A novel flow-oriented discretization scheme for reducing false diffusion in three-dimensional (3D) flows: An application in the indoor environment

► Distribution of air and particles is modelled by a two-phase flow Euler-Euler method. ► A new flow-oriented discretization scheme is employed. ► The convection terms in three directions (3D) are reformulated. ► The performance of the numerical scheme is tested in case of inclined flow. ► The new discretization scheme leads to a significant reduction of false diffusion.