This paper considers the application of the block-hierarchical approach to the study of the
working process of the water passage of a radial-axial reversible hydraulic machine based
on mathematical modeling. The advantages and features of this approach on the system of
multilevel description of the working process are determined. It has been determined that the
choice of the most effective model is influenced by the design stage of the water passage
and the tasks that are set before designer. The general structure of the mathematical …