Industrial application

5. Industrial application

Water level rise and internal flow in a cylindrical tank induced by rainwater inflow

• In this study, a two-dimensional axisymmetric multiphase flow simulation was conducted to analyze the transient behavior of the water–air interface and the temporal evolution of the internal pressure distribution under rainwater inflow conditions. Based on the Volume of Fluid (VOF) model, the volume fraction analysis revealed that the incoming water descended along the sidewall as a thin film and then reflected at the bottom, generating recirculating flow and free surface oscillations. During this process, the water level did not rise linearly but exhibited low-amplitude unsteady fluctuations, and the formation of air bubbles due to intermittent air entrapment was also observed.