非均勻地形之紊流擴散模擬

本研究利用k-ε數值模式結合擴散方程式模擬在非均勻地形下，灌溉區域（水田）的風場及水氣受隙阻礙物（森林）及不可穿透阻礙物（建築物）之影響的紊流擴散情形。本研究並將孔隙阻礙物分爲高、中、低度三種等級，結果發現高、中密度孔隙阻礙物造成之流場性質與低密度時明顯不同，物質（水氣）紊流擴散的混合層高度與阻礙物密度成正比：流場阻礙物同遭之濃度累積量正比於阻礙物密度：另外，不同的阻礙物密度亦造成流場局部不同濃度混合效率。

Keywords

k-ε紊流模式；紊流擴散；水氣傳輸

Parallel abstracts

This study presented a two-dimensional k-ε model in conjunction with the advection-diffusion equation to simulate the field and turbulent transport of water vapor over an irrigated non-uniform terrain (e.g., rice paddy) where a porous (forest)and impermeable (building) obstacle was encountered. In this research, porous obstacles were classified into three density levels: high, medium and low. The simulation results showed that the characteristics of flow field in high and medium porous density were obviously different form those in low density ones. The height of mixing layer and the accumulated value of water vapor concentration grew with the porous density. Furthermore, porous density levels also caused different turbulent turbulent transport effects in the flow field.

Parallel keywords

k-ε model ； Turbulent diffusion ； Water vapor transport

Read-around

謝正義、陳明志、許志揆、賴進松（2009）。非均勻地形風場之數值模擬研究。農業工程學報，55(1)，81-91。https://doi.org/10.29974/JTAE.200903.0008
Chiu, C. H., Liou, J. H., & Chiou, M. C. (2009). Surface Rejuvenation Model分析紊流微粒傳遞. 中國機械工程學刊, 30(3), 239-248. https://doi.org/10.29979/JCSME.200906.0008
Liou, J. H. (2008). Surface Rejuvenation Model分析紊流微粒傳遞 [master's thesis, National Formosa University]. Airiti Library. https://doi.org/10.6827/NFU.2008.00020
Yen, H. C. (2009). 有關均勻分佈數列之研究 [master's thesis, National Tsing Hua University]. Airiti Library. https://www.airitilibrary.com/Article/Detail?DocID=U0016-1111200916013278
廖清標、吳銘順、涂冠宇、王偉蒼（2006）。Numerical Simulation of the Debris Flow by TVD Scheme。中華水土保持學報，37(4)，377-387。https://doi.org/10.29417/JCSWC.200612_37(4).0005

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非均勻地形之紊流擴散模擬

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