Numerical Simulation of Compressible Multiphase Flows with Phase Change Using Two-Fluid Approach

The present study is a numerical approach for modelling compressible multiphase flows using two-fluid formulations. Two-fluid indicates two phases where separate governing equations are considered for both phases. The two phases considered can be gas–liquid, gas–solid or liquid–solid. The present study is focussed on combination of liquid and gas. A finite volume solver is developed based on AUSM+-up scheme which is efficient for all-speed computations. Results obtained from the code were validated with literature available for shock tube problems. Effects of initial conditions were also studied for air–water and water–air problems considering the need for extending the two-fluid concept for wide problems in various fields. The practical application of the model is also discussed in the study by considering a major and useful scenario of liquid film cooling from rocket propulsion systems. The results obtained considering phase change from liquid to vapour are also included and discussed towards the final sections.