Numerical Simulation of Dusty Gas Flows in Aerodynamics

This paper addresses several problems in the numerical simulation of dusty gas flows pertaining to aerodynamics. We present results of an investigation of the flow structure of the dispersed phase and the energy flux toward the surface of a body. Primary attention is given to simulating random phenomena—particle collisions, scattering of nonspherical particles upon rebound from the surface, and particle polydispersity—which are characteristic of real flows but are not accounted for in the classical dusty gas flow theory. A kinetic model and the direct simulation Monte Carlo method are used to calculate the so-called “collisional gas” of particles within the carrier gas flow. A three‑dimensional model of nonspherical particle–wall collision is employed. The particle size distribution in the unperturbed flow is described by a log–normal law. Within the framework developed, the flow structure of the dispersed phase is investigated for a high‑speed dusty gas flow over a blunt body; i.e., a transverse flow around a cylinder is considered. The energy–loss distribution during collisions with the surface is calculated for particles of various shapes. The influence of the schielding effect during particle collisions on energy loss is examined.