狭隘流路内の大規模気泡流挙動に関する数値シミュレーション(S19-3 混相流の多次元ビジュアリゼーション(気液・気泡), S19 混相流の多次元ビジュアリゼーション)

概要

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In order to predict the water-vapor two-phase flow structure in a fuel bundle of an advanced light water reactor, a large-scale numerical simulation was carried out using a newly developed two-phase flow analysis code and a highly parallel vector supercomputer. Conventional analysis methods such as subchannel codes need composition equations based on the experimental data. In case that there are no experimental data for the advanced light water reactor, therefore, it is difficult to obtain high prediction accuracy. Then, a new analysis method using the large-scale direct numerical simulation of water-vapor two-phase flow was proposed. This paper, describes the predicted results of a large-scale bubbly flow in a narrow square duct. Regarding the mechanism of bubble coalescence and fragmentation the useful knowledge was obtained.
社団法人日本機械学会の論文
2004-09-04