Accurate Treatment of Material Interface Dynamics in the Calculation of One-Dimensional Two-Phase Flows by the Integral Method of Characteristics

[+] Author and Article Information
Y. W. Shin

Components Technology Division, Argonne National Laboratory, Argonne, Ill. 60439

A. H. Wiedermann

ATResearch Associates, Inc., Glen Ellyn, Ill. 60137

J. Pressure Vessel Technol 106(3), 261-269 (Aug 01, 1984) (9 pages) doi:10.1115/1.3264341 History: Received June 29, 1983; Revised May 16, 1984; Online November 05, 2009


Accurate numerical methods for treating the junction and boundary conditions needed in the transient two-phase flows of a piping network were published earlier by us; the same methods are used to formulate the treatment of the material interface as a moving boundary. The method formulated is used in a computer program to calculate sample problems designed to test the numerical methods as to their ability and the accuracy limits for calculation of the transient two-phase flows in the piping network downstream of a PWR pressurizer. Independent exact analytical solutions for the sample problems are used as the basis of a critical evaluation of the proposed numerical methods. The evaluation revealed that the proposed boundary scheme indeed generates very accurate numerical results. However, in some extreme flow conditions, numerical difficulties were experienced that eventually led to numerical instability. This paper discusses further a special technique to overcome the difficulty.

Copyright © 1984 by ASME
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