Experimental investigation of space-time correlation in the atmospheric surface layer

Abstract eng:
We investigated the space-time correlation of streamwise velocity in the high Reynolds number atmospheric surface layer (ASL) using multipoint synchronous field observation array. The experimental results show that the iso-correlation contours of space-time correlations have an elliptical shapes rather than straight lines, which suggests that, instead of Taylor hypothesis, the elliptic model [1] is more suitable for describing the space-time correlation for the streamwise velocity in the ASL. It relates the space-time correlation to the space correlation via convection velocity U and sweeping velocity V. The further experimental results suggest that U is basically equal to

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