“…In comparison, the semiimplicit scheme relaxes the constraint on time stepping and meanwhile achieves enhanced stability, which makes it more extensively used than the fully explicit scheme in practice. Considering that the pressure information propagates more rapidly than the saturation information, the implicit pressure and explicit saturation (IMPES) scheme [2,3,4,5,6,7,8] was proposed by solving the linear pressure equation implicitly and nonlinear saturation equations explicitly. Analogous to the IMPES method, the implicit pressure and explicit concentration (IMPEC) scheme adopts a similar strategy to solve compositional flow problems [9].…”