検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

A Numerical study of turbulence statistics and the structure of a spatially-developing boundary layer over a realistic urban geometry

実都市形状を用いた気流計算による乱流統計量と空間構造の関係性の解明

稲垣 厚志*; 神田 学*; Ahmad, N. H.*; 八木 綾子*; 小野寺 直幸; 青木 尊之*

Inagaki, Atsushi*; Kanda, Manabu*; Ahmad, N. H.*; Yagi, Ayako*; Onodera, Naoyuki; Aoki, Takayuki*

本研究では、東京都市部に対して、中立安定状態における大気境界層に対する数値解析を行なった。GPUを用いた並列計算を実施することで、19.2km$$times$$4.8km$$times$$1kmの領域に対して2m解像度のラージエディ・シミュレーションが可能となった。大規模計算結果より、境界層上部の乱流統計量や境界層全域におよび特徴的なストリーク構造等の再現が可能であることが確認された。

The applicability of outer-layer scaling is examined by numerical simulation of a developing neutral boundary layer over a realistic building geometry of Tokyo. Large-eddy simulations are carried out over a large computational domain 19.2 km $$times$$ 4.8 km $$times$$1 km, with a fine grid spacing (2 m) using the lattice-Boltzmann method with massively parallel graphics processing units. Results from simulations show that outer-layer features are maintained for turbulence statistics in the upper part of the boundary layer, as well as the width of predominant streaky structures throughout the entire boundary layer. This is caused by the existence of very large streaky structures extending throughout the entire boundary layer, which follow outer-layer scaling with a self-preserving development. We assume the top-down mechanism in the physical interpretation of results.

Access

:

- Accesses

InCites™

:

パーセンタイル:68.43

分野:Meteorology & Atmospheric Sciences

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.