We consider the numerical simulation of rigid body motion in multiphase incompressible Navier-Stokes flow. The motion is formulated as an optimization problem and determined by minimizing an objective function in terms of forces and moments acting on the body, constrained by the multiphase Navier-Stokes equations. The corresponding adjoint system and boundary conditions are derived and derivati...

Observations have been made of the growth and collapse of surface and cloud cavitation on a finite aspect ratio hydrofoil oscillating in pitch. The cavitation was recorded using both still and high-speed motion picture photography, and the variations with cavitation number and reduced frequency of oscillation were investigated. The noise generated by the cavity collapse was also measured and an...

The paper describes a simple analytical framework to be used when designing control algorithms for systems of specific type – in which the state derivatives go in feedback as accelerometer signals, and the overall controller explicitly exhibits an algebraic disturbance feedback loop. A simplified hydrofoil craft linear model is treated as an example. The method proposed combines all the approac...

A hydrofoil turbine with simultaneous heaving and pitching is found to have an ability achieve a high power extraction. An OpenFOAM-based numerical model combined non-conformal sliding interface employed study the extraction efficiency of two-dimensional single hydrofoil. The developed validated published experimental results. For Re = 500,000, energy efficiencies are mapped in frequency amplit...

The purpose of this study was to design a hydrofoil which would improve boat performance through enhanced resistance reduction. Commercial CFD code STARCCM+ used solve the Unsteady Reynolds Averaged Navier Stokes Equations for flow around boat. Uncertainity is conducted in order obtain an effective and reliable numerical calculation method. method then validated by direct comparison data at dif...

Unmanned boats have gained a lot of interest in the maritime community during last decade. Most hydrodynamic platforms employed for unmanned are based on traditional relatively simple hulls. In present study, small-scale hydrofoil-assisted (0.6–0.7 m length and 3.5–5.5 kg mass) been developed tested. Design calculations using transverse-strip engineering method with semi-empirical correlations ...