University of Tehran Press Iranian Journal of Soil and Water Research 2008-479X 55 10 2024 12 21 Asymmetric hydraulic jump control in sudden expansion channels using a Jet system Asymmetric hydraulic jump control in sudden expansion channels using a Jet system 1903 1920 100094 10.22059/ijswr.2024.377718.669725 FA Afshin Mahjoubi 1. Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran. Center of Excellence of the Network Improvement and Maintenance, Ahvaz, Iran 0009-0003-6610-6254 Javad Ahadiyan Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran. Center of Excellence of the Network Improvement and Maintenance, Ahvaz, Iran 0000-0002-0911-6494 Seyed Mohsen Sajjadi Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran. Center of Excellence of the Network Improvement and Maintenance, Ahvaz, Iran 0000-0002-1085-1023 Seyed Mahmood Kashefipour Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran. Center of Excellence of the Network Improvement and Maintenance, Ahvaz, Iran 0000-0001-7108-828X Journal Article 2024 06 08 The implementation of a jet system at the intersection of the downstream flow from the ogee weir, following the sudden expansion section, effectively controls the asymmetric jump and promotes uniform flow distribution along the channel. This study employed three jet system configurations, each utilizing a minimum number of jets with varying diameters, to investigate the downstream flow conditions under different S and T jumps and tailwater depths. With the introduction of the jet system, the dispersion and magnitude of the parameter (βL) introduced for the S jump exhibited reduced values compared to the T jump. In essence, the jet system functioned admirably as an energy-dissipating and flow-uniforming structure under more critical conditions. The findings revealed a decreasing trend in the momentum parameter (βL.vm2) from the location of sudden expansion (high turbulence) towards the channel end, indicating a reduction in the momentum force acting on the bed. The configuration with the minimum number of jets achieved the most uniform flow distribution, while the jet diameter was found to be dependent on the type of jump (tailwater depth variation). The jump length was significantly reduced compared to the control model with the implementation of the jet system, albeit at the cost of a slight energy loss. The results demonstrate that the utilization of side-facing and opposing jet systems effectively controls the hydraulic jump and promotes uniform velocity distribution in the downstream channel for all tested configurations. The implementation of a jet system at the intersection of the downstream flow from the ogee weir, following the sudden expansion section, effectively controls the asymmetric jump and promotes uniform flow distribution along the channel. This study employed three jet system configurations, each utilizing a minimum number of jets with varying diameters, to investigate the downstream flow conditions under different S and T jumps and tailwater depths. With the introduction of the jet system, the dispersion and magnitude of the parameter (βL) introduced for the S jump exhibited reduced values compared to the T jump. In essence, the jet system functioned admirably as an energy-dissipating and flow-uniforming structure under more critical conditions. The findings revealed a decreasing trend in the momentum parameter (βL.vm2) from the location of sudden expansion (high turbulence) towards the channel end, indicating a reduction in the momentum force acting on the bed. The configuration with the minimum number of jets achieved the most uniform flow distribution, while the jet diameter was found to be dependent on the type of jump (tailwater depth variation). The jump length was significantly reduced compared to the control model with the implementation of the jet system, albeit at the cost of a slight energy loss. The results demonstrate that the utilization of side-facing and opposing jet systems effectively controls the hydraulic jump and promotes uniform velocity distribution in the downstream channel for all tested configurations. https://ijswr.ut.ac.ir/article_100094_03ab17ab1b821248cfc2cbf5b084b589.pdf