Solving the six-field governing equations for a system code

Simple models using a single fluid field have been used in initial versions of many system codes. In recent years, more fluid fields have been used for best-estimate code results to improve two-phase flow predictions of the system codes. This paper introduces the numerical equations and solution methods for a next-generation system code that uses 6 fluid fields. It demonstrates the discretization of the mass, momentum, and energy governing equations and the application of matrix solutions that are necessary to implement the 6-field model in a software code.