De Paoli, M. (2023, November 14). Multiscale modelling of convective mixing in confined porous media [Presentation]. Pore Lab Lecture Series 2023, Oslo, Norway.
Mixing in porous media is relevant to a number of geophysical subsurface flows, such as water contamination, petroleum migration, sea ice formation and geological sequestration of carbon dioxide. In these processes, the fluid carries a dispersed phase (solute) that induces density differences within the fluid domain, resulting in convective motions driving the flow. The flow dynamics in these systems has a multiscale character: diffusion controls solute mixing at the scale of the pores, while large-scale convective structures drive the flow, further enhancing mixing. Therefore, an accurate description of the long-term flow dynamics requires to account for both pore-scale and large-scale effects. In this work, we present our recent findings and modelling strategies of convective porous media flows. We discuss simulations (namely pore-scale, Darcy-scale, and gravity currents) and experiments (Hele-Shaw and bead packs). Finally, we propose simple physical models to explain our findings and we discuss the limitations of the approaches proposed.
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Project (external):
Austrian Science Fund (FWF) European Union’s Horizon Europe research and innovation programme
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Project ID:
Grant J-4612 Marie Sklodowska-Curie grant agreement No. 101062123
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Research Areas:
Computational Fluid Dynamics: 30% Modeling and Simulation: 30% Climate Neutral, Renewable and Conventional Energy Supply Systems: 40%