Unsteady Cavitation and Cryogenic Flow Cavitation around 2D Body

Abstract

Since the coupling of cavitation modeling with turbulent flow is the difficulty topic, a numerical simulation for two phase flow remains as one of the challenging issues in the society. This research focuses on the development of numerical code to deal with incompressible two phase flow around 2D hydrofoil combined with cavitation model suggested by Kunz et al. with k-epsiv turbulent model. The simulation results are compared to experimental data to verify the validity of the developed code. Also, the comparison of the calculation results is made with LES results to evaluate the capability of conventional turbulence models such as k-epsiv model. The calculation results show very good agreement with experimental observations even though this code can not grasp the small scaled bubbles in the calculation whereas LES can hold the real physics. Also, the calculation of cavitation in cryogenic fluid was done by implementing the temperature sensitivity in government equations. Even though the results show good agreement with previous calculation results, further research will be needed to account for real physics of the formation of cavitation in cryogenic fluid due to temperature sensitivity. This code will be further extended to 3D compressible two phase flow for the study on the fluid dynamics around inducers and impellers in turbo pump system.