Investigation of Flow Parameters in a Chute Spillway Using FLOW-3D Software

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Document Type : Research Paper

Authors

Department of Water Engineering, Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran

Abstract

This study investigates the hydraulic characteristics of flow, including flow velocity, pressure, and cavitation index, at various inflow rates using FLOW-3D. The results indicate that as flow passes over the ogee spillway, the flow velocity increases, and this upward trend continues gradually along the chute section. Due to the steep slope of the chute section, the maximum flow velocity occurs here and is eventually dissipated upon entering the stilling basin, where dynamic energy is absorbed. Longitudinal pressure distribution along the spillway reveals a reduction in pressure from upstream to downstream, with the most significant decrease occurring at the downstream end of the chute. The maximum flow velocities at inflow rates of 300 (minimum design discharge), 830 (10,000-year flood discharge), and 2270 m³/s (maximum probable flood, P.M.F.) were recorded as 34.25, 41.80, and 44.90 m/s, respectively, at the downstream end of the chute. Additionally, the minimum flow pressures for these discharge rates were 1.23, 1.52, and -5.9 kPa, respectively. Examination of the cavitation index along the channel bed indicated that cavitation occurs in the chute section under all inflow conditions. However, the cavitation index assessment on the sidewalls showed that the ogee, chute, and initial sections of the chute sidewalls remain unaffected by cavitation. Conversely, the cavitation index in the downstream chute sections decreases below the critical threshold, indicating potential cavitation risk in these regions. Therefore, to prevent the occurrence of the destructive cavitation phenomenon, the implement of flow aeration method from the floor and sidewalls of the channel is recommended.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 22 December 2024

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