CFD modelling of the cross-flow through normal triangular tube arrays with one tube undergoing forced vibrations or fluidelastic instability

Pedro, Beatriz de; Parrondo, Jorge; Meskell, Craig; Oro, Jesús Fernández

doi:10.1016/j.jfluidstructs.2016.04.006

Cited by 41 publications

(11 citation statements)

References 31 publications

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“…3. Although the present work is still an ongoing study, results obtained with the experimental methodology developed are promising, future experimental campaigns will be undertaken to extract more information of the empirical test and contrast results with CFD calculations obtained with the previous numerical model [5].…”

Section: Discussionmentioning

confidence: 96%

“…The development of self-excited vibrations in cylinder arrays subject to cross-flow such as in shell-and-tube heat exchangers, usually referred to as fluidelastic instability (FEI) has been described basically by three theoretical frameworks: the "wavy-wall" model [1,2]; the quasi-static model (Connors, 1970) [3]; and the quasi-steady model (Price and Paı¨doussis, 1984) [4]. There are also a number of empirical models and numerical simulations of using Large Eddy Simulation, Reynolds Averaged Navier Stokes (de Pedro et al, 2016) [5]. and vortex methods.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Study on the Propagation of the Pressure Fluctuations Induced in a Tube Array under Forced Vibration

Tufiño

Pedro

Laine

et al. 2018

The 2nd International Research Conference on Sustainable Energy, Engineering, Materials and Environment

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Tube arrays subject to cross flow may exhibit large amplitude self-excited vibrations referred to as Fluidelastic Instability (FEI). Due to its potential for damaging the equipment in an extremely sort operational time, FEI is considered the most destructive mechanism within the flow induced vibration phenomena and has been extensively analysed in the literature in the past, however, the underlying mechanism for FEI onset remains unclear. A number of models, based on very different assumptions about the fluidmechal phenomenon has been developed with the common conclusion that the key factor for stability onset is in the relationship between tube motion and flow perturbation in terms of amplitude and phase. In the present study an experimental approach in a water channel especially designed and developed by the authors for the present investigation is proposed. The empirical set-up, consisting in a tube array in which one tube is forced to vibrate while pressure fluctuations due to is motion are monitored in several points of the array, allows to correlate tube motion and pressure perturbations. The FFT postprocess of those signals allows for the study of the perturbations propagation pattern and indeed in the understanding of the FEI phenomenon. Finally present experimental results will allow for the validation, adjust and improvement of a CFD model previously developed by authors.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Propagation of the Pressure Fluctuations Induced in a Tube Array under Forced Vibration

Tufiño

Pedro

Laine

et al. 2018

The 2nd International Research Conference on Sustainable Energy, Engineering, Materials and Environment

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“…Numerical domain consisted in a normal triangular tube array subject to an air cross flow in which one tube is allowed to vibrate freely, geometry of the tube array is shown in Figure 1. This same geometry was previously tested by the authors and compared to experimental data at several stages (Mahon and Meskell, 2009 and 2013, [3,4], Austermann and Popp (1995) [5] and Sawadogo and Mureithi, 2013 [6]), details of the parameters, sensitivity tests and validation can be found in [2]. Figure 2 shows a detail of the deforming mesh used in this series of simulations.…”

Section: Numerical Domain and Meshmentioning

confidence: 99%

“…Here, a series of simulations using a dynamic-mesh URANS solver for increasing amplitudes crossing the stability threshold are carried out in free motion conditions (de Pedro et al, 2016) [2]. The free response of tube response allows the limit cycle oscillation amplitude to be calculated and hence the amplitu-velocity curves can be obtained.…”

Section: Introductionmentioning

confidence: 99%

A Computational Study on the Damping-Amplitude Dependence and Estimation of the Limit Cycle Oscillations for Normal Triangular Arrays with One Tube Undergoing Fluidelastic Instability

Pedro

Laine

Tufiño

et al. 2018

The 2nd International Research Conference on Sustainable Energy, Engineering, Materials and Environment

