Multiphase flow and transport modeling in heterogeneous porous media: challenges and approaches

We review the current status of modeling multiphase systems, including balance equation formulation, constitutive relations for both pressure-saturation-conductivity and interphase mass transfer, and stochastic and computational issues. We discuss weaknesses and inconsistencies of current approaches based on theoretical, computational, and experimental evidence. Where possible, we suggest new or evolving approaches. Copyright (C) 1997 Elsevier Science Limited.