数値解析を用いた矩形容器内自励スロッシングの発生機構の解明 : 第2報, 振動エネルギー変換機構の検討 (<小特集>流体関連振動・騒音等)

概要

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A self-induced sloshing is excited by the flow itself without any other external force. In a rectangular tank having a horizontal plane jet, the 1st mode sloshing grew in a certain condition of the inlet velocity and the water level. The self-induced sloshing in the rectangular tank was simulated, using a two-dimensional numerical simulation code. The simulated results agreed qualitatively with the experimental ones. In this study, a growth mechanism of self-induced sloshing in the numerical simulation was evaluated. The interaction between the free surface motion and the unsteady flow was modeled simply. The oscillation energy (E_n) supplied for sloshing motion was calculated from the pressure and velocity distributions in the tank. The oscillation growth was related to the sign, magnitude and distribution of supplied oscillation energy (E_n). Therefore, the excitation of the simulated self-induced sloshing was quantitatively explained by the present mechanism. The self-induced sloshing was considered to be caused by the nonlinear interaction between the jet and the sloshing motion without inlet-outlet flow. It was clarified that the excitation of self-induced sloshing was dependent on the distribution of the oscillation energy along the jet.
社団法人日本機械学会の論文
1999-07-25