COMMIX-1C: A three-dimensional transient single-phase computer program for thermal-hydraulic analysis of single-component and multicomponent engineering systems

Technical Report · Thu Nov 01 04:00:00 EST 1990

OSTI ID:6464483

Domanus, H M; Cha, Y S; Chien, T H; Schmitt, R C; Sha, W T ^[1]

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1. Argonne National Lab., IL (USA)

The COMMIX-1C computer program is an extended and improved version of previous COMMIX codes with four major additions or modifications: (1) a new finite-volume formulation for the mass, momentum, and energy equations to extend the applications to subsonic compressible flows and to make the calculations more robust; (2) a flow-modulated skew-upwind discretization scheme to reduce numerical diffusion; (3) two new matrix solvers for the discretized equations to increase the flexibility and efficiency of numerical computation; and (4) a k-{var epsilon} two-equation turbulence model that is more robust and better validated than those in previous COMMIX codes. In addition, there are numerous smaller modifications that improve overall operation greatly. COMMIX-1C solves the conservation equations of mass, momentum, and energy, as well as the transport equations of turbulence parameters. It is designed to perform steady-state/transient, single-phase, three-dimensional analysis of fluid flow with heat transfer in a single-component or a multicomponent engineering system. The program was developed for the analysis of heat transfer and fluid flow processes in a nuclear reactor system. However, it is designed in a generalized fashion so that, with little or no modifications, it can be used to analyze processes in any engineering equipment or in any system. This document, Volume II (User's Guide and Manual), contains the input instruction, sample problems, flow charts, and description of available options and boundary conditions. 25 figs., 17 tabs.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (USA). Div. of Systems Research; Argonne National Lab., IL (USA)
• Sponsoring Organization: NRC
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6464483
• Report Number(s): NUREG/CR-5649-Vol.2; ANL--90/33-Vol.2; ON: TI91005201
• Country of Publication: United States
• Language: English

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