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標題: 方形截面建築紊流流場之數值探討
Numerical Investigation on Turbulent Flow Around Building with Square Cross-Section
作者: 許文雄
Wen-Shiung, Shiu
關鍵字: Computational Wind Engineering;計算風工程;Large Eddy Simulation;大渦模擬
出版社: 土木工程學系

Investigation on flow around a rectangular bluff body has been an important subject in building research. To evaluate the dynamic response of a structure, the flow effects on the building (such as the variation and mean values of lift and drag) and related flow characteristics are necessary during the design stage. So far, there are mostly obtained by wind tunnel model testings. However, the accuracy of the experimental results usually suffers from scale effect. Besides, the achievement of the complete flow data is generally costly. Therefore, the application of high-speed computation in flow simulation then becomes an important way of the analyses.
The objective of the study is to investigate numerically the turbulent flow around a three-dimensional surface-mounted rectangular cylinder. In the research, a weakly-compressible-flow method incorporated with a space-average large-eddy-simulation technique is adopted. By varying the aspect ratios of the building (the ratio of vertical dimension from the surface to the across-wind dimension), the resulting flow and wake characteristics are analyzed. Results show that the major influence of the flow characteristics is the aspect ratio. As the aspect ratio increases, the mean drag coefficient; the variations of the lift and drag coefficient also increase. The general characteristics of the flow remains unchanged as Reynolds number exceeds about 105. Finally, the root-mean-square value of the drag coefficient increase as aspect ratio and the Reynolds number increase.
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