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Lattice Boltzmann pseudopotential multiphase modeling of transcritical CO<inf>2</inf> flow using a crossover formulation

Abstract:

This report summarizes our recent implementation of a crossover formulation in the lattice Boltzmann method and its application in modeling transcritical CO2 sequestration in water-saturated porous media. A crossover enhancement of the Peng-Robinson equation of state increases the accuracy in pbkp_redicting fluid properties in transcritical conditions, which is relevant in modeling CO2 sequestration. The crossover formulation leads to the pbkp_rediction of liquid-vapor coexistence curves closer to experimental data. The formulation was validated with several tests and applied to model the displacement of H2 O with CO2 in a homogeneous porous medium in multiple conditions. This investigation provides a promising strategy for improving the accuracy of the lattice Boltzmann method in modeling transcritical CO2 sequestration in aquifers using realistic transcritical conditions.