Development of a fast transient simulator for gas-liquid two-phase flow in pipes

► We developed a simple and fast transient model for two-phase flow in pipes. ► Developed model is based on local equilibrium using the drift flux model as closure relationship. ► We proposed a modified pressure gradient model to extend model applicability. ► Simple tune up methodology for drift flux correlation is proposed for complex conditions. ► Developed model is tested against available experimental data showing fair agreements.