A Numerical Study for Turbulent Flow and Thermal Influence Over Inhomogenous Canopy of Roughness Elements

doi:10.1007/s10652-005-2490-z

IMECH-IR > 力学所知识产出(1956-2008)

	A Numerical Study for Turbulent Flow and Thermal Influence Over Inhomogenous Canopy of Roughness Elements
	Xie ZT; Li JC(李家春); Xie, ZT (reprint author), Univ Southampton, Sch Engn Sci, Southampton SO17 1BJ, Hants, England.
发表期刊	Environmental Fluid Mechanics
	2005
卷号	5 期号:6 页码:577-597
ISSN	1567-7419
摘要	A large-eddy simulation with transitional structure function(TSF) subgrid model we previously proposed was performed to investigate the turbulent flow with thermal influence over an inhomogeneous canopy, which was represented as alternative large and small roughness elements. The aerodynamic and thermodynamic effects of the presence of a layer of large roughness elements were modelled by adding a drag term to the three-dimensional Navier-Stokes equations and a heat source/sink term to the scalar equation, respectively. The layer of small roughness elements was simply treated using the method as described in paper (Moeng 1984, J. Atmos Sci. 41, 2052-2062) for homogeneous rough surface. The horizontally averaged statistics such as mean vertical profiles of wind velocity, air temperature, et al., are in reasonable agreement with Gao et al.(1989, Boundary layer meteorol. 47, 349-377) field observation (homogeneous canopy). Not surprisingly, the calculated instantaneous velocity and temperature fields show that the roughness elements considerably changed the turbulent structure within the canopy. The adjustment of the mean vertical profiles of velocity and temperature was studied, which was found qualitatively comparable with Belcher et al. (2003, J Fluid Mech. 488, 369-398)'s theoretical results. The urban heat island(UHI) was investigated imposing heat source in the region of large roughness elements. An elevated inversion layer, a phenomenon often observed in the urban area (Sang et al., J Wind Eng. Ind. Aesodyn. 87, 243-258)'s was successfully simulated above the canopy. The cool island(CI) was also investigated imposing heat sink to simply model the evaporation of plant canopy. An inversion layer was found very stable and robust within the canopy.
学科领域	力学
DOI	10.1007/s10652-005-2490-z
收录类别	SCI
语种	英语
WOS记录号	WOS:000234874400004
关键词[WOS]	LARGE-EDDY-SIMULATION ; BOUNDARY-LAYER ; ORGANIZED STRUCTURES ; FOREST ; MODEL
WOS研究方向	Environmental Sciences & Ecology ; Mechanics ; Meteorology & Atmospheric Sciences ; Oceanography ; Water Resources
WOS类目	Environmental Sciences ; Mechanics ; Meteorology & Atmospheric Sciences ; Oceanography ; Water Resources
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/17102
专题	力学所知识产出(1956-2008)
通讯作者	Xie, ZT (reprint author), Univ Southampton, Sch Engn Sci, Southampton SO17 1BJ, Hants, England.
推荐引用方式 GB/T 7714	Xie ZT,Li JC,Xie, ZT . A Numerical Study for Turbulent Flow and Thermal Influence Over Inhomogenous Canopy of Roughness Elements[J]. Environmental Fluid Mechanics,2005,5,6,:577-597.
APA	Xie ZT,李家春,&Xie, ZT .(2005).A Numerical Study for Turbulent Flow and Thermal Influence Over Inhomogenous Canopy of Roughness Elements.Environmental Fluid Mechanics,5(6),577-597.
MLA	Xie ZT,et al."A Numerical Study for Turbulent Flow and Thermal Influence Over Inhomogenous Canopy of Roughness Elements".Environmental Fluid Mechanics 5.6(2005):577-597.

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