Influence of fluid-structure interaction on vortex induced vibration and lock-in phenomena in long span bridges

2016 ◽  
Vol 10 (4) ◽  
pp. 363-384 ◽  
Author(s):  
Nazim Abdul Nariman
Keyword(s):  
Fluid Structure Interaction ◽  
Fluid Structure ◽  
Vortex Induced Vibration ◽  
Long Span Bridges ◽  
Structure Interaction ◽  
Long Span ◽  
Lock In

scholarly journals A Technique For Lock-In Prediction On A Fluid Structure Interaction Of Naca 0012 Foil With High Re

2020 ◽  
pp. 495-509
Author(s):  
Nu Rhahida Arini ◽  
Stephen R. Turnock ◽  
Mingyi Tan
Keyword(s):  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Total Force ◽  
Transform Method ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Reynolds Number Flow ◽  
History Of ◽  
Lock In ◽  
Naca 0012

A numerical lock-in prediction technique of a NACA 0012 hydrofoil, immersed in a flow having a Re of 3.07x106 is proposed in this paper. The technique observes the foil’s response as part of a fluid-structure interaction analysis. The response is modelled by foil’s vibration which is represented by spring and damper components. The technique identifies and predicts the foil’s lock-in when it vibrates. The prediction is examined using the Phase Averaged Method which employs the Hilbert Transform Method. The aim of this paper is to propose a numerical way to identify a lock-in condition experienced by a NACA 0012 foil in a high Reynolds number flow. The foil’s mechanical properties are selected and its motions are restricted in two modes which are in the pitch and heave directions. The rotational and transverse lock-in modes are identified in the model. The existence of lock-in is verified using pressure distribution plot, the history of trailing edge displacement and fluid regime capture. The history of total force coefficients is also shown to justify the result. The result shows that the technique can predict reliably the lock-in condition on the foil’s interaction. Three main fluid induced vibration frequencies are generated in the interaction. None of them are close to natural frequency of the foil and lock-in is apparently not found in the typical operational condition.

scholarly journals Fluid–Structure Interaction Simulation of Vortex-Induced Vibration of a Flexible Hydrofoil

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Abe H. Lee ◽  
Robert L. Campbell ◽  
Brent A. Craven ◽  
Stephen A. Hambric
Keyword(s):  
Finite Element ◽  
Fluid Structure Interaction ◽  
Computational Cost ◽  
Vortical Flow ◽  
Time Step ◽  
Fluid Structure ◽  
Vortex Induced Vibration ◽  
Structure Interaction ◽  
Eddy Simulation ◽  
Tightly Coupled

Fluid–structure interaction (FSI) is investigated in this study for vortex-induced vibration (VIV) of a flexible, backward skewed hydrofoil. An in-house finite element structural solver finite element analysis nonlinear (FEANL) is tightly coupled with the open-source computational fluid dynamics (CFD) library openfoam to simulate the interaction of a flexible hydrofoil with vortical flow structures shed from a large upstream rigid cylinder. To simulate the turbulent flow at a moderate computational cost, hybrid Reynolds-averaged Navier–Stokes–large eddy simulation (RANS–LES) is used. Simulations are first performed to investigate key modeling aspects that include the influence of CFD mesh resolution and topology (structured versus unstructured mesh), time-step size, and turbulence model (delayed-detached-eddy-simulation and k−ω shear stress transport-scale adaptive simulation). Final FSI simulations are then performed and compared against experimental data acquired from the Penn State-ARL 12 in water tunnel at two flow conditions, 2.5 m/s and 3.0 m/s, corresponding to Reynolds numbers of 153,000 and 184,000 (based on the cylinder diameter), respectively. Comparisons of the hydrofoil tip-deflections, reaction forces, and velocity fields (contours and profiles) show reasonable agreement between the tightly coupled FSI simulations and experiments. The primary motivation of this study is to assess the capability of a tightly coupled FSI approach to model such a problem and to provide modeling guidance for future FSI simulations of rotating propellers in crashback (reverse propeller operation).

scholarly journals The influence of fluid–structure interaction on cloud cavitation about a rigid and a flexible hydrofoil. Part 3

2022 ◽  
Vol 934 ◽  
Author(s):  
Yin Lu Young ◽  
Jasmine C. Chang ◽  
Samuel M. Smith ◽  
James A. Venning ◽  
Bryce W. Pearce ◽  
...  
Keyword(s):  
Shock Wave ◽  
Dynamic Load ◽  
Fluid Structure Interaction ◽  
Cavitation Number ◽  
Cloud Cavitation ◽  
Fluid Structure ◽  
Driven Cavity ◽  
Structure Interaction ◽  
Cavity Shedding ◽  
Lock In

