20503 稠密炉心内3次元気泡流構造に関する大規模シミュレーション(大規模数値解析(1),OS11 大規模数値解析)

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 with a two-fluid model need composition equations and empirical correlations based on the experimental data. Therefore, it is difficult to obtain high prediction accuracy when experimental data are nothing. Then, a new two-phase flow analysis method based on the latest computational science was proposed. This paper describes the predicted bubbly flow dynamics in three-dimensional minichannels and the predicted void fractions in the simulated tight-lattice fuel channels. Regarding the coalescence and fragmentation of bubbles the useful knowledge was obtained, and also the high prospect was acquired on the possibility of development of the thermal design procedure of the advanced nuclear reactors with large-scale simulations.
社団法人日本機械学会の論文
2006-03-09