Direct simulation of interface dynamics: linking capillary pressure, interfacial area and surface energy
Data(s) |
2012
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Resumo |
We perform direct numerical simulations of drainage by solving Navier- Stokes equations in the pore space and employing the Volume Of Fluid (VOF) method to track the evolution of the fluid-fluid interface. After demonstrating that the method is able to deal with large viscosity contrasts and to model the transition from stable flow to viscous fingering, we focus on the definition of macroscopic capillary pressure. When the fluids are at rest, the difference between inlet and outlet pressures and the difference between the intrinsic phase average pressure coincide with the capillary pressure. However, when the fluids are in motion these quantities are dominated by viscous forces. In this case, only a definition based on the variation of the interfacial energy provides an accurate measure of the macroscopic capillary pressure and allows separating the viscous from the capillary pressure components. |
Identificador | |
Idioma(s) |
en |
Publicador |
XIX International Conference on Water Resources, Illinois, United States of America |
Fonte |
Computational Methods in Water Resources |
Palavras-Chave | #Pore-Scale modeling; multiphase flow in porous media; Navier-Stokes; simulations; Volume Of Fluid (VOF) method; |
Tipo |
info:eu-repo/semantics/conferenceObject inproceedings |