Gas-liquid interfacial flows, such as liquid film flows (also known as wetting flows on walls), are encountered in many industrial processes including absorption, distillation and so on. The present study focuses on the characteristics of wetting flows, in particular the drastic transition between the film flow and the rivulet flow, as the liquid flow rate and the wall surface texture treatments are varied. The three-dimensional gas-liquid interfacial flow simulation based on the volume of fluid (VOF) model is carried out. As the liquid flow rate is increased and then decreased, a hysteresis of the transition between the film flow and the rivulet flow is discovered, which implies that the transition phenomenon depends primarily on the history of the change of interfacial surface shape. Further study on the effect of texture geometry shows that the surface texture treatments added on the wall can impede liquid channeling and increase the wetted area. The simulation results agree well with the experimental results in terms of the gas-liquid interfacial surface shape and the wetted area in the transition region between the film flow and the rivulet flow.