Study of Streamlines under the Influence of Displacement of Submerged Vanes in Channel Width, and at the Upstream Area of a Cylindrical Bridge Pier in a 180 Degree Sharp Bend

Document Type: Research Paper

Authors

Department of Civil Engineering , Persian Gulf University , Bushehr, Iran.

Abstract

In this paper, submerged vanes were placed at the upstream area of a bridge pier located at the 90 degree angle. Then, using the laboratory equipment, a study of flow pattern was conducted throughout the bend, specifically around the pier and submerged vanes. ADV velocimeter was incorporated in order to help measure 3D velocity components. Submerged vanes were installed at distances of 40 and 60% of the channel width from the inner bank at the upstream area of the bridge; while the distance between the vanes and the pier (5 times the pier diameter) and the distance between the vanes themselves (3 times the pier diameter) were held constant during the experiments. The results demonstrated that moving the submerged vanes towards the outer bank created a vortex at a distance of 5 times the pier diameter from the center of the pier in upstream direction at a distance of 33% of the channel width from the inner bank at a height of 6.9 cm, equal to 30 times the flow depth from the bed.

Keywords


  1. Ye, J. and McCorquodale, J. A. (1998). "Simulation of curved open channel flows by 3D hydrodynamic model" Journal of Hydraulic Engineering, 124(7), 687-698.
  2. Marelius, F. and Sinha, S.K. (1998). "Experimental Investigation of Flow past Submerged Vanes² Journal of Hydraulic Engineering 124(5). 542 – 545.
  3. Johnson, P.A., Hey R.D., Tessier, M. and Rosgen DL. (2001). "Use of vanes for control of scour at vertical wall abutments² Journal of Hydraulic Engineering. ASCE 127(9), 772-778.
  4. Blanckaert, K. and Graf, W. H. (2001). ²Mean flow and turbulence in open-channel bend² Journal of Hydraulic Engineering, 127(10), 835-847.
  5. Soon-Keat, T., Guoliang, Y.u., Siow-Yong, L. and Muk-Chen, O. (2005). "Flow structure and sediment motion around submerged vanes in open channel" Journal of waterway, port, coastal, and ocean engineering, 131(3), 132-136.
  6. Rodríguez, J. F. and M. H. García. (2008). "Laboratory measurements of 3-D flow patterns and turbulence in straight open channel with rough bed² Journal of Hydraulic Research, 46(4), 454-465.
  7. Belcher, B. J. and J. F. Fox. (2009). "Laboratory measurements of 3-D flow patterns and turbulence in straight open channel with rough bed" Journal of Hydraulic Research, 47(5), 685-688.
  8. Naji Abhari, M., Ghodsian, M., Vaghefi, M. and Panahpur, N. (2010). "Experimental and numerical simulation of flow in a 90 degree bend" Flow Measurment and Instrumentation, 21(3), 292-298.
  9.  Kumar, U. C., Kothyari, K, G. and Ranga, R. (2012)"Flow structure and scour around circular componend bride piers - A review" Journal of Hydro-enviroment Research, 6(4), 261-265.
  10. Ataie-Ashtiani, B. and Aslani-Kordkandi, A. (2012). "Flow field around side-by-side piers with and without a scour hole" European Journal of Mechanincs B/Fluids, 36, 152-166.
  11. Das, S., Das, R. and Mazumdar, A. (2013). "Circuation characteristics of horseshoe vortex in scour region around circular piers" Water Science and Engineering, 6(1), 69-77.
  12. Tang, X. and Knight, D.W. (2014). "The lateral distribution of depth-averaged velocity in a channel flow bend" Journal of Hydro-environment Research, 10, 1-10.
  13.  Vaghefi, M., Akbari, M. and Fiouz, A.R. (2015). "Experimental Study of Turbulence Kinetic Energy and Velocity Fluctuation Distributions in a 180 Degree Sharp Bend", 10th International Congress on Civil Engineering, University of Tabriz, Tabriz, Iran.
  14.  Vaghefi, M., Akbari, M. and Fiouz, A. (2016). "An experimental study of mean and turbulent flow in a 180 degree sharp open channel bend: Secondary flow and bed shear stress" KSCE Journal of Civil Engineering, 20(4), 1582-1593.
  15.  Haji Azizi, S., Davood, F., Hadi, A. and Akram A. (2016) "Numerical Simulation of Flow Pattern around the Bridge Pier with Submerged Vanes" Journal of Hydraulic Structures, 2(2), 46-61.
  16.  Ben Mohammad Khajeh, SH., Vaghefi, M. and Mahmoudi, A. (2017). "The scour pattern around an inclined cylindrical pier in a sharp 180-degree bend: an experimental study" International Journal of River Basin Management, 15(2), 207-218.
  17. Karimi, N., Heidarnejad, M. and Masjedi, A. (2017). "Scour depth at inclined bridge piers along a straight path: A laboratory study" Engineering Science and Technology, an International Journal, 20(4), 1302-1307.
  18. Dey, L., Barbhuiya, A. K, and Biswas, P. (2017). "Experimental study on bank erosion and protection using submerged vane placed at an optimum angle in a 180° laboratory channel bend" Geomorphology, 283, 32-40.