Determination of the lifting force and hydrodynamic moment during the motion of a submerged body near the free surface of a liquid

Abstract

Forces and moments on a submerged body by liquid can have a significant effect on the nature of its movement on a little depth. Although it is very important to study these parameters due to their effect on the safety and maneuverability of an underwater vehicle, there are not many theoretical and especially experimental research on this topic. For the first time the authors of the present work have experimentally determined the trim angles of a submerged body model, moving in a near-surface water environment in the experimental basin. Using the ANSYS 19 R2 Academic Research software package, the forces and moments acting on a body of given geometry moving near the free surface of a liquid at different speeds were numerically determined. The influence of the models’ shape, namely the coefficient of fineness of midship section and the block coefficient, on the investigated parameters has been determined.