Study of algorithms to enhance vector performance of thermal-hydraulic codes based on a hopscotch scheme

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

OSTI ID:7148002

Majumdar, A; Makowitz, H

Many current reactor thermal-hydraulic codes spend a significant portion of their computational time on recursive direct matrix solutions and consequently are not able to utilize the performance that can be obtained with modern vector computers such as the CRAY X-MP/48 and the CDC CYBER 205. In this paper, the authors present numerical schemes based on the Hopscotch algorithm. These algorithms can be fully vectorized and do not require matrix inversions. The authors have developed a new intermediate iterative stabilizing step and have incorporated it in the basic Hopscotch scheme. Due to this development, the time step size can be increased well beyond the theoretical stability limit of the original Hopscotch algorithm. This new algorithm, EPIC, works significantly faster than a fully implicit direct solution scheme. A one-dimensional, time-dependent, heat conduction equation has been used in this study as an example.

• Research Organization: Idaho State Univ., Pocatello (USA)
• OSTI ID: 7148002
• Report Number(s): CONF-8711195-
• Conference Information: Journal Name: Trans. Am. Nucl. Soc.; (United States) Journal Volume: 55
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220100* -- Nuclear Reactor Technology-- Theory & Calculation
ALGORITHMS
COMPUTERIZED SIMULATION
COMPUTERS
CRAY COMPUTERS
ENERGY TRANSFER
FLUID MECHANICS
HEAT TRANSFER
HYDRAULICS
MATHEMATICAL LOGIC
MECHANICS
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
NUMERICAL SOLUTION
ONE-DIMENSIONAL CALCULATIONS
POWER PLANTS
PROGRAMMING
SIMULATION
THERMAL POWER PLANTS
TIME DEPENDENCE
VECTOR PROCESSING