ИСТИНА

This article compares two approaches for describing flow dynamics on mountain slopes: using a single-velocity multiphase model and a multi-velocity multiphase model. Simulation of experiments of a slushflow in a tank and interaction of the flow with a complex of protective structures using single-velocity and multi-velocity multiphase approaches is carried out. Comparison of numerical solutions with experimental data is made. Both approaches are applied to the calculation of an avalanche in the 22nd avalanche site of the Yukspor Mountain (Khibiny). The range of the avalanche run-out zone and the shape of the avalanche deposits were compared with field data obtained from the results of measuring the real avalanche in this cite. As a result of a numerical experiment, distributions of such parameters of the flow as flow rate, depth, density, viscosity, and bottom shear stress were obtained. The architecture of the nonNewtonianMultiphaseEulerFoam solver is being developed to describe the motion of a multiphase multi-velocity non-Newtonian medium.