Wind tunnel experiment on rooftop wind environment of an isolated building for Safe Urban-Air-Mobility Operations

This is a dataset for the measurement results of a wind tunnel experiment on rooftop wind environment of an isolated building for Safe Urban-Air-Mobility Operations. The experiments were conducted in the boundary layer wind tunnel at Institute of Industrial Science, the University of Tokyo. The test section had dimensions of 1.8 × 2.2 × 16.47 m3 (height × width × length). The wind tunnel can provide adjustable inflow wind speed from 0.2 m/s to 20 m/s. Three vertical triangular spires and a large number of wooden cubes with dimensions of 3, 6 and 9 cm were placed upstream of the test section to generate and reproduce turbulence and the atmospheric boundary layer (ABL) profile. A 1:1:2 single block model with a block height of H=0.32 m was set in the turbulent boundary layer. 

The time-averaged velocity and turbulence intensity of inflow were measured in the wind tunnel using a constant temperature anemometer with an X wire probe (55P61, Dantec). The vertical profile of the time-averaged velocity can be fitted by the power law, where the power-law exponent is 0.22. In this study, the wind velocity at building height UH was set as 2.85 m/s. Three wind directions were considered: perpendicular, 22.5-degree and 45-degree to the building's frontal edge.

The velocity measurements included the velocity distribution in the rooftop region of the building. The measurement heights are in the horizontal planes of 1.05H, 1.125H and 1.25H. Wind velocity was measured using a constant-temperature hot wire anemometer (CT-HWA) with a split-fiber probe (SFP), (55R55, DANTEC). The SFP can measure the adverse velocity for a wind direction. The CT-HWA can measure the wind velocity from 0.02 to 300 m/s. The measuring accuracy depends on the calibration accuracy, which is typically around 0.5% and will not exceed 2%. The response time is short enough and can be negligible. Each measurement's period time was 90 s at a frequency of 1000 Hz. The time-averaged velocity, standard deviation, skewness, kurtosis, 5% percentile and 95% percentile of the velocity time series are provided.