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Nakayama, Hiromasa; Takemi, Tetsuya*
Atmospheric Science Letters, 25(4), p.e1204_1 - e1204_9, 2024/04
We proposed a dynamically controlled recycling method. The magnitude of turbulent fluctuations is dynamically controlled to match with the target turbulence statistics using a turbulence enhancement coefficient based on the ratio of the target to the computed values. When compared to the recommended data of Engineering Science Data Unit (ESDU) 85020, the turbulence characteristics were quantitatively generated well. Furthermore, the spanwise and vertical plume spreads were also reproduced well. It is concluded that the dynamically controlled recycling method successfully simulates plume dispersion in a neutral turbulent boundary layer.
Nakayama, Hiromasa; Takemi, Tetsuya*; Nagai, Haruyasu
Atmospheric Science Letters, 13(3), p.180 - 186, 2012/07
Times Cited Count：54 Percentile：80.96(Geochemistry & Geophysics)We propose an approach to generate turbulent flows by using mesoscale meteorological simulations in order to conduct building-resolving Large-Eddy Simulation (LESs) of boundary-layer flows over urban areas under realistic meteorological conditions. The urban surface geometry was explicitly represented in the LES model. This approach was applied for a strong wind event in Tokyo owing to the landfall of a major typhoon whose intensity and track was well reproduced in the meteorological simulation. The observed ranges of wind fluctuations and gust factors, and significant decelerations of wind speeds within the urban canopy layer were successfully represented in the LES.
