Author(s): Pramit De; Dhrubajyoti Sen

Linked Author(s):

Keywords: Submerged wall jets; Sinusoidal corrugations; Reynolds averaged Navier Stokes; Volume of fluid; Flow Dynamics; Local Scour

Abstract: Researchers have previously explored the possibilities of using roughened aprons to reduce the scouring extents of mobile beds downstream of submerged wall jets. This study compares the flow characteristics of a submerged wall jet with finite tailwater depth, originating from a sluice gate opening over smooth and corrugated horizontal aprons, using two-dimensional (2D) Reynolds averaged Navier Stokes–volume of fluid (RANS-VOF) simulations. The interaction between the submerged wall jet and the corrugated apron differs significantly from that of a smooth bed, highlighting how corrugations affect velocity and flow patterns. The analysis focuses on the vorticity characteristics and the mean velocity decay of the wall jet over various wavy corrugated beds to better understand the flow dynamics in relation to the geometric features. The corrugated aprons lead to a much more rapid decay of the wall jet, which is evident by the flow dynamics. This report also presents some preliminary results of experiments on local scour, which show a significant reduction in the scour hole volume and maximum scour depth downstream of corrugated beds compared to smooth beds. The overall analysis includes insights from numerical simulations investigating the flow physics and the findings from physical experiments on scour development, revealing that the introduction of sinusoidal corrugations as macro-roughness effectively resists the submerged wall jet, leading to its accelerated decay and a reduction in downstream scour extent.

DOI: https://doi.org/10.64697/978-90-835589-7-4_41WC-P1705-cd

Year: 2025