Open thermodynamic model for compressible multicomponent two-phase flow in porous media

► Compressible compositional two-phase flow in porous medium was considered. ► New thermodynamic model provided for contrast mobility and pressure relaxation. ► The new thermodynamic model includes equations describing the transport phenomena. ► The new thermodynamic model describes the equilibrium in an open system. ► New space and time independent thermodynamic simulations are extremely fast.