Method to detect locally isotropic elements in a water turbulent flow

This article discusses the possibility of improving the reliability of a method for detecting elements of a locally isotropic flow in a turbulent flow of water by introducing, instead of the traditional structural functions, their pulsation modifications. Relative pulsation structural functions were justified, and, on their basis, a predictable expected result was revealed - the absence of elements of a locally isotropic flow in the main part of a real turbulent water flow. The probability of the existence of elements of local isotropy in the laminar boundary layer is suggested, the criterion of which is the ratio of vertical and longitudinal pulsation structure functions equal to 1.3±0.4.