The purpose of breakwaters is to protect the ports, beaches, or beach facilities from strong waves and storms, as they help establish calm inside port thus achieve safety for ships ease operation. This paper presents an experimental numerical study unconventional alternatives vertical breakwater in order evaluate hydrodynamic performance proposed models. Two cases a semi-submerged were selected...

Fish schools are capable of simultaneous linear acceleration. To reveal the underlying hydrodynamic mechanism, we numerically investigate how Reynolds number $ Re = 1000 - 2000 $, Strouhal St 0.2 0.7 and wavelength \lambda 0.5 2 affect mean net thrust propulsive efficiency two side-by-side hydrofoils undulating in anti-phase. In total, 550 cases simulated using immersed boundary method. The inc...

In rotor dynamics, a traditional way of representing the dynamics hydrodynamic bearings is using stiffness/damping coefficients. It thus necessary to carry out linearization forces around shaft’s equilibrium position. However, have highly nonlinear nature, depending on operating conditions. Therefore, this paper discusses applicability these linear/nonlinear approaches computational model rotat...

In the procedure of designing an underwater vehicle or robot, its maneuverability and controllability must be simulated and tested, before the product is finalized for manufacturing. Since the hydrodynamic forces and moments highly affect the dynamic and maneuverability of the system, they must be estimated with a reasonable accuracy. In this study, hydrodynamic coefficients of an autonomous un...

In this paper, combustion of char in the riser of circulating fluidized bed was modeled using ASPEN PLUS. Since physical and chemical phenomena are involved in the process, the model integrates the two-phase hydrodynamic sub-model with the reaction sub-model derived from the literature. In the proposed model, the fluidized bed is divided into several sections and the behavior of each section wa...

This work gives an overview of the theoretical and experimental achievements of mechatronics applied to fluid film bearings. Compressible and uncompressible fluids are addressed. Rigid and elastic (deformable) bearing profiles are investigated. Hydraulic, pneumatic, magnetic and piezoelectric actuators are used. The ideas of combining control techniques, informatics with hydrodynamic, thermo-hy...

Cetaceans evolved flippers that are unique in both size and shape probably due to selection pressures associated with foraging and body size. Flippers function as control surfaces for maneuverability and stability. Flippers of cetaceans and engineered hydrofoils are similar with streamlined cross-sections and wing-like planforms, which affect lift, drag and hydrodynamic efficiency. Scale models...