... vibration flow visualization suppression ABSTRACT Flow-induced vibration (FIV) is a common problem in offshore and marine structures, which can lead to fatigue and decrease the structure's lifespan. In this study, we investigate the FIV response of a flexible circular cylinder with an attached...

... 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...

... at near-shore can suppress the impact of tsunami like waves on the shore. INTRODUCTION A tsunami is a water waveform (or series of waves) that occurs in the ocean (in most cases) that sends a surge of water, sometimes reaching heights of over 30 meters on to land. This kinetic energy within the wave...

... conic cylinder fluid struct variation perforation frequency reynolds number lower reynolds number conic shroud cylinder vortex-induced vibration circular cylinder suppression hydrodynamic parameter conic disturbance upstream oil & gas vortex pattern perforated conic shroud...

... Wind Tunnel Experiment on Suppression of Vortex induced Vibration for Circular Cylinder with Fairings at Large Mass-Damping Parameter Jiasong Wang1 Suijuan2 Zhongxu Tian2 Shiquan Jiang3 Liangbin Xu3 Leixiang Sheng3 1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong...

... cylinders are discussed in detail. It is found that placing a certain amount of small rods at appropriate locations can achieve good suppression effectiveness, but the effect is different at different diameter ratios or different gaps. Under a specific shear flow, a reasonable parameter combination...

... suppression vortex-induced vibration natural frequency incoming velocity reduction synchronization frequency riser amplitude geometric disturbance sarpkaya cylinder waviness fluid struct circular cylinder experiment straight cylinder upstream oil & gas disturbance...

... swirling strength ( WD 2/ U 2) is almost constant with Reynolds number ( Re = 1.0×104 ~ 4.0×104). For a pipeline close to the bottom, the peak value of WD 2/ U 2 decreases with the decrease of the gap ratio ( e / D ) when e / D < 0.3, owing to the suppression of vortex shedding. For piggyback...

... ABSTRACT: Experimental investigations are conducted to study the influence of attack angle of multiple control rods on the effectiveness of Vortex- Induced Vibration (VIV) suppression for deepwater riser. The riser model is made of UPVC pipe with length to diameter ratio L / D = 1750...

... displacement synchronization straight cylinder oscillation experimental investigation disturbance vortex-induced vibration frequency riser new device incoming velocity reduction circular cylinder suppression waviness experiment cylinder natural frequency ABSTRACT...

... Reynolds number, significant differences in wake vortex patterns were observed for wavy cylinder with small inclined angle while the difference in wake pattern becomes insignificant for large inclined angle. This implies that significant drag reduction and fluctuating lift suppression would be obtained...

... cylinders with different diameters The second test case is flow past two cylinders with different diameters. In 1990, Strykowski and Sreenivasan investigated the suppression of the vortex shedding from a circular cylinder by introducing a small circular cylinder at low Reynolds numbers. Since...

... but highly effective method of seismic survey at sea, the acquired data cannot be stored digitally for subsequent study, including processing, display and interpretation. upstream oil & gas swell effect streamer suppression high-resolution marine seismic data window length reservoir...

... reduction vortex modi visualization study rotation engineering vortex resonance vibration free-vortex line cylinder vibration suppression reduction boundary-layer control suppression Proceedings of the Fifth (1995) International Offshore and Polar Engineering Conference The Hague...

... operations (Brink and Chung, 1981). A buffer is a large mass at the bottom end of the pipe Vortex shedding introduces control problems as well as restrictions on heading and speed, which can be alleviated by use of vortex-shedding suppression devices (Chung and Whutney, 1980 an. 1981, Whutney and Chung, 1980...

... ishida irregular wave displacement vibration experiment water level variation cancellation point wave force linearized method subsea system offshore platform cosh suppression upstream oil & gas spectral density variation theoretical solution equation frequency resonance...