Sensitivity Analysis of CFD Two-Phase Flow in a BWR Fuel Bundle
2010 (English)Conference paper (Refereed)
The goal of this work was to perform an investigation of the sensitivities of the average outlet void fraction and flow pattern prediction in the fuel assembly on important model parameters. The model sensitivities were examined on the following groups of parameters: numerical parameters (e.g. mesh discretization), operating conditions (input power, outlet pressure, mass flow rate and inlet temperature) and closure models for the interphase momentum (e.g. drag, virtual mass, lift, turbulent dispersion, wall lubrication). The average outlet void fraction was evaluated by the CFD code for the steady-state and model sensitivities were identified.
A significant sensitivity was recognized especially for changes of inlet temperature of coolant and system pressure. Moreover, the turbulent dispersion force and the wall lubrication force had a significant influence on vapor and liquid velocity profiles and also on the distribution of void at the outlet of the fuel assembly.
Place, publisher, year, edition, pages
2010. 1-15 p.
Two-phase flow, Boiling Water Reactor, CFD, Sensitivity analysis
IdentifiersURN: urn:nbn:se:kth:diva-81334OAI: oai:DiVA.org:kth-81334DiVA: diva2:497341
The 8th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS-8)Shanghai, China, October 10-14, 2010
QC 201202132012-02-132012-02-102012-03-20Bibliographically approved