Large-Eddy Simulation of a Hydrocyclone with an Air Core Using Two-Fluid and Volume-of-Fluid Models

Large-eddy simulations have been conducted for two-phase flow (water and air) in a hydrocyclone using Two-Fluid (Euler–Euler) Volume-of-Fluid (VOF) models. Subgrid stresses are modeled dynamic eddy–viscosity model, results compared to those the Smagorinsky model. The effects of grid resolutions on mean turbulence statistics thoroughly investigated. Five block-structured grids 0.72, 1.47, 2.4, 3.81, 7.38 million elements used Hsieh’s 75 mm Mean velocity profiles normal Reynolds with experimental data. Results two-fluid model good agreement VOF A fine mesh axial radial directions is necessary capturing turbulent vortical structure. Turbulence structures dominated by helical vortices around air core. Energy spectra analyzed at different points hydrocyclone, regions low kinetic energy identified attributed stabilizing swirling component.