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Development of prediction technology of two-phase flow dynamics under earthquake acceleration, 6; Numerical simulation of bubble deformation near wall under accelerating condition

加速度付加時の二相流解析技術の開発,6; 加速度付加時の壁面近傍における気泡形状の数値解析

吉田 啓之 ; 永武 拓 ; 高瀬 和之; 金子 暁子*; 文字 秀明*; 阿部 豊*

Yoshida, Hiroyuki; Nagatake, Taku; Takase, Kazuyuki; Kaneko, Akiko*; Monji, Hideaki*; Abe, Yutaka*

It is not enough for safety operation of nuclear reactors because thermal-fluid safety is not confirmed under the earthquake. For instance, behavior of gas-liquid two-phase flow is unknown under the earthquake conditions. In case of the earthquake, the fluctuation is not only the flow rate, but also body force on the two-phase flow and shear force through a wall of flow channel. The fluctuation of the void fraction is not clear for such complicated situation under the earthquake. Therefore, the behavior of gas-liquid two-phase flow was investigated experimentally and numerically by the present study and a series of related studies. In this study, to develop the prediction technology of two-phase flow dynamics under earthquake acceleration, a detailed two-phase flow simulation code with an advanced interface tracking method TPFIT was expanded to two-phase flow simulation under earthquake conditions. In this paper, outline of expansion of the TPFIT to simulate detailed two-phase flow behavior under the earthquake condition was shown. Moreover, the bubbly flow in a horizontal pipe excited by oscillation acceleration and under the fluctuation of the liquid flow was simulated by using expanded TPFIT. Predicted shape of bubbles near wall was compared with measured results under flow rate fluctuation and structural vibration.

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