多次元二流体モデルに基づく自然循環気泡流の数値解析

概要

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One of the next-generation reactors, SBWR (simplified boiling water reactor), is currently under development. It has a large upper plenum surrounded by the so-called "chimney" to keep a driving force of natural circulation. An accurate method for predicting bubble-induced natural circulation is therefore indispensable for the rational design of SBWR. In the present study, the applicability of the multidimensional two-fluid model to bubble-induced transient natural circulation was examined by comparing measured transient flow patterns with calculated ones. The calculation was conducted by coupling a two-dimensional incompressible two-fluid model with available constitutive equations for interfacial drag force, lift force, virtual mass force and viscous force. The 3rd-order new-class TVD scheme was adopted for the convection term of the mass equations to reduce the numerical diffusion of volumetric fractions. As the result, we could obtain good predictions for transient flow patterns. It was also confirmed that the large-scale turbulent flow field induced by the bubble plume can be predicted well without any turbulence model.
社団法人日本機械学会の論文
1994-12-25