2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/57847We present the results of an experimental and numerical investigation of a turbulent flow over a backward-facing step in a channel. Experimental data are visualized using a Particle Image Velocimetry (PIV) device. As a mathematical model we used quasi-hydrodynamic (QHD) equations. We have carried out numerical modeling of the flow for three configurations that were also studied experimentally. The computed flow proved to be non-stationary. The averaged flow in the separation zone is in a good agreement with the experimental data.16 pages, 16 figuresMathematical Physics76A02; 65M06; 35Q35; 76F65text