Investigation of the quasi-steady approach used in transient two-phase flow analysis

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:5155466

Pasamehmetoglu, K O; Nelson, R A

In this paper, implications of the quasi-steady approach to numerical solutions of two-phase flow problems are addressed by the application of basic principles. First, a simple criterion to determine the limitations of the quasi-steady approach is discussed. This criterion is used to determine the minimum time-step size required during the quasi-steady solution. Using this same concept, a method for making truly transient problems artifically quasi-steady is developed. Finally, these concepts are applied to a simple interfacial heat-transfer problem. The numerical instability that results from the quasi-steady approach during the explicit solution of this problem is investigated.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5155466
• Report Number(s): LA-UR-87-4161; CONF-880724-3; ON: DE88004303
• Resource Relation: Conference: 25. American Society of Mechanical Engineers/American Institute of Chemical Engineers/American Nuclear Society national heat transfer conference, Houston, TX, USA, 24 Jul 1988
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
TRANSIENTS
TWO-PHASE FLOW
MATHEMATICAL MODELS
CALCULATION METHODS
HEAT TRANSFER
HYDRAULICS
STEADY-STATE CONDITIONS
ENERGY TRANSFER
FLUID FLOW
FLUID MECHANICS
MECHANICS
220900* - Nuclear Reactor Technology- Reactor Safety