The purpose of the paper is to present a simulation concept, which is able to take into account the most important phenomena that occur in the high-pressure swirl injector fuel flows, typical for the direct gasoline injection (DGI) engines. Used are two- (air, gasoline liquid) and three-phase (air, gasoline liquid and vapor) flow models. The most important characteristics of the flow were predicted. Both two- and three-phase flow simulation results show the formation of a thin conical sheet with an air core. Vaporization in the air core due to pressure drop below the saturation conditions was predicted in the three-phase flow simulation.