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Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
32 巻, 12 号
選択された号の論文の6件中1~6を表示しています
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論文
  • 新井 和敏, 山本 勝弘, 福本 秀
    原稿種別: その他
    専門分野: その他
    2004 年 32 巻 12 号 p. 721-728
    発行日: 2004年
    公開日: 2005/08/12
    ジャーナル フリー
    To analyze transient free-surface-pressurized flows with entrapped air in a drainage system, a virtual slot model with ceiling have been proposed. Using this model, calculations for a reduced model and the actual size model are carried out to examine a scale effect on the transient flow. The results show that up-scaling the system causes the increase in compressibility of entrapped air so that the rate of pressure rise decreases. It is also confirmed that the partial differential equations for the modified slot model have real eigenvalues and then the initial value problem is well-posed when the velocity difference between air and water is not so large. The increase in the velocity difference yields a system having complex eigenvalues, however the well behaved numerical solutions can be obtained since the frictional term in the defferential equations suppress the numerical instability.
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