Author(s): Azin Amini; Martin Wickenhauser; Azad Koliji

Linked Author(s): Azin Amini

Keywords: Water storm shaft; Pumping station; Tree-dimensional numerical model

Abstract: The Al-Salam Pumping Station will be constructed in the framework of Jeddah Storm water and Masterplan (JSWM) in Saudi Arabia. The station discharges the incoming flow from the Al-Salam storm tunnel to the Red Sea. The station structure includes a circular deep wet well (22m diameter and 20 m depth below the ground) equipped with six pumps, one weir feed channel (63 m length, 10 m width) equipped with four pumps, two pumping channels and two gravity discharge channels. Simulations have been carried out using CFD numerical modelling (Flow 3D) to verify the hydrodynamic performance of such a structure. The hydraulic analysis focuses on aspects such as flow velocity fields and distribution, water elevations, shear stresses and vorticities. The numerical simulations allowed to verify the hydraulic operation and design/performance criteria. These criteria include the allowable freeboard, minimum shear stress to transport sand particles and organic materials, the critical submergence of pumps for different hydrological scenarios, and finally the pre-swirl angle of the pumps. Simulation results show uniform velocity distribution in the wet well as well as in the pumping channels and provide plausible information to confirm design criteria fulfilment.

DOI: https://doi.org/10.3850/IAHR-39WC2521711920221013

Year: 2022