Abstract This report describes the development of the one-dimensional two-phase flow characteristics analysis code, MINCS. The MINCS has been developed at JAERI (Japan Atomic Energy Research Institute) to provide a computational tool for analyzing not only physical phenomena of two-phase flows but also numerical phenomena in two-phase flow analyses. In MINCS, nine types of two-phase flow models, ranging from a basic two-fluid nonequilibrium (2V2T) model to a simple homogeneous equilibrium (1V1T) model, can be treated under the same numerical solution method. The numerical technique is based on the implicit finite difference method to enhance the numerical stability. The code structure is highly modularized, so that new constitutive relations and correlations can be easily implemented into the code and hence evaluated. A flow pattern can be fixed regardless of flow conditions, and state equations or steam tables can be selected or supplied by users. It is, therefore, easy to solve physical or numerical ben...
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