Improved Volume-Of-Solid Formulations for Micro-Continuum Simulation of Mineral Dissolution at the Pore-Scale

We present two novel Volume-of-Solid (VoS) formulations for micro-continuum simulation of mineral dissolution at the pore-scale. The traditional VoS formulation (VoS- ψ ) uses a diffuse interface localization function to ensure stability and limit diffusion reactive surface. main limitation this is that accuracy strongly dependent on choice function. Our first improved (iVoS) divergence flux localize reaction fluid-solid interface, so no required. second ′) with parameter fitted surface area conserved globally. Both methods are validated by comparison experiments, numerical simulations using an tracking method based Arbitrary Eulerian Lagrangian (ALE) framework, VoS- . All implemented in GeoChemFoam, our transport toolbox three benchmark test cases both synthetic real pore geometries considered: 1) calcite post acid injection microchannel experimental comparison, 2) 2D polydisperse disc micromodel different regimes 3) Ketton carbonate rock sample in-situ micro-CT experiments. find iVoS results match accurately obtained ALE method, while leads inaccuracies mostly corrected ’ formulation. In addition, significantly faster than speed-up factor between 2 12.