A STUDY ON THE MODELING OF MARINE PROPELLER TIP FLOWS USING BEM

Results of BEM calculations for a new panel arrangement with a "hydrody­ namic tip" are presented and compared with the conventional gridfor two tested propellers: DTRC propeller P4119 and a modified propeller based on DTRC propeller P484S. A rigid wake model and a wake alignment model with roll-up were considered. The results show that the use of "hydrodynamic tip" grids reduces the pressure oscillations inboard of the "hydrodynamic tip". Also, the wake alignment model produces a rather smooth roll-up of the vortex sheet.