Computational method for low-Mach-number compressible flows with moving particles and large temperature variations

Abstract

This study proposes a computational method for gas-particle flows with large temperature variations. To efficiently accelerate fully explicit computations of low-Mach-number compressible flows, we use the reduced speed of sound technique for the fractional step method. The direct-forcing fictitious domain method is implemented to perform flow calculations on Eulerian grids in Cartesian coordinates. The proposed method is applied to two types of numerical experiments: single particle sedimentation and multiple particle transport in natural convection. The numerical results demonstrate that the proposed method can reasonably calculate mechanical and thermal interactions between particles and gas flows with large temperature variations.