Advances in Numerical Simula tion of Two-Phase (Water and Air)Flow in Unsaturated Zone

This paper reviews recent advances in numerical simulation of two-phase flow and contaminan t transport.Many methods on deriving the primary parameters and the generalization of some physical processes are summarized in two-phase flow simulation.Mea nwhile various solving algorithms to the two-phase flow equations and contaminan t transport equations are reviewed,and t heir merits and shortcomings are summarized.Hence further issues to be solved are put forward.