On multicomponent gas diffusion and coupling concepts for porous media and free flow: a benchmark study

Multicomponent gas transport in porous media and at the interface between free flow occurs a wide range of technical environmental systems. Modeling tools are required for quantitative description such coupled compartments. We present benchmark study to compare different diffusion models as well coupling concepts employed multicomponent medium/free-flow interface. The problems allowed us two (Fickian Maxwell-Stefan formulations) predicting behavior mixtures presence flow. examples highlighted importance interaction diffusing components by applying formulation, impact velocity on migration under diffusion- advection-dominated conditions. were solved using simulation tools, incorporating describe physics processes. In COMSOL Multiphysics, we implemented single-domain Brinkman approach, whereas DuMuX simulator used two-domain approach with Navier-Stokes equation Darcy’s law medium. Also, formulation was codes. Despite modeling concepts, mathematical descriptions numerical schemes simulators, their outcomes demonstrate excellent agreement all problems, capability reproduce results previous experimental studies.