Study on the influence of voids on high-rise building on the wind environment

Li, Yangluxi; Chen, Lei

where z is the height, κ is the von Karman constant (= 0.40-0.42), u * ABL is the ABL friction velocity and C u is a model constant of the turbulence model (Richards and Hoxey 1993) . z 0 represents the aerodynamic roughness longitude and is estimated as a grass covered terrain which is 0.03 m (J. Wieringa). u * ABL is set as 3.4 m/s according to weather station data at the reference height of 10 m. The standard wall functions by Launder and Spalding (1974) with roughness modification are used (Blocken et al. 2007 ) with regard to the surface of ground. The physicals and particle roughness height k s (m) and the roughness constant C s , are determined by the aerodynamic roughness longitude z 0 (Blocken et al. 2007 ). Such kind of relationship is: