NUMERICAL EXPERIMENTS ON TURBULENT FLOW WITHIN AND ABOVE URBAN CANOPIES WITH DIFFERENT BUILDING ASPECT RATIO

• IWADO Tetsuya

  ehime university

• MORIWAKI Ryo

  ehime university

• RAASCH Siegfried

  Leibniz University of Hannover

• LETZEL Marcus Oliver

  Ingenieurbüro Lohmeyer GmbH and Co. KG

Bibliographic Information

Other Title

• 建物アスペクト比の変化に伴う都市キャノピー流れの変化に関する数値実験

Abstract

We investigated turbulent flow around building arrays of four different building aspect ratio (H/W) using large eddy simulation. This simulation was aimed to study the similarity of urban canopy flow and plant canopy flow which was expected with the increase of building aspect ratio. As aspect ratio increased, the streamwise flow speed within the urban canopy decreased. Drag coefficient of urban canopy increased with aspect ratio. This is probably due to the increase of frontal area index and the occurrence of transverse flow along the streets. According to quadrant analyses and turbulence statistics, momentum transfer became more efficient as aspect ratio increased. At a high aspect ratio, momentum was more effectively transferred at cross sections than gaps.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 67 (4), I_331-I_336, 2011

  Japan Society of Civil Engineers

Keywords

• LES
• aspect ratio
• urban canopy
• plant canopy
• turbulent flow

Details

• CRID: 1390001205353327360
• NII Article ID: 130004557591
• DOI: 10.2208/jscejhe.67.i_331
• ISSN: 2185467X
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed