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題 名 | 非均勻地形之紊流擴散模擬=Numerical Simulation of Turbulent Diffusion over Non-homogeneous Terrain |
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作 者 | 謝正義; 蔡宗翰; | 書刊名 | 農業工程學報 |
卷 期 | 53:4 2007.12[民96.12] |
頁 次 | 頁56-68 |
分類號 | 430.1633 |
關鍵詞 | κ-ε紊流模式; 紊流擴散; 水氣傳輸; κ-ε model; Turbulent diffusion; Water vapor transport; |
語 文 | 中文(Chinese) |
中文摘要 | 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。 |
英文摘要 | 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. |
本系統中英文摘要資訊取自各篇刊載內容。