ON THE INFLUENCE OF V-COMPONENT AND W-COMPONENT TURBULENCE ON ROOF PRESSURES BENEATH CONICAL VORTICES

Wind tunnel experiments have been conducted to examine the influence o f v and pv component turbulence on roof pressures beneath conical vort ices. Mean pressure coefficients for a range of pitch (vertical) and a zimuth (horizontal) flow angles on a specially constructed model were obtained and combined with turbulence intensity measurements to predic t rms fluctuating pressures using the quasi-steady theory. Velocity/pr essure cross correlations were also obtained. Incorporation of the w c omponent turbulence term improved the comparison with measured values but discrepancies remain as a result of the fundamental failure of the quasi-steady theory to deal with flow distortion and building generat ed turbulence. Simultaneous velocity and pressure data collected and a nalysed revealed that extremes in pressure were associated with large excursions in the lateral wind vector.