A Fully Implicit Hybrid Solution Method for a Two-Phase Thermal-Hydraulic Model

Author:

Mousseau Vincent A.1

Affiliation:

1. Fluid Dynamics Group, T-3, M.S. B216, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

Abstract

This paper will present a hybrid solution algorithm for the two-phase flow equations coupled to wall heat conduction. The partial differential equations in the physical model are the same as in RELAP5. The hybrid solution algorithm couples two solution methods, the solution method currently employed by RELAP5 and an implicitly balanced solution method. The resulting hybrid solution method is both fast and accurate. Results will be presented that show when accuracy and CPU time are considered simultaneously that there are ranges when the hybrid solution algorithm is preferred over the RELAP5 solution method.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference17 articles.

1. Mousseau, V., 2004, “A Hybrid Solution Method for the Two-Phase Fluid Flow Equations,” ICONE12-49536, Proceedings of ICONE 12 2004 12th International Conference on Nuclear Engineering, ASME, New York.

2. Mousseau, V. , 2004, “Implicitly Balanced Solution of the Two-phase Flow Equations Coupled to Nonlinear heat Conduction,” J. Comput. Phys., 200, pp. 104–132.

3. The RELAP5 code development team, 2001, “RELAP5/MOD3.3 Code Manual Volume I: Code Structure, System Models, and Solution Methods,” NUREG/CR-5535 ed., U.S. Nuclear Regulatory Commission, Washington, D.C., (http://www.edasolutions.com/RELAP5/manuals/index.htm)

4. The RELAP5 code development team, 2002, “RELAP5-3D Code Manual Volume I: Code Structure, System Models, and Solution Methods,” INEEL-EXT-98-00834 Rev. 2.0 ed., Idaho National Engineering and Environmental Laboratory, Idaho Falls, (http://www.inel.gov/relap5/r5manuals.htm)

5. Frepoli, C., Mahaffy, J., and Ohkawa, K., 2003, “Notes on the Implementation of a Fully-Implicit Numerical Scheme for a Two-Phase Three-Field Flow Model,” Nucl. Eng. Des., 225, pp. 191–217.

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