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Mathematical models for simulating the hydraulic behavior of flow deflectors: laboratory and CFD-based study

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Abstract

This study utilized computational fluid dynamics modeling to examine how the location, apex angle of flow deflectors and passageway percentage influenced the depth of scour across various flow conditions. Four types of deflectors were used, including two single perforated deflectors (semicircular and triangular) and two double solid deflectors semicircular and triangular. The Navier–Stokes and continuity equations were discretized using a finite volume and finite difference approach to solve fluid motions, while the RNG κ–ε turbulence model was adopted to model turbulence. The excess bed shear stress resulting from the flowing water was used to determine the bed load model, and the Volume of Fluid technique was used to model free surfaces. Results indicated that the single semicircular perforated deflector was the most effective in reducing the maximum local scour depth. This deflector reduced maximum scour depth by about 76.8%, while the double semicircular solid deflector reduced maximum scour depth by about 75.7%. The triangular perforated deflector and double triangular solid deflector reduced maximum scour depth by about 22% and 71.1%, respectively, when compared to the stilling basin without the deflector. These findings recommend that the single semicircular perforated deflector is the optimal choice for reducing maximum local scour depth.

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Authors and Affiliations

  1. Department of Civil Engineering, College of Engineering, University of Babylon, Babylon, 51001, Iraq

    Imad Habeeb Obead

  2. Department of Civil Engineering, College of Engineering, University of Babylon, Najaf, 54001, Iraq

    Ahmed Rahim Sahib

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  1. Imad Habeeb Obead
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  2. Ahmed Rahim Sahib
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Correspondence to Ahmed Rahim Sahib.

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Obead, I.H., Sahib, A.R. Mathematical models for simulating the hydraulic behavior of flow deflectors: laboratory and CFD-based study. Innov. Infrastruct. Solut. 8, 213 (2023). https://doi.org/10.1007/s41062-023-01170-1

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