Large-Eddy Simulations of Air Flow and Turbulence within and around Low-Aspect-Ratio Cylindrical Open-Top Chambers

被引:8
作者
Cunningham, Philip [1 ]
Linn, Rodman R. [1 ]
Koo, Eunmo [1 ]
Wilson, Cathy J. [1 ]
机构
[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
关键词
Airflow; Mixing; Turbulence; Vegetation-atmosphere interactions; Large eddy simulations; Biosphere-atmosphere interaction; CIRCULAR-CYLINDER; INFRARED HEATER; WIND-TUNNEL; FIELD; RESPONSES; BEHAVIOR; SURFACE; CANOPY; MODEL;
D O I
10.1175/JAMC-D-12-041.1
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The flow around cylindrical open-top chambers (OTCs) with aspect ratios (i.e., height-to-diameter ratios) much less than unity is investigated using a large-eddy simulation (LES) model. The solid structures are represented using the immersed boundary method, and the ambient flow in which the OTCs are embedded is representative of a turbulent atmospheric boundary layer. Results from the LES model show that the flow inside OTCs depends strongly on the height of the chamber wall. In particular, as chamber height increases the flow impinging on the upstream wall is deflected more in the vertical direction, a stronger recirculation flow develops inside the chamber, turbulence intensities are greater, and there is stronger vertical transport and mixing within the OTC, even at or near the ground. For low wall heights (i.e., very low aspect ratios), however, the flow impinging on the OTC is only diverted weakly in the vertical direction; aside from a small recirculation zone inside the OTC near the upstream wall and a small region near the downstream wall as the flow separates from the ground, there is minimal vertical mixing and the turbulence intensities are small. The results of these simulations, while general in nature, are particularly relevant to design considerations for manipulative field experiments in highly heterogeneous, low-stature ecosystems such as Arctic shrubs and grasses.
引用
收藏
页码:1716 / 1737
页数:22
相关论文
共 46 条
[1]   The potential impacts of pollution on a nondrizzling stratus deck: Does aerosol number matter more than type? [J].
Andrejczuk, M. ;
Reisner, J. M. ;
Henson, B. ;
Dubey, M. K. ;
Jeffery, C. A. .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2008, 113 (D19)
[2]   A WIND-TUNNEL STUDY TO DESIGN LARGE, OPEN-TOP CHAMBERS FOR WHOLE-TREE POLLUTANT EXPOSURE EXPERIMENTS [J].
BALDOCCHI, DD ;
WHITE, R ;
JOHNSTON, JW .
JAPCA-THE JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION, 1989, 39 (12) :1549-1556
[3]   Numerical simulations of grass fires using a coupled atmosphere-fire model: Dynamics of fire spread [J].
Cunningham, Philip ;
Linn, Rodman R. .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2007, 112 (D5)
[4]  
DAVIS JM, 1983, BOUND-LAY METEOROL, V25, P193, DOI 10.1007/BF00123974
[5]   Combined immersed-boundary finite-difference methods for three-dimensional complex flow simulations [J].
Fadlun, EA ;
Verzicco, R ;
Orlandi, P ;
Mohd-Yusof, J .
JOURNAL OF COMPUTATIONAL PHYSICS, 2000, 161 (01) :35-60
[6]  
Frederich O., 2008, Journal of Numerical Analysis, Industrial and Applied Mathematics, V3, P231
[7]   LES of the flow around a circular cylinder of finite height [J].
Fröhlich, J ;
Rodi, W .
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 2004, 25 (03) :537-548
[8]   Tomographic and time resolved PIV measurements on a finite cylinder mounted on a flat plate [J].
Hain, Rainer ;
Kaehler, Christian J. ;
Michaelis, Dirk .
EXPERIMENTS IN FLUIDS, 2008, 45 (04) :715-724
[9]   A method for experimental heating of intact soil profiles for application to climate change experiments [J].
Hanson, Paul J. ;
Childs, Kenneth W. ;
Wullschleger, Stan D. ;
Riggs, Jeffery S. ;
Thomas, Warren K. ;
Todd, Donald E. ;
Warren, Jeffrey M. .
GLOBAL CHANGE BIOLOGY, 2011, 17 (02) :1083-1096
[10]  
HEAGLE A S, 1973, Journal of Environmental Quality, V2, P365