Flow of interpenetrating material phases

A previously described numerical technique for the solution of multiphase flow dynamics problems is here both simplified and extended. The simplification cuts down slightly on the momentum coupling among fields, allowing for considerable reduction in complexity of the formulation. The extensions include the capability for compressibility in each material phase, the addition of more interpenetrating fields, and the allowance for motion of a liquid or vapor through a close-packed field of particles. The technique is illustrated by computer-generated plots from a time-varying three-field calculation in a cylindrically symmetric configuration.