RT - Journal Article T1 - Investigation of convection-diffusion process in a two-phase air-water flow using Smoothed Particle Hydrodynamics JF - mdrsjrns YR - 2017 JO - mdrsjrns VO - 17 IS - 2 UR - http://mme.modares.ac.ir/article-15-10503-en.html SP - 115 EP - 125 K1 - Smoothed Particle Hydrodynamics K1 - Two-phase flows K1 - Convection-Diffusion problem K1 - Air-bubble rising AB - In this paper, the convection-diffusion process in a two-phase air-water flow is investigated. Two-phase flows of air and water are important and are widely used in the industrial applications. Simulation of such a flow needs a proper understanding of the interface between two phases where these is a change in fluids properties. Smoothed Particle Hydrodynamics (SPH) is a fully Lagrangian and meshless method which can simply detect the interface of multiphase flows. Here, we develop the open-source SPHyiscs2D code into two phase and implement the convection-diffusion equation by looking carefully at surface tension forces. To validate, first the still-water problem is investigated to ensure that the hydrostatic pressure at the interface is predicted and then the dam-break problem on an infinite bed is compared with the available experimental data. Results show that the combination of surface tension formulations and an additional artificial force gives a better result. Finally, the convection-diffusion process and the concentration distribution are shown for the air-bubble rising problem for different diffusive coefficients. It will be shown that the SPH method is a useful tool for studying multiphase flows and convection-diffusion processes. LA eng UL http://mme.modares.ac.ir/article-15-10503-en.html M3 ER -