Simulation of the turbulence statistics of a downburst boundary layer
Modeling the downburst boundary layer, even only its statistical properties, is very important to investigate the wind load on structures in transient flow. In this study, we try to model the turbulence statistics of a downburst boundary layer in an actively-controlled wind tunnel that has 99 fans controlled individually through a computer. The flow, at the beginning, is controlled to be of conventional boundary layer type. A sudden abrupt velocity change is then introduced into the flow which has a positive shear on the lower part and minus shear in the upper part of the boundary layer, which is a typical vertical distribution of wind speed in a downburst. The evolutionary process of the gust front is not considered at this stage. The results show that this wind tunnel is advantageous to simulate the turbulence statistics of transient flow although the acceleration is not great enough to satisfy the similarity law.
downburst turbulence statistics activelly control wind tunnel
S.Cao Y.Zhao H.Ozono Y.Tamura A .Kareem Z.Duan
Wind Engineering Research Center, Tokyo Polytechnic University, Tokyo, 243-0297 Japan Department of Civil Engineering, Harbin Institute of Technology, Harbin,150090 China Department of Physics, Miyazaki University, Miyazaki, 889-2155 Japan Department of Civil Engineering and Geological Sciences, University of Notre Dame, IN 46556 USA
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）