<abstract xmlns="http://www.w3.org/1999/xhtml"><p>A three-dimensional numerical model was applied to simulate submerged spatial hydraulic jumps (SSHJ) downstream of a symmetric vent that discharges into a wider channel. Simulations were carried out for different aspect ratios of the vent, expansion ratios of vent width to downstream channel width, tailwater depth, and inlet Froude number. Depending on these factors, simulations indicated the formation of steady asymmetric SSHJ, oscillatory asymmetric SSHJ, and steady symmetric SSHJ, consistent with results of previous experimental studies. The model reproduced observed depth downstream of vent, jump length, and velocity profiles along channel centerline for steady symmetric SSHJ. For oscillatory asymmetric SSHJ, simulated oscillation frequencies had Strouhal numbers that varied with expansion ratio and ranged between 0.003 and 0.015. With piers downstream of the vent, oscillatory SSHJ continued to exhibit jet deflections when pier length was relatively short ( ≲ 0.2 of jump length) but became steady asymmetric for longer piers.</p></abstract>

A three-dimensional numerical model was applied to simulate submerged spatial hydraulic jumps (SSHJ) downstream of a symmetric vent that discharges into a wider channel. Simulations were carried out for different aspect ratios of the vent, expansion ratios of vent width to downstream channel width, tailwater depth, and inlet Froude number. Depending on these factors, simulations indicated the formation of steady asymmetric SSHJ, oscillatory asymmetric SSHJ, and steady symmetric SSHJ, consistent with results of previous experimental studies. The model reproduced observed depth downstream of vent, jump length, and velocity profiles along channel centerline for steady symmetric SSHJ. For oscillatory asymmetric SSHJ, simulated oscillation frequencies had Strouhal numbers that varied with expansion ratio and ranged between 0.003 and 0.015. With piers downstream of the vent, oscillatory SSHJ continued to exhibit jet deflections when pier length was relatively short ( ≲ 0.2 of jump length) but became steady asymmetric for longer piers.

Three-dimensional numerical study of submerged spatial hydraulic jumps

Department of Irrigation and Hydraulics, Faculty of Engineering

University of Science and Technology, Zewail City of Science and Technology

Journal of Hydrology and Hydromechanics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Three-dimensional numerical study of submerged spatial hydraulic jumps"}

A three-dimensional numerical model was applied to simulate submerged spatial hydraulic jumps (SSHJ) downstream of a symmetric vent that discharges into a...

Three-dimensional numerical study of submerged spatial hydraulic jumps

Published Online: Aug 10, 2020

Page range: 211 - 222

Received: Feb 12, 2019

Accepted: Apr 28, 2020

DOI: https://doi.org/10.2478/johh-2020-0021

Keywords
Abrupt channel expansion, Submerged spatial hydraulic jump, Asymmetric jump, Oscillatory jump, Computational fluid dynamics

© 2020 Ahmed S. Foda et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Three-dimensional numerical study of submerged spatial hydraulic jumps

Published Online: Aug 10, 2020

Page range: 211 - 222

Received: Feb 12, 2019

Accepted: Apr 28, 2020

DOI: https://doi.org/10.2478/johh-2020-0021

KeywordsAbrupt channel expansion, Submerged spatial hydraulic jump, Asymmetric jump, Oscillatory jump, Computational fluid dynamics

© 2020 Ahmed S. Foda et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Abrupt channel expansion, Submerged spatial hydraulic jump, Asymmetric jump, Oscillatory jump, Computational fluid dynamics