SPATIAL CORRELATIONS OF FLUCTUATING LIFT FORCES ON CROSS SECTIONS OF COMPLETELY SEPARATED FLOW TYPE

Abstract

 The spatial correlations of fluctuating lift forces were evaluated using pressure measurements in the smooth flow and grid turbulences. The effects of flow characteristics and side ratios on spatial correlations are investigated. The spatial correlations of fluctuating lift forces on cross sections with completely separated flow are determined by the vortex scale as well as the vortex intensity. The function which expresses the spatial correlations is proposed, which enables the estimation of spatial distribution of correlation coefficients. The correlation length of fluctuating lift forces can be estimated by drag coefficient at a certain accuracy.