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Ali Akbar Akhtari,Omid Seyedashraf 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
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 thispurpose, two cases are considered, i.e. bends with (one-vane case), and without (no-vane case) middle vanes. To minimize thesystematic errors, the models are also numerically simulated using the Standard and RNG based k-ε turbulence models. Thevalidation 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 ispresented. It is found that middle vanes are efficient to minimize the intensity of secondary currents, super-elevation, and thetendency to flow separation in the convex bank of the bend. According, non-submerged vanes can help to reduce erosion andsedimentation the bend.