Abstract An alternative twin rudder system known as the Gate Rudder© has been applied to newbuild vessels and an existing ship with aim improve their hydrodynamic performance reduce greenhouse gas emissions. The consists of two asymmetric cross-sections L-shaped blades located either side a propeller. generate thrust (duct effect) from propeller ship-included flow. Initially, forces moments sin...

In the present study, diffraction and radiation problems of water waves by a surface-piercing porous cylindrical body are considered. The idea conceived is based on capability structures to dissipate wave energy minimize environmental impact, developing attenuation protection. context linear theory, three-dimensional solution eigenfunction expansion method developed for determination velocity p...

The second post-Newtonian hydrodynamic equations are analyzed within the framework of a plane wave solution. for mass and momentum density coupled with six Poisson Newtonian gravitational potentials. Perturbations basic fields potentials from background state by assuming representations lead to dispersion relation where Jeans instability condition emerges. influence first approximations on is d...

The profile of sealing land is a sensitive factor affecting the thermo-hydrodynamic lubrication characteristics slipper pair. In this paper, non-uniform wear running surface under was presented and defined as boundary condition. Based on finite volume method successive over-relaxation iteration method, discrete numerical model coupled with temperature, pressure, thickness oil film constructed. ...