Experimental and Numerical Investigation on Vanes’ Effects on the Flow Characteristics in Sharp 60° Bends

Ali Akbar Akhtari, Omid Seyedashraf

    Research output: Contribution to journalArticlepeer-review

    Abstract

    © 2017 Korean Society of Civil Engineers and Springer-Verlag GmbH Germany The aim of this paper is to study the effect of middle vanes on the flow structure in open-channels with sharp 60° bends. For this purpose, two cases are considered, i.e. bends with (one-vane case), and without (no-vane case) middle vanes. To minimize the systematic errors, the models are also numerically simulated using the Standard and RNG based k-ε turbulence models. The validation process shows satisfactory agreement between the measured and predicted results with average RMSEs of 0.18 and 4.82, for the water depth and velocity values, respectively. The comparison of the obtained results for the no-vane and one-vane cases is presented. It is found that middle vanes are efficient to minimize the intensity of secondary currents, super-elevation, and the tendency to flow separation in the convex bank of the bend. According, non-submerged vanes can help to reduce erosion and sedimentation the bend.
    Original languageEnglish
    Pages (from-to)1484-1495
    Number of pages12
    JournalKSCE Journal of Civil Engineering
    Volume22
    Issue number4
    Early online date14 Jul 2017
    DOIs
    Publication statusPublished - 1 Apr 2018

    Keywords

    • secondary flow
    • separation
    • sharp bends
    • vanes

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