Experimental and numerical modeling of the simultaneous effect of sluice gate and bump on hydraulic jump

• Published in: Modeling earth systems and environment 2020-12, Vol.6 (4), p.1991-2002
• Main Authors: Mirzaei, Hamid, Tootoonchi, Hossein
• Format: Article
• Language: English
• Subjects: Chemistry and Earth Sciences; Computer Science; Computer simulation; Discharge; Downstream effects; Earth and Environmental Science; Earth Sciences; Earth System Sciences; Ecosystems; Environment; Finite element method; Flow rates; Flow velocity; Hydraulic jump; Hydraulics; Hydrostatic pressure; Math. Appl. in Environmental Science; Mathematical Applications in the Physical Sciences; Mathematical models; Numerical models; Original Article; Physics; Rapid flow; River beds; Sluice gates; Statistics for Engineering; Subcritical flow; Supercritical flow; Tranquil flow; Water engineering; Water levels; Water pressure
• ISSN: 2363-6203; 2363-6211
• DOI: 10.1007/s40808-020-00835-5

Sluice gate has always been used due to their ease of construction, control water level and measure flow discharge. Numerous studies have been carried out on sluice gates. On the other hand, estimating the discharge of flow below sluice gates is a major problem in many water engineering issues. The flow may become supercritical while passing the sluice gate. A bump can be used on the channel bed after the sluice gate in order to accelerate the formation of hydraulic jump phenomenon which converts supercritical flow to subcritical flow, therefore damages and undesirable effects caused by high water pressure in the supercritical flow can be prevented. In this paper, the simultaneous effects of sluice gate and bump in a channel on the formation of the hydraulic jump have been investigated. For this purpose, this phenomenon is modeled in hydraulic laboratory, then, it is simulated by FLOW3D numerical model. The desired conditions are carried out for four different locations of the bump with two different flow rates for each. Also, each experiment conducted on two types of positive and negative channel slope. Finally, a comparison is made between the fine and coarse mesh size on the numerical model to show the sensitivity of hydraulic jump simulation to meshing. The results indicate that as the location of the bump moves downstream of the channel for the positive slope of the channel, the location of the hydraulic jump formation goes downstream, and by decreasing the flow and giving negative slope to the channel, the location of occurrence of hydraulic Jump moves toward upstream of the channel. Also, comparison of different disturbance models indicates the superiority of LES disturbance model in showing jump disturbances compared to other models.