Numerical Simulation of Propeller Tip Vortex Cavitation Based on an Adaptive Mesh Refinement Method
The Computational Fluid Dynamics(CFD)simulation combined with an adaptive mesh refinement(AMR)method is used to investigate the propeller tip vortex cavitation(TVC)problem for open water and hull-behind conditions.The main focus was the effect of mesh size on the simulation accuracy of TVC.Open water calculation results showed that TVC was strongly sensitive to mesh size,and the adopted Q-criterion based AMR method effectively improved TVC simulation and gave a much longer TVC trajectory compared with the results using a static mesh refinement region.Therefore,the computed TVC based on AMR method was in good agreement with model test results.The flow details,vorticity,and pressure distribution downstream from blade tips,showed that the simulation with AMR method gave a stronger vorticity and lower pressure inside the tip vortex core.The adopted AMR method was extended to a TVC simulation at hull-behind condition,and it gave a good prediction of the TVC compared with the model test result,implying its good adaptability for non-uniform inflow.
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