Experimental studies of the influence of fluid–structure interaction on cloud cavitation about a stiff stainless steel (SS) and a flexible composite (CF) hydrofoil have been presented in Parts I (Smith et al., J. Fluid Mech., vol. 896, 2020a, p. A1) and II (Smith et al., J. Fluid Mech., vol. 897, 2020b, p. A28). This work further analyses the data and complements the measurements with reduced-order model predictions to explain the complex response. A two degrees-of-freedom steady-state model is used to explain why the tip bending and twisting deformations are much higher for the CF hydrofoil, while the hydrodynamic load coefficients are very similar. A one degree-of-freedom dynamic model, which considers the spanwise bending deflection only, is used to capture the dynamic response of both hydrofoils. Peaks in the frequency response spectrum are observed at the re-entrant jet-driven and shock-wave-driven cavity shedding frequencies, system bending frequency and heterodyne frequencies caused by the mixing of the two cavity shedding frequencies. The predictions capture the increase of the mean system bending frequency and wider bandwidth of frequency modulation with decreasing cavitation number. The results show that, in general, the amplitude of the deformation fluctuation is higher, but the amplitude of the load fluctuation is lower for the CF hydrofoil compared with the SS hydrofoil. Significant dynamic load amplification is observed at subharmonic lock-in when the shock-wave-driven cavity shedding frequency matches with the nearest subharmonic of the system bending frequency of the CF hydrofoil. Both measurements and predictions show an absence of dynamic load amplification at primary lock-in because of the low intensity of cavity load fluctuations with high cavitation number.

Seismic Response Analysis of Free Long-Span Submarine Flexible Pipelines under Earthquakes

2014 ◽  
Vol 580-583 ◽  
pp. 1704-1707
Author(s):  
Yu Lin Deng ◽  
Yu Bian ◽  
Fan Lei
Keyword(s):  
Seismic Response ◽  
Fluid Structure Interaction ◽  
Time History ◽  
Response Analysis ◽  
Seismic Safety ◽  
Peak Displacement ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Finite Element Software ◽  
Long Span

Submarine pipelines are described as the lifeblood of offshore oil and it is crucial to ensure the seismic safety of the submarine pipelines. Based on the fluid-structure interaction numerical analysis method and by using finite element software ADINA, the analysis models of the free long-span submarine flexible pipelines under earthquakes were established. By employing dynamic time-history method, the influences of fluid-structure interaction on the seismic response of the submarine pipelines were researched. The results showed that the peak normal stress and the peak displacement of submarine pipelines’ mid-span considering the influences of the fluid-structure interaction are greater than those without considering the influences, and the influences of the fluid-structure interaction on the seismic response of the submarine pipelines will increase with the increase of the submarine pipelines‘ diameter.

Force Evolution Model for Vortex-Induced Vibration of an Elastic Cylinder in a Cross Flow

2006 ◽  
Author(s):  
X. Q. Wang ◽  
W.-C. Xie ◽  
R. M. C. So
Keyword(s):  
Steady Flow ◽  
Fluid Structure Interaction ◽  
Cross Flow ◽  
Elastic Cylinder ◽  
Evolution Model ◽  
Evolution Process ◽  
Fluid Structure ◽  
Vortex Induced Vibration ◽  
Structure Interaction ◽  
Proposed Model

Vortex-induced vibration of a single circular cylinder is a fundamental and significant case of flow-induced vibrations in both engineering practice and academic research. A force evolution model is developed for vortex-induced vibration of an elastic cylinder in a cross flow. In this model, the elastic cylinder is represented by the Euler-Bernoulli beam theory, and the vortex-induced force acting on the stationary cylinder is modeled by a bounded-noise process. Fluid-structure interaction is represented by an evolution process based on the concept of quasi-steady flow. A numerical iterative approach is used to simulate the evolution process and obtain time histories of cylinder vibration and vortex-induced force. The model is validated against available measurements. It is shown that the proposed model can reproduce the salient features observed in experiments. Furthermore, quantitative agreement with experimental measurements is obtained in general. However, when the vibration amplitude is very large due to intense fluid-structure interaction, the proposed model prediction is not quite satisfactory. This suggests that the concept of quasi-steady flow is only applicable for relatively weak fluid-structure interaction.

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