In recent years, research has been conducted on reducing resistance by adding steps the bottom of high-speed craft. The most significant issue in design multi-stepped planing craft is selection an appropriate step configuration, i.e., geometry, location, and height. This requires a general knowledge hydrodynamic behavior each configuration. Although towing tank test effective method to predict ...

Computational Fluid Dynamics simulations of planing hulls are generally considered less reliable than displacement hulls. This is due to the flow complexity around hulls, especially in bow region, where sprays formed. The recent and constant increasing computational capabilities allows simulating hull features, with more accurate turbulence models advanced meshing procedures. However, mesh-base...

Title of dissertation: Dynamics and Control of Non-Smooth Systems with Applications to Supercavitating Vehicles Vincent Nguyen, Doctor of Philosophy, 2011 Dissertation directed by: Professor Balakumar Balachandran Department of Mechanical Engineering The subject matter of this dissertation relates to the dynamics of non-smooth vehicle systems, and in particular, supercavitating vehicles. These ...

Estimating the forces acting on a high speed craft for structural assessment purposes is challenging due to complex combination of hydrodynamic loads. These include wave pressures, slamming pressures and their load effects at global ‘hull girder’ level. An experimental approach validate use established strip theory methods predicting pressure loads presented here. A series regular seakeeping te...

In this work, the dynamics of a planing hull in regular head waves was investigated using Smoothed Particle Hydrodynamics (SPH) meshfree method. The simulation interaction such vessels with wave trains features several challenging characteristics, from complex physical interaction, due to large dynamic responses, likewise heavy numerical workload. A novel flume implemented within SPH-based code...

There are different methods to reduce drag in high speed hulls. One of these methods is a change in the shape of the body by adding longitudinal side tunnels. In this paper it has been attempted to determine the influence of the tunnel height on hydrodynamic characteristics of the hull to achieving an optimum shape for the tunnel. To achieve this purpose, numerical simulation of the problem has...