Flow Dynamics Around Permeable Spur Dike in a Rectangular Channel


In this study, numerical simulations were performed to investigate the flow and turbulence characteristics of rectangular spur dikes with varying permeability using the Reynolds stress turbulence model developed by three-dimensional (3-D) numerical code FLUENT (ANSYS). In this research, both permeable and impermeable spur dikes were investigated with varying permeability (25%, 37%, 49%, 62%, and 74%) to show its effect on the flow structure. At zh=3.5 cm (where z is the maximum flow depth, and zh is mid of flow depth), 3-D flow velocities and depth-averaged velocities were measured in the horizontal plane. Different velocity profiles and contours, turbulent intensities (T.I), and turbulent kinetic energy (TKE) were analyzed at various selected positions. The findings indicate that an increase in the permeability of the spur dikes up to 74% had a reciprocal effect on the mean stream-wise velocity. Moreover, the recirculation regions created within the impermeable spur dike field decreased with increased permeability of spur dikes. The permeable spur dike head showed a significant decrease in T.I, and TKE compared to the impermeable spur dike. Therefore, to protect the spur dike head from severe turbulent flow during floods and reduce the spur dike field’s recirculation region, a permeable spur dike is preferred.

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The authors are obliged to Higher Education Commission, Pakistan, for contributing CFD software at the Department of Civil Engineering, University of Engineering & Technology, Taxila, Pakistan, which was utilized to conduct this research work.

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Correspondence to Ghufran Ahmed Pasha.

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Iqbal, S., Pasha, G.A., Ghani, U. et al. Flow Dynamics Around Permeable Spur Dike in a Rectangular Channel. Arab J Sci Eng (2021). https://doi.org/10.1007/s13369-020-05205-y

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  • Permeable spur dike
  • Open channel
  • Numerical simulation
  • Flow characteristics
  • Turbulence modeling