THE NUMERICAL STUDY OF TURBULENT STRUCTURE IN CURVED OPEN-CHANNEL FLOW

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  • Sugiyama Hitoshi
    社団法人 土木学会 宇都宮大学 工学部機械システム工学科
  • Akiyama Mitsunobu
    社団法人 土木学会 宇都宮大学 工学部機械システム工学科
  • Kamezawa Masayuki
    社団法人 土木学会 宇都宮大学大学院 工学部機械システム工学科

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  • 曲がり開水路乱流の構造解析と二次流れ遷移に関する研究
  • マガリ カイ スイロ ランリュウ ノ コウゾウ カイセキ ト 2ジ ナガレ セ

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Abstract

A numerical study of turbulent flow developing in a curved open-channel flow is carried out by using an algebraic stress model. The flow configuration of interest to this study consists of a 180 degree bend of rectangular cross-section preceded and followed by straight duct sections. In the calculation, govering equations are transformed from the physical plane to the calculation plane by boundary-fitted coordinate systems. Calculated results are compared with the experimental data available. Moreover, the transitions from the secondary flow of the second kind to that of the first kind and vice versa are examined. As a result of this numerical study, it is found out that the present method can predict well the characteristic featurs of curved open-channel for secondary currents and streamwise velocity. As for the transition of secondary flow of the first kind, in a straight duct of a bend outlet, its secondary flow is accelerated downstream from bend outlet. After this acceleration, the secondary flow decays and gradually transformes into the the secondary flow of the second kind.

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