Abstract:
This paper addresses key challenges in the numerical simulation of gas-particle flows relevant to aerodynamics. Results are presented on the flow structure of the dispersed phase and the associated energy flux to a body surface. Particular emphasis is placed on simulating stochastic phenomena, including inter-particle collisions, the scattering of non-spherical particles upon wall rebound, and particle polydispersity, which are characteristic of real flows, but neglected in classical gas-particle flow theory. The collisional gas of particles within the carrier gas is simulated using a kinetic approach coupled with the direct simulation Monte Carlo (DSMC) method. A three-dimensional model for non-spherical particle-wall collision is implemented, and the particle size distribution in the free stream is described by a log-normal law. Using this approach, the dispersed phase flow structure was investigated for high-speed gas-particle flow over a blunt body (specifically, transverse flow around a cylinder). Energy loss distributions upon impact with the surface are calculated for particles of different shapes. The influence of the shielding effect during particle collisions on the energy loss is also examined.
Keywords:gas-particle flow, particle collision, non-spherical particle scattering, energy loss, DSMC.
Fulltext:
PDF file (1373 kB)
First page:
PDF file