COMPUTATIONAL HYDRODYNAMIC SIMULATIONS FOR AN UNDERWATER AXISYMMETRIC HEMISPHERE-CYLINDER HULL-FORM AT INCIDENCE

This contribution presents computational hydrodynamic simulation results for a generic hull shape with an attached short pin-protuberance. This work is a part of a large framework of numerical simulation and experimentation carried out for blunted head-forms of various hemispheric shapes, for determination of aero-hydrodynamic coefficients and their static stability features. Presently results of static axial and circumferential pressure distribution on the surface are presented for a clean hull-form with the pin-protuberance, calculations are made for a selected velocity with varying angle of attacks, under a non-cavitating depth. It is shown that a suitably located short lateral pin has an adequate effectiveness to control pitch maneuver of an underwater hemisphere-cylinder hull-form. A suitable pin-height deployment commensurate to required pitch attitude trajectory correction is found to be a workable idea. Simulation results show that the concept has potential of effective pitch attitude control of the hemisphere-cylinder hull-form