Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 1 of 1
Full-Text Articles in Nuclear Engineering
Enhancements To The Discrete Generalized Multigroup Method, R. L. Reed, J. A. Roberts
Enhancements To The Discrete Generalized Multigroup Method, R. L. Reed, J. A. Roberts
Symposium on Advanced Sensors and Modeling Techniques for Nuclear Reactor Safety
This work seeks to improve the practicality of the discrete generalized multigroup (DGM) method. The DGM method divides a fine-group energy domain into a set of coarse groups. Fine-group fluxes within each coarse group are expanded in an orthogonal basis, and cross section moments are defined to preserve the reaction rates of the fine-group solution. Previous implementations of DGM suffered from large memory requirements, so this work work explores options to reduce the memory footprint by (a) homogenizing cross-section moments over coarse regions and (b) representing discrete-angle dependence through truncated Legendre expansions. Tests were performed using a 1-D, discrete ordinates …