Scales in Turbulent Motions

This paper reviews some of the classical dimensional principles used in fluid mechanics to predict the characteristic scales of turbulent flows. The reasoning makes largely reference to the celebrated Kolmogorov theory we first briefly recall. Data obtained in two wind tunnel experiments are then used to exemplify the concepts and to provide typical values of the different length and time scales involved in wind tunnel experiments. Measurement techniques and their role in the scientific research in fluid mechanics are then succinctly commented.