Permeable Triangular Vanes Effect On Turbulent Flow Field

Ahmadi Adli, Sara; Abbaspour, Akram; Hosseinzadeh Dalir, Ali; Parsa, Javad

doi:10.22059/ceij.2024.364855.1957

Permeable Triangular Vanes Effect On Turbulent Flow Field

Articles in Press

Document Type : Technical Notes

Authors

¹ Dept. Water Science and Engineering, Faculty of Agriculture, University Of Tabriz, Iran

² Dept. Water Science and Engineering, Faculty Of Agriculture, University Of Tabriz, Iran

³ Dept. Water Science and Engineering, Faculty of Agriculture, University of Tabriz, Iran

10.22059/ceij.2024.364855.1957

Abstract

In recent years, new river restoration techniques are proposed to improve river ecosystem. In this study, large eddy simulation model (LES) was used to simulate the turbulent flow field around the triangular vanes affected by different permeability rates and vanes angle. Depth-averaged velocity and bed shear stress distributions are affected due to the local effects of the triangular vanes structure, however by increasing the permeability rate, these structures impacts on the flow field have been reduced. On average, maximum bed shear stress values around the simulated vanes are 3.47 times the τ_Mean. Tip velocity near the bed region for the 70% permeable vane with θ =58° and θ =68° is 1.13 times the V_app. Thalweg line alignment affected by the flow field constriction and local flow structure. Due to the triangular vanes cross-sectional opening and smoother flow deflection which varies between 4º-30º, thalweg line generally showed a minor deflection from the channel centerline.

Keywords