WIND TUNNEL EVALUATION OF FLOW FIELDS WITHIN STREET CANYONS WITH THERMAL STRATIFICATION : Experimental studies on gaseous diffusion in urban areas Part 4

温度成層下のストリートキャニオン内部流れに対する道路幅の影響に関する風洞実験 : 市街地における汚染物の拡散に関する実験的研究 その4

Results of wind tunnel experiments on the influences of road width and thermal stratification on air flow in urban street canyons are presented. 1) A typical characteristic of the flow in street canyons is the formation of a strong cavity eddy when the road width L is equal to one to two times the height of the adjacent buildings. H. 2) The cavity eddy weakens as length/height (L/H) is increased from 2 to 4 and decays with further increases in road width under neutral conditions. 3) Although the cavity eddy strengthens under unstably stratified conditions within the skimming flow regime, cavity eddy decay occurs earlier in wake interference flow regimes and the transition to isolated roughness flow regimes begins earlier than under neutral conditions. 4) Thermal stratification has a greater impact on turbulence than does road width.

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  • Accession Number: 01631634
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Feb 3 2017 3:29PM