Numerical simulation of propeller-induced vibrating pressure on stern

AbstrcatVibrating pressure on the stern was calculated by simulating source distribution.The Panel method was used to calculate the unsteady hydrodynamic performance of a propeller.Then source was used to get a simulating model of the stern.Hydrodynamic interaction between propeller and hull was achivevd by an iterative calculation.In the process, the hyperboloidal quadrilateral panels were employed to avoid gaps between the panels.The influence coefficients of the panels were determined by Morino's analytical formulations for increasing numerically calculating speed. The pressure Kutta condition was satisfied on the trailing edge of the propeller blade by Netwon_Raphson iterative procedure.Therefore the pressure coefficients of the suction and pressure faces of blade are equal on trailing edge. By solving the fundamental integral equation in panel surface method, the intensities of doublets and sources on the surface of the marine propeller can be obtained.With these doublets and sources the velocity distribution in flow field was achieved to calculate the interaction between the stern and propeller.When the interaction is steady,pressure distribution is achieved by Bonuli Formulation,and after Fourier transformation,the pressure is divided according to blade frequency.The comparison between theoretical result and experimental one shows that the method is effective and useful.