Two-phase flow: Models and methods

Abstract A variety of two-phase flow models can be derived following a few basic principles, which are here illustrated which no more generality than is essential. Among the models derived is one already widely used in applications, even though it is ill-posed in the sense of Hadamard. Final assessment of such models remains a distant goal, but will clearly involve numerical solutions; several methods in current use are discussed with a guide to selecting the one appropriate to a particular problem.

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