Description du projet
La modélisation du transport pour un mélange local dans des milieux granulaires
La modélisation du transport réactif des solutés dans des milieux poreux est appliquée à plusieurs problèmes comme le transport de polluants ou l’énergie géothermique. Toutefois, le large éventail d’échelles auxquelles les écoulements de fluides sont régis par des hétérogénéités physiques dans des milieux poreux empêche le développement de modèles de transport réactif pratiques et précis. Le processus de mélange local contrôle la capacité des réactifs situés à proximité à favoriser les réactions chimiques. Néanmoins, les modèles de transport réactif à l’échelle du continuum omettent généralement le rôle du mélange à l’échelle du pore. Le projet MixUp des Actions Marie Skłodowska-Curie développera une approche de transport révolutionnaire mise à l’échelle pour le mélange et la réaction capable de rendre compte avec précision du mélange local dans les milieux granulaires et d’être facilement intégrée au sein de modèles et de codes réactifs existants à l’échelle du continuum.
Objectif
"Modeling reactive transport of solutes in aquifers and other porous formations is a field with key applications for a wide range of problems in contaminant transport, soil remediation, subsurface CO2 sequestration and geothermal energy. The wide range of scales at which fluid flows are governed by physical heterogeneities in porous media is a major obstacle in developing practical and accurate reactive transport models. The local mixing process governs (and may limit) the ability of reactants that are at close distance to establish direct contact and enable chemical reactions. However, continuum-scale reactive transport models typically neglect the role of mixing at the pore scale (and any other model-unresolved scales). This is partly because the precise link between a porous medium's micro-structure and its resulting mixing behavior has not been rigorously established yet; but also due to a lack of robust, generalized models and tools to account for local mixing and its upscaled effects. The goal of MixUp is to develop a first-of-its-kind upscaled transport modeling approach for mixing and reaction, founded on the underlying micro-scale physics, that can accurately account for local mixing in granular media, and that can be readily integrated within existing continuum-scale reactive models and codes. This will be attained by taking advantage of the recent ""A Closer Look"" simulation dataset, which contains the results of high-resolution Computational Fluid Dynamics simulations of pore-scale transport and mixing in granular media columns with an unprecedentedly large domain size, and also features different degrees of grain-size variability. A first implementation of the upscaled approach will be used to evaluate the importance of local mixing for reactive processes within mountain hillslopes."
Champ scientifique
- natural sciencesphysical sciencescondensed matter physicssoft matter physics
- natural sciencesphysical sciencesclassical mechanicsfluid mechanicsfluid dynamicscomputational fluid dynamics
- engineering and technologyenvironmental engineeringenergy and fuelsrenewable energygeothermal energy
- natural scienceschemical sciences
Mots‑clés
Programme(s)
- HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA) Main Programme
Régime de financement
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European FellowshipsCoordinateur
35042 RENNES
France