Effect of mass rebalancing on COMMIX-1B iterative solution schemes

Conference · Thu Jan 01 04:00:00 EST 1987 · Trans. Am. Nucl. Soc.; (United States)

OSTI ID:5579795

King, J B; Anghaie, S; Domanus, H M

COMMIX-1B is a single-phase, three-dimensional, thermal-hydraulics code that can be used to analyze both steady-state and transient problems. The code utilizes both the conjugate gradient (CG) and successive overrelaxation (SOR) methods to solve the system of three-dimensional discrete pressure field equations. The method of mass rebalancing is used to accelerate the convergence of these iterative solution schemes. In this method, fluid cells in the computational domain are grouped into a few regions that are called rebalancing regions. Next, pressures of all newly formed computational cells are corrected by a constant amount in such a way that the conservation of mass is presented. After providing such a large-scale and computationally inexpensive corrective to pressure field equations, the fine pressure adjustment is to be done by using either CG or SOR techniques. This paper discusses the effect of mass rebalancing on the convergence of these iterative solution schemes.

• Research Organization: Oregon State Univ., Corvallis
• OSTI ID: 5579795
• Report Number(s): CONF-870601-
• Conference Information: Journal Name: Trans. Am. Nucl. Soc.; (United States) Journal Volume: 54
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220100* -- Nuclear Reactor Technology-- Theory & Calculation
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
C CODES
COMPUTER CODES
COMPUTERIZED SIMULATION
ENERGY TRANSFER
FLUID MECHANICS
HEAT TRANSFER
HYDRAULICS
ITERATIVE METHODS
MASS BALANCE
MECHANICS
SIMULATION
THREE-DIMENSIONAL CALCULATIONS