Irrigation and Water Engineering

Irrigation and Water Engineering

Hydraulic investigation of the flow through multiple rectangular Lopac gate in free flow and submerged mode by Flow 3D software

Document Type : Original Article

Authors
Mohammad karamdokht Behbahani 1
Seed Mohsen Sajjadi 1
Javad Ahadiyan 2
1 Department of hydraulic structure, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz,, Ahvaz, Iran
2 Associate professor of Water and Environmental Engineering faculty, Shahid Chamran University of Ahvaz, (SCU), Iran.
10.22125/iwe.2024.437092.1786
Abstract
LOPAC gates are a new type designed to regulate and manage water level fluctuations. In this research, an advanced design of this type of structure is mentioned, in which the gates are installed in pairs next to each other and are called multiple LOPAC gates. This research aims to investigate the effective hydraulic parameters (velocity, energy consumption, and turbulent energy) in the proposed structure in the submergence state with an absorption rate of 70% and compare it with the current in a free state. All the simulations have been modeled with three opening rates of 35, 40, and 45 degrees and at three flow rates of 25, 35, and 45 l/s using Flow3d software. The results showed that in the submerged state, the maximum velocity and depreciation compared to the free state in all experiments decreased on average by 31.55 and 61.04, respectively. The maximum rate of this decrease for all parameters was in the lowest opening rate (35 degrees), and the lowest flow rate was 68.93 and 109.49, respectively. Finally, the investigations show that when using the multiple rectangular LOPAC gates in the free state, large vortices with high power and a wide distribution field can be seen in the channel, which continues to the downstream of the gate. However, when using the multiple rectangular salon valve in the submerged state, the strength of the vortices decreases.
Keywords
LOPAC gate
Velosity
Dissipating Energy
Vortex
Flow-3D
Subjects