Abstract
This article presents numerical simulation of flow in the discharge object with the welded siphon and the free water level. The main numerical tool used in this study is the lattice Boltzmann method combined with the Volume-of-Fluid approach and the Smagorinski LES model. Some aspects of the numerical method are discussed, especially the formulation of the outlet boundary condition. The simulations are carried out with in-house software based on the open-source Palabos framework. Presented results are compared with the CFD simulations, based on the ANSYS CFX software applying the SST and SAS turbulence models and the free-surface flow modeling by means of the Volume-of-Fluid method. The evolution and interactions of main flow structures are analyzed using visualizations and the spectral analysis. All numerical simulations are verified by the experimental data obtained in the hydraulic laboratory with water circuit. A stationary flow regime has been visualized by means of PIV. Both the vertical planes and horizontal planes have been examined, focused mainly on the regions below and behind the siphon outlet. The results show a good agreement of calculated and measured complex flow structures, including time-averaged and instantaneous flow fields.
Highlights
The paper presents the results of numerical simulations of flows in discharge objects of pumping stations
We present selected results of LBM and finite volume-based CFD simulations and compares these results with the experimental data obtained with the particle image velocimetry (PIV) measurements
The goal of this paper was to investigate the usability of free-surface LBM for the simulation of flows in a model discharge object with the siphon
Summary
The paper presents the results of numerical simulations of flows in discharge objects of pumping stations. The main objective of the paper is the investigation of the usability of the lattice Boltzmann method for the case of complex flows with free surface. The presented paper focuses mainly on numerical simulations of two-phase free-flow in an outlet object with a siphon. This is a very complicated case where a stream of water flows into the outlet pool through a siphon with an outlet diffuser, and interacts with still water in the outlet tank and with the tank bottom. The flow field is non-stationary and contains quite complex vortex structures
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