Numerical Simulation of Flow Pattern around the Bridge Pier with Submerged Vanes

Document Type: Research Paper

Authors

Department of Water Engineering, University of Tabriz, Tabriz, Iran.

Abstract

Bridges are very important for establishing communication paths. For this reason, it is important to control scour around bridge piers. Several methods have been proposed for scour control. One of the most useful methods is the use of submerged vanes. In the other hand, laboratory circumstances force many considered effective factors to be skipped in the scour phenomenon. In this situation, the importance of using numerical models would appear even more. In this research, numerical simulation of the flow pattern around the piers surrounded by submerged vanes has been carried out. For this purpose, the structure simulated in three dimensions using Fluent software. K-ε turbulence model with VOF and mixture models for multiphase flow simulation were applied. Afterward analysis of the water surface profiles, velocity distribution profiles, and shear tension of the bed in multiple placements conditions including multiple vanes within two flow intensity and two different angles were performed. The results showed that there is a good agreement between numerical and experimental results. The best models in this research were found to be Realizable k-ε turbulence model with VOF multiphase model for water surface profile and velocity distribution profiles. The maximum extracted relative errors for water surface profiles and velocity distribution profiles were 2.23% and 2.92%, respectively. Also, analysis of the counts and placement angles showed that 6 vanes rather to 2 and 4 vanes and also angle of 30 degrees rather to angle of 20 degree performs better in action. The other results of this study, are no change in water surface profiles, reduction of the velocity and the amount of shear stress around the piers in different placement conditions including multiple submerged vanes.

Keywords


  1. Fluent 6.3 User’s Guide. (2006). Fluent Incorporated, Lebanon, N.H.
  2. Ariyan far, e., and shafaei bajestan, m. (2008). “Numerical Study the flow pattern around the cylindrical bridge piers by fluent”. The Fourth National Congress of Civil Engineering, Tehran, Tehran University.
  3. Arvanaghi, h. (2009). “Study the Reduction of Scour the around of bridge piers with rectangular collar by experimental method and by used simulate the flow pattern around it with turbulence models”, PhD Thesis, Department of Water Engineering University of Tabriz.
  4. Asadi partov, a., eghbal zadeh, a., and ahmadi, a. (2012). “The study effect of bridge piers diameter, on the flow pattern in the direct channel by using Flow-3D software” Eleventh Iranian Hydraulic Conference, 16 to 18 November, Urmia University.
  5. Besharati givi, m., and hakim zadeh, h. (2009). “Numerical Study of flow pattern and shear stress around the tapered piers”. Journal of Marine Engineering, Volume VI, Issue 11.
  6. Marelius, F. and Sinha, S.K., (1998), “Experimental investigation of flow past submerged vanes”, J. Hyd. Eng., ASCE, 124(5): 542-545.
  7. Roulund, A., Sumer, B.M., Fredsoe, J. and Michelsen, J., 2002, 3D Numerical Modeling of Flow and Scour around a Pile, Proceeding First International Conference on Scour of Foundations, Texas A & M University, Texas, USA: 795-809.
  8. Yen, C.L., Lai, J.S. and Chang, W.Y., 2001, Modeling 3D flow and scouring around circular piers, Proc.Nati.Sci.Counc.ROC (A), 25(1): 17-26.
  9. Hasan zadeh, Y., hakim zadeh, h., norani, v., and sarveram, h. (2006), “a numerical model to simulate the flow pattern around bridge piers”, Seventh International Seminar of river engineering, Faculty of Science and Engineering water, shahid Chamran University.
  10. Sarveram, h., hasan zade, Y., and hakim zadeh, h. (2008). “Study Flow velocity distribution at bridge pier by using numerical models”, the eighth International Congress of Civil Engineering, Shiraz University.
  11. Shojayi, p. (2009). “Combined effects of vanes and a collar, in reducing Scour of the cylindrical bridges pier”, Master Thesis, Department of Water Engineering University of Tabriz.
  12. Alamayiyan, a., and jafar zadeh, m.r.(2009). “Numerical study of flow conditions in a collision with bridge pier”, thr Eighth International Seminar of river engineering, shahid Chamran University.
  13. Karimi nia, a., and salehi neyshabori, a.a. (2011). “Numerical simulation of phenomenon of back water at the bridge’s pier, Journal of Civil Engineering and mapping, Technical Faculty of Tehran University, Volume 45, Issue 4, Pages 493-487.
  14. Kolali, f., ghodsiyan, m., and rostam abadi, m. (2012), “Numerical simulation of the flow pattern around bridge slant piers, in plane perpendicular to the flow to the right and left” , the ninth international seminar of river engineering, shahid Chamran University.
  15. Hoshmand, d.a., esmaeili, k., keshavarzi, a., and farid hoseini, a. (2013), “Numerical modeling of flow around the bridge pier in meandering beds”, Journal of Soil and Water, Ferdowsi University of Mashhad, Vol. 27, No. 5: 984-973.