The effect of slot in reducing scour depth of cylindrical bridge pier using Flow3D software

Document Type : Research Paper

Authors

Department of water structures, Ferdowsi University of Mashhad, Mashhad, Iran.

Abstract

Scouring is one of the most important factors in the destruction of bridge piers. One of the ways to reduce scouring depth is to use a slot in the bridge pier. In this research, the Flow 3D model was used to simulate the effect of a slot with the same dimensions in two positions parallel to the bed and close to the water surface. The tests were performed at two relative speeds of 0.87 and 0.92. Uniform and non-cohesive bed sediments with a geometric standard deviation of 1.4 and an average diameter of 1 mm were used. The results showed that the slot created in the pier of the bridge weakens the eddies around the pier and is effective in reducing scour depth. The slot close to the surface, on average, about 6%, and the slot parallel to the bed, about 26%, are effective in reducing the maximum scour depth compared to the control pier. Also, with the increase of Froud number from 0.376 to 0.380, scour depth has increased by 11% on average.

Keywords

References

  1. Shafaei bajestan, M. (2013). Hydraulic of sediment transport. 4nd ed., Shahid Chamran University of Ahvaz Publications. (in Persian)
  2. Sumer, B.M. and Fredsoe, J. (2002). The mechanics of scour in the marine environment. Advanced series on ocean engineering,vol 17.World Scientific.
  3. Mashahir, M. B and Zarrati, A. R. (2002). Effect of Collar on Time Development of Scouring around Rectangular Bridge Piers. International Journal of Engineering, Transactions B: Applications 25(1©):11-17.
  4. Azhari, A. and Saghravani, S.F. and Mohammadnezhad, B.A., (2010), “3D Numerical modelling of local scour around the cylindrical bridge piers,” XVIII International Conference on Water Resources CMWR 2010 J. Carrera (Ed) CIMNE, Barcelona.
  5. Ghaderi, A., & Abbasi, S. (2019). CFD simulation of local scouring around airfoil-shaped bridge piers with and without collar. Sādhanā, 44, 1-12.
  6. Nazari-Sharabian, M., Nazari-Sharabian, A., Karakouzian, M., & Karami, M. (2020). Sacrificial piles as scour countermeasures in river bridges a numerical study using flow-3D. Civil Engineering Journal, 6(6), 1091.
  7. Hasanzadeh, Y. Kardan, N. and Tamizi, A., (2020). Numerical study of the effect of the distance and the placement of the adjacent piers on the flow pattern and erosion of the sand bed around the bridge piers. Iran Water and Soil Research (Agricultural Sciences of Iran), 51(7), 1753-1737. SID. (in Persian)
  8. Daneshfaraz, R., Abam, M., Heidarpour, M., Abbasi, S., Seifollahi, M., & Abraham, J. (2022). The impact of cables on local scouring of bridge piers using experimental study and ANN, ANFIS algorithms. Water Supply, 22(1), 1075-1093.
  9. kazemian, M., Gohari, S., & shahverdi, K. (2021). The Effect of Height and Vertical Position of Slot on the Reduction of Scour Depth around Cylindrical Bridge Pier in Uniform and Non-uniform Sediments. Journal of Hydraulics, 16(4), 37-48. doi: 10.30482/jhyd.2021.285672.1527. (in Persian)
  10. Sicilian JM, Hirt CW and Harper RP, (1987). FLOW-3D: Computational modeling power for scientists and engineers. Report FSI-87-00-1, Flow Science, Los Alamos, NM.

 

 

 

Files

Share

How to cite

Statistics