... operating in open water. We show that the wake topology is similar to that observed in open water only for low-loading conditions. For mild blade loading, the free surface's presence seems to stabilize the flow. On the contrary, for high blade loading, the mutual interaction between the vortex system...

... are linked to the hydrodynamic interaction with the propeller wake, whereas the higher values are ascribed to the rudder natural mode of vibrations. Moreover, the identification of the specific contribution of the tip and hub vortex to the rudder deformation is presented. INTRODUCTION Marine rudder...

... a significant impact on the open water performance, vortex structures, as well as the instability of the wake evolution. In this paper, based on the Ka4-70 propeller and 19A duct model, simulations of open water propeller and a ducted propeller with tip clearance d = 1.01mm are carried out. Firstly, open...

... ABSTRACT Floating offshore platforms mostly consist of a single cylinder or multi-cylinder, which is susceptible to vortex-induced motions (VIM) in the ocean current. In this paper, numerical simulations are performed to study the VIM of four rigidly connected cylinder at a large reduced...

... vortex shedding occurs. When the vortex shedding frequency of the vortex is close to the natural vibration frequency of the platform, resonance will occur, which will induce large dynamic response of the platform and cause serious fatigue damage to the structure. The dynamic response of the platform...

... ABSTRACT In this paper, the dynamic response of a self-induced elastic deformation of a beam attached to a cylinder in channel flow were studied in the two-dimensional flow regime. We explored the response of the elastic deformation of a beam for a wide range of geometric features. The vortex...

...-rope-drum wave power generation device was calculated by using computational fluid dynamics method and fluent combined with C++ programming. The motion of the floating body was realized by using dynamic grid, and the structural heave and sway curves were obtained. In addition, the vortex induced motion...

... Abstract Prediction of hydrodynamic forces acting on a ship hull is important to predict ship manoeuvrability precisely. In this paper, SQCM (Source and Quasi Continuous vortex lattice Method) is introduced to predict lateral force and yawing moment acting on a ship hull representing the shape...

.... The paper compares the simulation results of cylinder and rod-NACA0012, analyzes the difference of vortex distribution using Liutex and turbulent energy distribution in the flow field. Besides, this paper analyzes the linear and nonlinear terms of SPL. Several sound pressure probes are arranged around...

... with a certain the vortex shedding frequency of the flow around a bluff body. In this frequency obeying the Strouhal law, i.e., the Strouhal number study, the Strouhal number for a near-wall circular cylinder fully immerged in a shear flow was experimentally investigated within the St = fsD /U , in which fs...

... Abstract Theoretically, the vortex–induced vibration, caused by the trailing vortex shedding in flows around the blunt body, is probably major reason for structural fatigue damage. An effective way in engineering is to attach a thin plate in the wake of the blunt rigid body, that can reduce...

... Abstract Vortex–Induced Vibration (VIV) is an important problem that can be seen in offshore structures such as drilling riser. VIV occurred due to synchronization (lock–in) of the vortex shedding and natural frequency of the structure. The lock–in phenomenon is normally observed...

... Abstract In this paper, the forced vibration and vortex induced vibration of a cylinder under the combined action of uniform flow and oscillatory flow were numerically simulated by using dynamic grid technology. The effects of the distance between the cylinder and the wall and the number...

... columns. Therefore, they are subjected to vortex-induced motions (VIM) when exposed to currents. From an academic point of view, the detailed hydrodynamics of how vortices are generated around a surface-piercing truncated and interact with free surface are poorly understood and should be further studied...

... of the cylinder is considered to figure out how the focused wave interact with moving cylinder as well as how speed and distance affect the result. The correlation between vortex shedding and free surface is also discussed. INTRODUCTION With the development and utilization of ocean resources, there are more...

.... The Large Eddy Simulation (LES) turbulence model was used for numerical simulation. The hydrodynamic performance of the vane wheel at different rotational speed was calculated. At the same time, the vortex shape, pressure distribution and the flow field behind the propeller and vane wheel were analyzed...

... We present results from large-scale towing-tank tests conducted to explore the use of jets to suppress the vortex shedding from a circular cylinder immersed in a uniform turbulent stream. The jets were produced by injecting water through a number of discrete holes arranged along the cylinder's...

.... The drag and lift characteristics, the vorticity, streamline distribution and the vortex shedding frequency are investigated. Numerical results are compared with those of the Finite Volume method (FVM) software calculations and indicate good agreements. INTRODUCTION Flow past a bluff body...

... full beam element software that includes the axial stiffness. For the response under vortex shedding or VIV, industry software uses modal based methods, e.g. Shear7, these do not include any axial properties in the calculation, thus the potential for any axial stress and motion is missing. This paper...

... would end up in different situations for various initial excitation. The cylinder presents large vibration amplitudes at high reduced velocities companying with vortex shedding frequencies locked to multiple harmonics of natural frequencies. INTRODUCTION Vortex-induced vibrations (VIV...