In this study, three-dimensional finite element models of high-mast light poles without and with spiral helical strakes were built using ANSYS software to investigate their vibration characteristics in a wind environment. Based on two-way, fluid–structure interaction simulation method, the dynamic responses under different windspeeds analyzed. The results indicate that pole structure may suffer...

this paper carries out the experimental research and analysis on the vortex-excited vibration suppression effect of the spiral stripe strake via the laser particle velocimeter (PIV) under vortex speed U=0.6 m/s and attack angle α=300 and discusses the VIV suppression mechanism of the spiral stripe strake by using the numerical simulation of the computational fluid dynamics (CFD) in order to obj...

In many industrial equipment such as boilers and heat exchangers, the cylindrical tubes are exposed to the gas- liquid two phase flow. For any immersed body in flow field vortex shedding is created with a frequency that may be constant or variable, according to conditions such as flow rates, geometry of body, and etc. The failure will happen in the equipment, when this frequency is close to...

This paper addresses the vibration of a square section cylinder due to the alternate vortex shedding at moderate Reynolds number (3500). The numerical investigation is focused on the perturbation of the vortex shedding in order to decrease the amplitude of the vibrations at lock-in. By analyzing the unsteady flow results, we show that a control technique spatially localized at the surface of th...

With the development of low power electronics and energy harvesting technology, selfpowered systems have become a research hotspot over the last decade. The main advantage of self-powered systems is that they require minimum maintenance which makes them to be deployed in large scale or previously inaccessible locations. Therefore, the target of energy harvesting is to power autonomous ‘fit and ...

In this review, we primarily address the present state of arts and latest progresses in a few frontier issues mostly relevant to free surface/interface ocean engineering. They include TC (tropical cyclone) induced extreme surface wave, sloshing LNG (liquefied natural gas), cavitation/bubble dynamics VIM (vortex-induced motion) VIV vibration). addition general description, mainly focus on recent...

We present a method to calculate the sensitivity of two least stable eigenvalues with respect an external forcing added in fluid-structure interaction system (FSIS). Sensitivity computations are performed by setting proportional flow velocity applied local point domain. find that fields FSIS can be very different from its fixed structure counterpart. For elastic vary according reduced velocity....

As excess water is discharged from a high dam, low frequency noise (air pulsation lower than 10 Hz, LFN) is generated and propagated in the surrounding areas, causing environmental hazards such as the vibration of windows and doors and the discomfort of local residents. To study the generation mechanisms and key influencing factors of LFN induced by flood discharge and energy dissipation from a...

because the underlying physiology of pathological tremor in a parkinson's patient is not well understood, the existing physical and drug therapies have not been successful in tremor treatment. different mathematical modeling of such vibration has been introduced to investigate the problem and reduce the existing vibration. most of the models have represented the induced vibration as a sinusoida...

Abstract This paper investigates the effect of fitting fins at corners a square cylinder on aerodynamic characteristics via wind tunnel tests and large eddy simulations (LES). Although it has been recognized that corner have remarkable cylinder, no study carried out to systematically evaluate this reveal underlying mechanism. Three types fin configurations, i.e. fitted only leading corners, tra...