This work presents the results of numerical simulation of steady stratified turbulent gas-liquid flow in a channel under a pressure gradient. The Reynolds-averaged Navier-Stokes (RANS) equations with the Volume of Fluid (VOF) method are used. The influence of turbulence damping near the interface is demonstrated. It is shown that for the considered problem, the use of the VOF approach without turbulence damping gives inaccurate results – a significant underestimation of gas flow rate is observed. To solve this problem, the Egorov correction is used, which provides damping of turbulent viscosity at the interface. It is found that the results obtained with the Egorov correction are sensitive to the mesh size near the interface and to the value of the tunable parameter. When adjusted properly, the Egorov correction provided a good match between the simulation results and experimental data.