ИСТИНА

MUFITS (MUltiphase FIltration Transport Simulator) is a noncommercial developing code intended for analysis of nonisothermal multiphase flows of binary mixtures in porous media. A nonclassical approach for mixture properties prediction is implemented in MUFITS. The approach facilitates simulation of flows subjected to wide pressure and temperature variations, flows close to critical conditions and three-phase nonisothermal flows of binary mixture. Transport equations and Darcy correlation are closed by conditional extremum problem for mixture properties calculation. This problem corresponds to maximum entropy condition in thermodynamic equilibrium. Such approach allows determining not only single-phase states and two-phase states of liquid-gas type as in classical models but also two phase states of liquid-liquid type and three-phase states and allows simulation of the corresponding multiphase flows in porous media.