大學機械所碩士論文。 50 譚智宏 (2004) 水田於農業及都會區域溫度和緩功能評估,行政院農委會。 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33719 | - |
dc.description.abstract | 本文以二維擴散方程為基礎,模擬穩定邊界層情況下被動擴散情形。並以二維標準k-ε紊流模式(Standard k-ε model)計算建立風場之數值模型,探討水田對於其下風處之流場阻礙物,分別為(1)單棟低矮建築物與(2)森林或市蓋(urban canopy)時,水汽在穩定邊界層內風場與被動擴散傳輸情形。本模式包含水平風速、垂直風速、總壓力、紊流動能、紊動能消散率、紊流黏滯係數、濃度等變數。
在本研究中,吾人將森林分為高、中、低密度三種等級。研究結果發現:高、中密度的森林造成的流場性質,與低密度時明顯不同。而物質紊流擴散的混合層高度與森林(或市蓋)密度成正比。流場阻礙物周遭的濃度累積量,正比於森林(或市蓋)密度。另外,不同的森林(或市蓋)密度,也造成流場局部不同的濃度混合效率。 | zh_TW |
dc.description.abstract | The present study is based on a two-dimensional turbulence diffusion model, in which the passive-mixing in neutral atmosphere boundary layer is simulated. In the numerical model, two-dimensional standard k-ε turbulent model is employed to simulate the flow field. The passive transportation of water vapor passing by solid structure and permeable structures is discussed. The parameters in the present numerical model include horizontal wind velocity, vertical wind velocity, total pressure, turbulent kinetic energy, turbulent dissipation rate, turbulent viscosity, and water vapor concentration.
In the research, forest density is classified into three levels: high, medium and low. The result shows that the characteristics of flow field in high and medium dense forest are obviously different from that in low dense forest. The height of mixing layer and the aggregate value of vapor concentration grow with the forest density. Furthermore, density levels of the forest also cause different diffusion effect in the flow field. | en |
dc.description.provenance | Made available in DSpace on 2021-06-13T05:45:01Z (GMT). No. of bitstreams: 1 ntu-95-R93622025-1.pdf: 1564007 bytes, checksum: a9281cea928a276509ac97424d23aeb1 (MD5) Previous issue date: 2006 | en |
dc.description.tableofcontents | 中文摘要………………………………………………………………………i
英文摘要……………………………………………………………………...ii 目錄………………………………………………………………………….iii 圖目錄……………………………………………………………………….v 表目錄……………………………………………………………………….ix 第一章 前言…………………………………………….…………………...1 1.1 研究動機……………………………………………………………...2 1.2 研究目的……………………………………………………………...4 第二章 文獻回顧與理論介紹………………………………………………6 2.1 文獻回顧……………………………………………………………...6 2.2 如何選用適當之數值方法與控制求解準確度…………………...…11 2.3 控制方程之選定……………………………………………………...12 2.4 紊流控制方程………………………………………………………...13 2.4.1 混合長度模式……………………………………………………15 2.4.2 k-ε模式(本模式與參考文獻之數值模式) ……………………...16 2.4.3 雷諾剪應力模式…………………………………………………18 2.4.4 大渦模擬…………………………………………………………18 2.4.5 直接數值模擬DNS………………………………………………19 2.5 離散法則……………………………………………………………...19 2.6 截尾誤差(Truncation error) ………………………………………...21 2.7 邊牆函數(Wall function)……………………………………………..21 2.8 濃度擴散……………………………………………………………...23 第三章 模式驗證……………………………………………………………30 3.1 本論文之數值模式…………………………………………………...30 3.2 參考文獻之數值模式………………………………………………31 3.3 邊界條件……………………………………………………………...32 3.4 計算細節……………………………………………………………...33 3.5 網格獨立性分析……………………………………………………...34 3.6 驗證結果……………………………………………………………...34 第四章 論文模型介紹………………………………………………………46 4.1 模擬區域……………………………………………………………...46 4.2 入流風速選定………………………………………………………...47 4.3 網格介紹……………………………………………………………...49 第五章 結果討論……………………………………………………………57 5.1 流場特性………………………………………………………….…..57 5.1.1 水平速度分析……………………………………………………57 5.1.2 流線………………………………………………………………58 5.1.3 紊流強度…………………………………………………………59 5.2 濃度擴散……………………………………………………………...59 5.2.1 混合層高度………………………………………………………61 5.2.2 最大濃度值發生高度……………………………………………62 5.2.3 濃度累積量………………………………………………………63 第六章 結論與建議…………………………………………………………93 6.1 結論…………………………………………………………………...93 6.2 建議…………………………………………………………………...94 參考文獻………………………………………………………………………95 | |
dc.language.iso | zh-TW | |
dc.title | 非均勻地形之紊流擴散模擬 | zh_TW |
dc.title | Numerical Simulation of Turbulent Diffusion over Non-homogeneous Terrain | en |
dc.type | Thesis | |
dc.date.schoolyear | 94-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 張倉榮,陳明志,朱佳仁 | |
dc.subject.keyword | 二維擴散,標準k-ε紊流模式,流場阻礙物,森林密度,市蓋,混合層高度,濃度累積量,濃度混合效率, | zh_TW |
dc.subject.keyword | two-dimensional turbulence diffusion,standard k-ε model,forest density,mixing layer height,diffusion efficiency, | en |
dc.relation.page | 99 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2006-07-14 | |
dc.contributor.author-college | 生物資源暨農學院 | zh_TW |
dc.contributor.author-dept | 生物環境系統工程學研究所 | zh_TW |
顯示於系所單位: | 生物環境系統工程學系 |
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