Article Information  
Development of Bed Ridges in Open Channels and their Effects on Secondary Currents and Wall Shear

Keywords: Open Channels, CFD Modelling, Ridges, Boundary Shear Stress, Secondary Currents.

Mehran University Research Journal of Engineering & Technology

Volume 31 ,  Issue 3

Kamran   Ansari , Ashfaque  Ahmed Memon , Naeem  Aziz  Memon ,

References
1. Nezu, I., and Rodi, W., "Experimental Study on Secondary Currents in Open Channel Flow", 21st IAHR Congress, pp. 115-119, Melbourne, Australia, 1985.
2. Prandtl, L., "Essentials of Fluid Dynamics: With Applications to Hydraulics, Aeronautics, Meteorology and other Subjects (English Translation)”, Blackie and Son Ltd., pp. 145-149, 1952.
3. Wang, Z.Q., and Cheng, N.S., "Secondary Flows Over Artificial Bed Strips", Advances in Water Resources, Volume 28, pp. 441-450, USA, 2005.
4. Wang, Z.Q., and Cheng, N.S., "Time-Mean Structure of Secondary Flows in Open Channel with Longitudinal Bed Forms", Advances in Water Resources, Volume 29, pp. 1634-1649, USA, 2006.
5. Nezu, I., "Open-Channel Flow Turbulence and its Research in 21st century", Journal of Hydraulic Engineering, ASCE, Volume 131, No. 4, pp. 229-246, USA, 2005.
6. Nezu, I., and Nakagawa, H., "Cellular Secondary Currents in Straight Conduits", Journal of Hydraulic Engineering, ASCE, Volume 110, No. 2, pp. 173-193, USA, 1984.
7. Nezu, I., Nakagawa, H., and Kawashima, N., "Cellular Secondary Currents and Sand Ribbons in Fluvial Channel Flows", 6th Congress, Asian and Pacific Regional Division, IAHR, pp. 51-58, Kyoto, Japan, 1988.
8. Nezu, I., and Nakagawa, H., "Self Forming Mechanism of of Longitudinal Sand Ridges and Troughs", Proceedings of 23rd IAHR Congress, Volume B, IAHR, pp. 65-72, Delft, The Netherlands, 1989.
9. Nezu, I., and Nakagawa, H., "Turbulence in Open- Channel Flows", IAHR-Monograph, Balkema, Rotterdam, The Netherlands, 1993.
10. Colombini, M., "Turbulence-Driven Secondary Flows and Formation of Sand Ridges", Journal of Fluid Mechanics, Volume 254, pp. 701-719, UK, 1993.
11. Ikeda, S., "Self-Formed Straight Channels in Sandy Beds", Proceedings of ASCE, Journal of Hydraulic Division, Volume 107, No. 4, pp. 389-406, USA, 1981.
12. Nezu, I., Nakagawa, H., and Tominaga, A., "Secondary Currents in a Straight Channel Flow and Relation to its Aspect Ratio", Turbulent Shear Flows 4, Volume 4, Springer, pp. 246-260, New York, USA, 1985.
13. Ansari, K., Morvan, H.P., and Hargreaves, D.M., "A Numerical Investigation into Secondary Currents and Wall Shear in Trapezoidal Channels", Journal of Hydraulic Engineering, ASCE, Volume 137, No. 4, pp. 432-440, USA, 2011.
14. Choi, S.U., Park, M., and Kang, H., "Numerical Simulations of Cellular Secondary Currents and Suspended Sediment Transport in Open-Channel Flows Over Smooth-Rough Bed Strips", Journal of Hydraulic Research, Volume 45, No. 6, pp. 829-840, UK, 2007.
15. Ansys, Inc., Ansys-CFX, Version 11.0 Southpointe, 275, Technology Drive, Canonsburg, PA, USA, 2008.
16. Cokljat, D., "Turbulence Models for Non-Circular Ducts and Channels", Ph.D. Thesis, Department of Civil Engineering, City University, London, England, 1993.
17. Launder, B.E., Reece, G.J., and Rodi, W., "Progress in the Developments of a Reynolds-Stress Turbulence Closure", Journal of Fluid Mechanics, Volume 68, pp. 537-566, UK, 1975.
18. Speziale, C.G., Sarkar, S., and Gatski, T.B., "Modelling the Pressure-Strain Correlation of Turbulence: An Invariant Dynamical Systems Approach", Journal of Fluid Mechanics, Volume 227, pp. 245-272, UK, 1991.
19. Cacqueray, N.D., Hargreaves, D.M., and Morvan, H.P., "A Computational Study of Shear Stress in Smooth Rectangular Channels", Journal of Hydraulic Research, Volume 47, No. 1, pp. 50-57, UK, 2009.