THE DISTRIBUTION AND CORRELATION OF FLUCTUATING PRESSURES ON THE TEXAS-TECH BUILDING

Full scale pressure measurements at the Texas Tech Field Research Labo ratory have been used to investigate the distribution and correlation of fluctuating pressures on a low rise building. Eigenvector analysis of the covariances indicate that longitudinal and lateral turbulence a re responsible for the majority of pressure fluctuations. However, a s ignificant second eigenvector for flow normal to the roof edges corres ponds with the rollup and discrete shedding of the separation bubble a s a whole. Conditional sampling of peak pressures shows that they are better correlated spatially than the time averaged fluctuations.