TY - GEN
T1 - Numerical simulation of wind flow structures and pollutant dispersion within street canyon under thermally unstable atmospheric conditions
AU - Yazid, Afiq Witri Muhammad
AU - Che Sidik, Nor Azwadi
AU - Mohamed Salim, Salim
PY - 2014
Y1 - 2014
N2 - Numerical studies were conducted to envisage the wind flow structures and pollutant dispersion in street canyon for differential heated wall and Froude numbers. Standard k-ε was used as its shows good accuracy compared to Renormalization Group (RNG) k-ε and Realizable k-ε. The obtained results demonstrate that the differentially heated wall/floor gives significant effects on the wind flow field compared with those under isothermal conditions. At high Froude number, there were no discernible effects on the flow structures and pollutant dispersion. At low Froude number however, vortex intensification was observed for the case of ground or leeward heated wall and results in reduced pollutant in street canyon. Meanwhile, for the case of windward heated wall, the ventilation was much reduced and results in higher pollutant in street canyon.
AB - Numerical studies were conducted to envisage the wind flow structures and pollutant dispersion in street canyon for differential heated wall and Froude numbers. Standard k-ε was used as its shows good accuracy compared to Renormalization Group (RNG) k-ε and Realizable k-ε. The obtained results demonstrate that the differentially heated wall/floor gives significant effects on the wind flow field compared with those under isothermal conditions. At high Froude number, there were no discernible effects on the flow structures and pollutant dispersion. At low Froude number however, vortex intensification was observed for the case of ground or leeward heated wall and results in reduced pollutant in street canyon. Meanwhile, for the case of windward heated wall, the ventilation was much reduced and results in higher pollutant in street canyon.
KW - Pollutant dispersion
KW - Street canyon
KW - Thermal flow
KW - Turbulence models
KW - Wind flow structures
U2 - 10.4028/www.scientific.net/AMM.554.655
DO - 10.4028/www.scientific.net/AMM.554.655
M3 - Conference contribution
AN - SCOPUS:84903541794
SN - 9783038351092
VL - 554
T3 - Applied Mechanics and Materials
SP - 655
EP - 659
BT - Applied Mechanics and Materials
PB - Trans Tech Publications LTD
ER -