QQ客服 官方微博 反馈留言

	CFD boundary conditions for contaminant dispersion, heat transfer and airflow simulations around human occupants in indoor environments
	Srebric, Jelena ; Vukovic, Vladimir ; He, Guoqing ; Yang, Xudong
	2010-05-10 ; 2010-05-10
会议名称	BUILDING AND ENVIRONMENT ; 10th International Conference on Indoor Air Quality and Climate (Indoor Air 2005) ; Beijing, PEOPLES R CHINA ; Web of Science
关键词	CFD boundary conditions high-concentration gradients human simulators point source areas indoor environment DISPLACEMENT VALIDATION VENTILATION REMOVAL ROOMS Construction & Building Technology Engineering, Environmental Engineering, Civil
中文摘要	Indoor computational fluid dynamics (CFD) simulations can predict contaminant dispersion around human occupants and provide valuable information in resolving indoor air quality or homeland security problems. The accuracy of CFD simulations strongly depends on the appropriate setting of boundary conditions and numerical simulation parameters. The present study explores influence of the following three key boundary condition settings on the simulation accuracy: (1) contaminant source area size, (2) convective/radiative heat fluxes, and (3) shape/size of human simulators. For each of the boundary conditions, numerical simulations were validated with experimental data obtained in two different environmental chambers. In CFD simulations, a small release area of a contaminant point source causes locally high concentration gradients that require a very fine local grid system. This fine grid system can slow down the simulations substantially. The convergence speed of calculation is greatly increased by the source area enlargement. This method will not influence the simulation accuracy of passive point source within well-predicted airflow field. However, for active point source located within complicated airflow filed, such an enlargement should be carried out cautiously because simulation inaccuracy might be introduced. For setting thermal boundary conditions, convection to radiation heat flux ratio is critical for accurate CFD computations of temperature profiles around human simulators. The recommended convection to radiation (C:R) ratio is 30:70 for human simulators. Finally, simplified human simulators can provide accurate temperature profiles within the whole domain of interest. However, velocity and contaminant concentration simulations require further work in establishing the influence of simplifications on the simulation accuracy in the vicinity of the human simulator. (C) 2006 Elsevier Ltd. All rights reserved.
会议录出版者	PERGAMON-ELSEVIER SCIENCE LTD ; OXFORD ; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/19769]
专题	清华大学
推荐引用方式 GB/T 7714	Srebric, Jelena,Vukovic, Vladimir,He, Guoqing,et al. CFD boundary conditions for contaminant dispersion, heat transfer and airflow simulations around human occupants in indoor environments[C]. 见:BUILDING AND ENVIRONMENT, 10th International Conference on Indoor Air Quality and Climate (Indoor Air 2005), Beijing, PEOPLES R CHINA, Web of Science.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。