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Large-eddy simulation of metropolitan Tokyo using locally mesh-refined lattice Boltzmann method

Onodera, Naoyuki   ; Idomura, Yasuhiro   ; Hasegawa, Yuta   ; Asahi, Yuichi   ; Inagaki, Atsushi*; Shimose, Kenichi*; Hirano, Kohin*

Our research group has been developing a multi-scale wind simulation code, CityLBM, which covers a wide area including the entire city as well as small alleys. CityLBM can perform real-time simulations by applying the AMR method and GPU acceleration to the lattice Boltzmann method. This study performed a meter-resolution simulation of the area around the Tokyo Institute of Technology. The simulation results were compared with the Doppler lidar observations, and it was confirmed that the simulation reproduced the wind conditions well, even under the conditions of large changes in the main wind direction during the day.

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