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- W2790684706 abstract "Large-eddy simulation (LES) is used to investigate the effects of building-height variability on turbulent flows over an actual urban area, the city of Kyoto, which is reproduced using a 2-m resolution digital surface dataset. Comparison of the morphological characteristics of Kyoto with those of European, North American, and other Japanese cities indicates a similarity to European cities but with more variable building heights. The performance of the LES model is validated and found to be consistent with turbulence observations obtained from a meteorological tower and from Doppler lidar. We conducted the following two numerical experiments: a control experiment using Kyoto buildings, and a sensitivity experiment in which all the building heights are set to the average height over the computational region $$h_{all}$$ . The difference of Reynolds stress at height $$z=2.5h_{all}$$ between the control and sensitivity experiments is found to increase with the increase in the plan-area index ( $$lambda _p$$ ) for $$lambda _p > 0.32$$ . Thus, values of $$lambda _papprox 0.3$$ can be regarded as a threshold for distinguishing the effects of building-height variability. The quadrant analysis reveals that sweeps contribute to the increase in the Reynolds stress in the control experiment at a height $$z= 2.5h_{all}$$ . The exuberance in the control experiment at height $$z=0.5h_{all}$$ is found to decrease with increase in the building-height variability. Although the extreme momentum flux at height $$z=2.5h_{all}$$ in the control experiment appears around buildings, it contributes little to the total Reynolds stress and is not associated with coherent motions." @default.
- W2790684706 created "2018-03-29" @default.
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- W2790684706 date "2018-03-03" @default.
- W2790684706 modified "2023-10-15" @default.
- W2790684706 title "Large-Eddy-Simulation Study of the Effects of Building-Height Variability on Turbulent Flows over an Actual Urban Area" @default.
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- W2790684706 doi "https://doi.org/10.1007/s10546-018-0344-8" @default.
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