iterative aspect
1.The surface panel method has been applied to predict the hydrodynamic performance of highly skewed propeller.The surface of propeller and its trailing vortex are discreted by a number of small hyperboloidal quadrilateral panels with constant source and doublet distribution.For highly skewed propeller,the conventional method generating grid oriented along constant radii will result in a high aspect ratio and a high skewness and a twist panel near the propeller tip on blade surface,which result easily in incorrect calculation results of velovity on blade surface,even in iteration divergence and calculation failure.A “non-conventional grid” is developed to acoid these problems.This grid can effectively solve the problem of the calculation and convergence for highly skewed propeller.The non-linear Kutta condition of equal pressure on upper and lower at the trailing edge is executed by the iterative procedure.By sample calculating,the obtained results are satisfied the experimental data.
