Response of a turbulent boundary layer to random fluctuations in the external stream

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Abstract
The growth of the turbulent boundary layer is investigated primarily by means of conditional averages in the outer region (i.e., averages inside and outside the bulges limiting the free edge). The main quantities analyzed are: mean velocities, mean velocity gradients, turbulence intensities, Reynolds stresses, kinetic energy balances, skewness and flatness factors of the velocity and Reynolds stress fluctuations, intermittency factor, and indentations of the free edge. Considerable attention is paid to the cumulative straining process of the turbulence by the mean velocity gradient.