Simulation of multiphase reactive gas transport using smoothed particle hydrodynamics

Abstract

In this work, we introduce an algorithm which describes a flow of multi-gases which are mutually reactive. Two different approaches are employed to describe the gas-gas reaction. In the first model, the gas-gas reaction is represented via stochastic model in which the probability of individual event is related to the kinetics of the reaction, whereas the advection of the fluids is solved by the standard governing equations of smoothed particle hydrodynamics (SPH). In the second approach, individual SPH particle represents mixture of gases, and a set of governing equations that incorporate diffusion and reaction kinetics are established. The models are then applied to simulate a system of homogeneous and inhomogeneous gases which are reactive. With time passing, the state of the system converges to an equilibrium, and the factor of the probability determines how fast it converges. The result agreed well with the given equilibrium constant. The model can be used to describe a system which involves various gas-gas reaction. Also, given the Lagrangian property of SPH, the model can be expanded to various problems which involves complicated reaction between fluid-fluid and fluid-solid, regardless of the phases involved.