Previous works on the oil/water flow corrosion have focused on the determination of the
transition criteria from water-wetting to oil-wetting. In many situations, the criteria need to be
properly applied along with the calculations of the two phase flow mass and momentum
conservation. In this paper, a unified oil/water flow model was employed to simulate the
transitions from stratified types of flow to dispersed types of flow. In addition, for stratified types
of flows, the curvature of the interface is determined from the minimum of the total system
energy. The predicted curved interface results in different clock positions of corrosion
compared to a flat interface. An example study is given to show how this flow model can be
employed to grade different types of oils in terms of susceptibility to corrosion and to study the
effects of terrain on the corrosion clock positions and how it can be integrated with a corrosion
model for corrosion predictions.