Vortex-induced vibrations of cylinders bent by the flow

Leclercq, Tristan; Langre, Emmanuel de

doi:10.1016/j.jfluidstructs.2018.03.008

Cited by 32 publications

(12 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Plant model Stability analysis Coupling Alben et al (2002) solved elastic strip no Ghisalberti & Nepf (2004) solved rigid cylinder no Poggi et al (2004) solved rigid cylinder no Dupont et al (2010) solved mechanical oscillator yes yes Luhar & Nepf (2011) imposed elastic strip no Luminari et al (2016) solved rigid cylinder yes no Singh et al (2016) solved rigid cylinder yes no Zampogna et al (2016) solved rigid cylinders yes no solved rigid porous medium yes no Sharma et al (2017) solved dynamic cluster yes yes solved rigid porous medium yes no Leclercq & de Langre (2018) imposed elastic beam yes no This work solved elastic beam yes yes such, the efficiency of aquatic vegetation in protecting coastal regions and the physical mechanisms involved are yet to be fully understood mathematically (Marion et al 2014). Flows through aquatic vegetation are an interesting class of flows to study due to the geometric and mechanical properties of aquatic vegetation.…”

Section: Flowmentioning

confidence: 99%

“…It has been proven both experimentally and numerically that this drag law is accurate until the beam approaches a configuration parallel to the flow (Ramberg 1983;Vakil & Green 2009;Zhao et al 2009). Analogous expressions for drag have been used by Luhar & Nepf (2016) for steady-state flow and by Leclercq & de Langre (2018) for unsteady flow. In the case of rigid and vertical beams (θ ≡ 0), (2.4) reduces to the formulation used in Singh et al (2016).…”

Section: Equations For the Fluidmentioning

confidence: 99%

See 1 more Smart Citation

Shear-induced instabilities of flows through submerged vegetation

2020

View full text Add to dashboard Cite

We consider the instabilities of flows through a submerged canopy, and show how the full governing equations of the fluid-structure interactions can be reduced to a compact framework that captures many key features of vegetative flow. By modelling the canopy as a collection of homogeneous elastic beams, we predict the steady configuration of the plants in response to a unidirectional flow. This treatment couples the beam equations in the canopy to the fluid momentum equations. Our linear stability analysis suggests new insights into the development of instabilities at the surface of the vegetative region. In particular, we show that shear at the top of the canopy is a dominant factor in determining the onset of instabilities known as monami. Based on numerical and asymptotic analysis of the generalised eigenvalue problem, the system is shown to be stable if the canopy is sufficiently sparse or if the plants are sufficiently flexible.

show abstract

Section: Flowmentioning

confidence: 99%

Section: Equations For the Fluidmentioning

confidence: 99%

Shear-induced instabilities of flows through submerged vegetation

2020

View full text Add to dashboard Cite

show abstract

“…When water flow crosses the slot, such as that which exists in the hydraulic plane gate, the vortices in the slot will interact with the separated flow near the downstream corner of the slot due to local boundary mutation in the slot area, which can easily lead to flow cavitation and even endanger the safe operation of hydraulic projects [14]. The vortex-induced vibration of a blunt body or other solid boundary caused by vortex shedding has been studied most [15][16][17][18], while studies of the gate vibration induced by the vortex in the gate slot has been reported rarely.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Comparative Study on the Flow-Induced Vibration of a Plane Gate

Shen

Wang

et al. 2018

Water

View full text Add to dashboard Cite

A numerical method is applied here to simulate the unstable flow and the vibration of a plane gate. A combination of the large eddy simulation (LES) method and the volume of fluid (VOF) model is used to predict the three-dimensional flow field in the vicinity of a plane gate with submerged discharge. The water surface profile, the streamline diagrams, the distribution of turbulent kinetic energy, the power spectrum density curve of the fluctuating pressure coefficient at typical points underneath the gate, and the complete vortex distribution around the gate are obtained by LES-VOF numerical calculation. The vibration parameters of the gate are calculated by the fluid-structure coupling interface transferring the hydrodynamic load. A simultaneous sampling experiment is performed to verify the validity of the algorithm. The calculated results are then compared with experimental data. The difference between the two is acceptable and the conclusions are consistent. In addition, the influence of the vortex in the slot on the flow field and the vibration of the gate are investigated. It is feasible to replace the experiment with the fluid-structure coupling computational method, which is useful for studying the flow-induced vibration mechanism of plane gates.

show abstract

“…Based on wake oscillator models, some studies have analyzed the coupled in-line and cross-flow VIV response of long slender flexible cylinders in uniform flows [14][15][16], and some scholars have also focused their attention on the study of coupled in-line and cross-flow VIV response of long slender flexible cylinders in sheared flows [17][18][19][20][21][22][23]. Leclercq and de Langre [24] also studied the VIV response of cylinders with large in-line bending deformation.…”

Section: Introductionmentioning

confidence: 99%

Study on Vortex-Induced Vibration of Deep-Water Marine Drilling Risers in Linearly Sheared Flows in consideration of Changing Added Mass

Gao

Cong

Cui

et al. 2020

Mathematical Problems in Engineering

View full text Add to dashboard Cite

In order to more accurately predict the coupled in-line and cross-flow vortex-induced vibration (VIV) response of deep-water marine drilling risers in linearly sheared flows, an improved three-dimensional time-domain coupled model based on van der Pol wake oscillator models was established in this paper. The impact of the in-line and cross-flow changing added mass coefficients was taken into account in the model. The finite element, Newmark-β, and Newton–Raphson methods were adopted to solve the coupled nonlinear partial differential equations. The entire numerical solution process was realized by a self-developed program based on MATLAB. Comparisons between the numerical calculations and the published experimental tests showed that the improved model can more accurately predict some main features of the coupled in-line and cross-flow VIV of long slender flexible risers in linearly sheared flows to some extent. The coupled in-line and cross-flow VIV of a real-size marine drilling riser, usually used in the deep-water oil/gas industry in the South China Sea, was analyzed. The influence of top tension force and seawater flow speed, as well as platform heave amplitude and frequency, on the riser in-line and cross-flow VIV was also discussed. The results show that the platform heave motion increases the VIV displacements and changes the magnitudes of peak frequencies as well as the components of frequencies. The platform heave motion also has a significant influence on the vibration modes of the middle and upper sections of the riser. The impact level of each factor on the in-line and cross-flow VIV response of the riser is different. The improved model and the results of this paper can be used as a reference for the engineering design of deep-water marine drilling risers.

show abstract

Vortex-induced vibrations of cylinders bent by the flow

Cited by 32 publications

References 68 publications

Shear-induced instabilities of flows through submerged vegetation

Shear-induced instabilities of flows through submerged vegetation

Numerical and Experimental Comparative Study on the Flow-Induced Vibration of a Plane Gate

Study on Vortex-Induced Vibration of Deep-Water Marine Drilling Risers in Linearly Sheared Flows in consideration of Changing Added Mass

Contact Info

Product

Resources

About