Tip vortex prediction for contra-rotating propeller using large eddy simulation

This study work mainly focuses on predicting the tip vortex of a contra-rotating propeller (CRP) by using large eddy simulation (LES) and the overset grid method. The open water performance of the CRP is simulated using the LES approach to validate the applicability of the LES approach in hydrodynamics. The results of the simulation agree well with the experimental data. The simulation of the tip vortex is validated using an extensive convergence study with appropriate grid scale and time step. The refined simulation with the LES approach shows adequate feasibility to simulate the tip vortex of the CRP. The formation, evolution, and interaction of the tip vortex are discussed in the current study. The complicated intertwinement of the tip vortices is also investigated.