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• W2030221331 startingPage "293" @default.
• W2030221331 abstract "We present a novel hybrid (or multiphysics) algorithm, which couples pore-scale and Darcy descriptions of two-phase flow in porous media. The flow at the pore-scale is described by the Navier–Stokes equations, and the Volume of Fluid (VOF) method is used to model the evolution of the fluid–fluid interface. An extension of the Multiscale Finite Volume (MsFV) method is employed to construct the Darcy-scale problem. First, a set of local interpolators for pressure and velocity is constructed by solving the Navier–Stokes equations; then, a coarse mass-conservation problem is constructed by averaging the pore-scale velocity over the cells of a coarse grid, which act as control volumes; finally, a conservative pore-scale velocity field is reconstructed and used to advect the fluid–fluid interface. The method relies on the localization assumptions used to compute the interpolators (which are quite straightforward extensions of the standard MsFV) and on the postulate that the coarse-scale fluxes are proportional to the coarse-pressure differences. By numerical simulations of two-phase problems, we demonstrate that these assumptions provide hybrid solutions that are in good agreement with reference pore-scale solutions and are able to model the transition from stable to unstable flow regimes. Our hybrid method can naturally take advantage of several adaptive strategies and allows considering pore-scale fluxes only in some regions, while Darcy fluxes are used in the rest of the domain. Moreover, since the method relies on the assumption that the relationship between coarse-scale fluxes and pressure differences is local, it can be used as a numerical tool to investigate the limits of validity of Darcy’s law and to understand the link between pore-scale quantities and their corresponding Darcy-scale variables." @default.
• W2030221331 created "2016-06-24" @default.
• W2030221331 creator A5058591095 @default.
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• W2030221331 date "2013-10-01" @default.
• W2030221331 modified "2023-09-23" @default.
• W2030221331 title "Hybrid Multiscale Finite Volume method for two-phase flow in porous media" @default.
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• W2030221331 doi "https://doi.org/10.1016/j.jcp.2013.05.019" @default.
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