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While the estimation of the critical velocity for fluidelastic instability of tube arrays has received considerable attention for decades, the studies intended to analyze the post-stable behavior have been scarce. However, the behavior of the system under instability, is also interesting in order to characterize the amount of energy transferred from fluid to structure. A computational study has been carried out for the case of one tube vibrating in a normal triangular array by means of a CFD model previously developed with Fluent by the authors. This model incorporates the motion of the vibrating tube by means of user defined functions for both forced and free oscillations, so that the tube position can be updated and the mesh rebuilt at every time step. First, predictions of limit-cycle oscillations (zero net damping) were obtained for pitch ratios P/d = 1.25 and 1.375, so that the experimental response curves (amplitude against flow velocity) measured in other experimental studies could be used for contrast purposes. After validation, the CFD model was used to investigate how the net damping of the fluid-structure system depends on the vibration amplitude for a given flow velocity, which shows the non-linear nature of the tube response. Finally, special simulation series were conducted to explore the effects of pitch ratio, Reynolds number and structural damping on the net damping of the system for constant vibration amplitude.

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“…The SVM is suitable for large-amplitude vibrations at sub-critical Reynolds numbers. Forced oscillations and self-excited vibrations have been analysed by Pedro et al [9]. The CFD calculations have numbers of advantages such as a) all interesting data (cylinder velocity and amplitude, flow velocity and pressure etc.)…”

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confidence: 99%

Estimation of cross-flow influence on spring-mounted cylinder in triangular cylinder array

Upnere¹,

Jēkabsons²

2017

Engineering for Rural Development

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Abstract. Ongoing research is motivated by the need to better understand the cross-flow and cylinder mechanical interactions leading to vibration processes in close-packed triangular cylinder array. Computational Fluid Dynamics (CFD) simulations have been done with open source OpenFOAM software. Unsteady Reynolds Averaged Navier-Stokes equations for incompressible flows are solved by the finite volume method. Several two-equation turbulence models have been investigated: standard k-epsilon, RNG k-epsilon, and realisable kepsilon model. Based on the pressure drop comparison between the calculations and the experiment, the RNG kepsilon turbulence model has been chosen. CFD simulated quasi-steady-state flow serves as an initial condition for further transient modelling. A spring-mounted cylinder(s) is installed in an array of surrounding rigid cylinders. The neighbourhood rods' influence on the oscillating rod in the bundle system is studied numerically. Oscillations of the cylinder have been described with mass-spring motion equation. Flexible supports allow vibrating the cylinder in both, the longitudinal and transverse direction under the action of unsteady hydrodynamic forces. Dynamic changes of mesh cells ensure that cylinder motion acts on bypassing flow.Keywords: cross-flow, cylinder array, flow-induced vibrations, OpenFOAM, turbulence. IntroductionDue to their practical applications, flow-induced vibrations in tube array is the subject with a large number of investigations, however, the problem stays incompletely understood because of its high nonlinearity. Vibrations induced by bypassing flow usually are easily detectable and potentially can serve as an indicator of the structure integrity and wear.Arrays of cylinders merged in liquid are widely used in engineering such as several offshore structures, heat exchangers, boilers etc. Heat exchangers are crucial in a number of agricultural fields, for example, in dairy products, food and beverages pasteurisation process, as well as in biofuel distillation. In some specific cases, cross flow induced vibrations can occur in the filtration process when high Reynolds fluid flows through the fibre system.The cross flow of the fluid can couple with the rod array in such a way that the flow energy is transferred to the cylinders and excessive oscillations may develop. In the case of a circular cylinder arrays in water flow, the mechanisms of primary interest are turbulence buffeting and fluidelastic instability (FEI) [1]. Failure occurring at turbulence buffeting may take several years to develop, whereas FEI failure can induce in short-term, in extreme cases in a matter of hours. Vibrations can noticeably shorten a device lifespan due to fatigue or lead to the structure integrity problems.Several simple analytical / semi-empirical FEI models for a single flexible cylinder in a fixed cylinder array are developed, for example, quasi-static by Connors Due to increasing computer power, a useful approach for vibration prediction is Computational Fluid Dynamics (CFD) simu...

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CFD modelling of the cross-flow through normal triangular tube arrays with one tube undergoing forced vibrations or fluidelastic instability

Cited by 41 publications

References 31 publications

An Experimental Study on the Propagation of the Pressure Fluctuations Induced in a Tube Array under Forced Vibration

An Experimental Study on the Propagation of the Pressure Fluctuations Induced in a Tube Array under Forced Vibration

A Computational Study on the Damping-Amplitude Dependence and Estimation of the Limit Cycle Oscillations for Normal Triangular Arrays with One Tube Undergoing Fluidelastic Instability

Estimation of cross-flow influence on spring-mounted cylinder in triangular cylinder array

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