Numerical stability of the mixture drift-flux equations

Citation
Jm. Doster et Jm. Kauffman, Numerical stability of the mixture drift-flux equations, NUCL SCI EN, 132(1), 1999, pp. 90-104
Citations number
11
Categorie Soggetti
Nuclear Emgineering
Journal title
NUCLEAR SCIENCE AND ENGINEERING
ISSN journal
00295639 → ACNP
Volume
132
Issue
1
Year of publication
1999
Pages
90 - 104
Database
ISI
SICI code
0029-5639(199905)132:1<90:NSOTMD>2.0.ZU;2-0
Abstract
Drift-flux models can be used to describe two-phase-flow systems when expli cit representation of the relative phase motion is nor required In these mo dels, relative phase velocity is described by flow-regime-dependent, semiem pirical models. Numerical stability of the mixture drift-flux equations is examined for different semi-implicit time discretization schemes. Represent ative flow-regime-dependent drift-flux correlations are considered, and ana lytic stability limits are derived based on these correlations. The analyti c stability limits are verified by numerical experiments run in the vicinit y of the predicted stable boundaries. It is shown that the stability limits are strong functions of the time-level specification and functional form c hosen for the relative phase velocity. It is also shown that the mixture Co urant limit normally associated with these methods is insufficient for ensu ring a stable numerical scheme.