Galloping stability of triangular cross-sectional bodies: A systematic approach

Alonso, G.; Meseguer, José; Pérez-Grande, Isabel

doi:10.1016/j.jweia.2007.01.012

Cited by 71 publications

(37 citation statements)

References 18 publications

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“…However, most of those efforts have been focused on bodies with square or rectangular cross-sections, although prismatic bodies with other also interesting cross-sectional shapes can be unstable to transverse galloping (Blevins, 2001). A general analysis based on Glauert-Den Hartog criterion of two-dimensional triangular crosssectional bodies (the main vertex angle ft ranging from 10° to 90°) can be found in Alonso and Meseguer (2006), and a similar study but based on dynamical tests is reported in Alonso et al (2005Alonso et al ( , 2007, although these last studies are limited to the range 10°<^<60°.…”

Section: )mentioning

confidence: 91%

“…To asses the suitability of the static tests approach to support galloping analyses, both static and dynamic wind tunnel tests were performed (Alonso et al, 2005(Alonso et al, , 2007 showing that the results obtained from the static tests are in very good agreement with the dynamic ones. In the last decades large efforts have been devoted to experimentally study the galloping features of many bodies having different cross-sections.…”

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confidence: 99%

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On the galloping instability of two-dimensional bodies having elliptical cross-sections

Alonso

Meseguer

Sanz-Andrés

et al. 2010

Journal of Wind Engineering and Industrial Aerodynamics

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Keywords:Galloping Elliptical cross-section bodies Wind tunnel Galloping, also known as Den Hartog instability, is the large amplitude, low frequency oscillation of a structure in the direction transverse to the mean wind direction. It normally appears in the case of bodies with small stiffness and structural damping, when they are placed in a flow provided the incident velocity is high enough. Galloping depends on the slope of the lift coefficient versus angle of attack curve, which must be negative. Generally speaking this implies that the body is stalled after boundary layer separation, which, as it is known in non-wedged bodies, is a Reynolds number dependent phenomenon. Wind tunnel experiments have been conducted aiming at establishing the characteristics of the galloping motion of elliptical cross-section bodies when subjected to a uniform flow, the angles of attack ranging from 0° to 90°. The results have been summarized in stability maps, both in the angle of attack versus relative thickness and in the angle of attack versus Reynolds number planes, where galloping instability regions are identified.

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confidence: 91%

Section: )mentioning

confidence: 99%

On the galloping instability of two-dimensional bodies having elliptical cross-sections

Alonso

Meseguer

Sanz-Andrés

et al. 2010

Journal of Wind Engineering and Industrial Aerodynamics

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“…In addition, some studies focused on the heat transfer characteristics of a triangular cylinder placed in a channel with confined flows (De and Dalal 2006;Srikanth et al 2010;Ali et al 2011). Further experimental and numerical results are available for flow past an oscillating triangular cylinder (Alonso and Meseguer 2006;Alonso et al 2007;Srigrarom and Koh 2008;Alonso et al 2012;Alawadhi 2013). Srigrarom and Koh (2008) presented the self-excited rotational oscillation on isolated triangular cylinder.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Flow Past Two Transversely Oscillating Triangular Cylinders in Tandem at Low Reynolds Number

Zhai

Wang

2017

JAFM

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Flow past two tandem triangular cylinders forced to oscillate transversely in a uniform flow, is numerically investigated at a Reynolds number Re = 100. The incompressible Navier-Stokes equations in ArbitraryLagrangian-Eulerian formulation are solved by four-step fractional finite element method. The two cylinders are oscillated in phase and their motions are limited to low amplitudes with a wide frequency range. This study focuses on two typical spacings between the two cylinders, corresponding to vortex suppression (VS) regime and vortex formation (VF) regime respectively for flow past two stationary cylinders. Numerical results show that the response characteristics of two cylinders are significantly affected by the spacing, oscillation amplitude and frequency. For the VS spacing, both cylinders have a wider lock-on region, especially at relatively larger amplitude and higher frequency; the downstream wake patterns are mainly 2S and a combination of 2S* and 2S. However, for the VF spacing, the lock-on frequency range of the cylinders is even slightly narrower than that of a single oscillating cylinder; the wake field is more complex since it may comprises 2S, P+S and 2S* structures at some higher frequencies. Additionally, the hydrodynamic forces are also discussed in terms of mean and root mean square quantities, and reveal large differences between oscillating and stationary cylinders.

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“…The influence of relevant parameters like the incident turbulence (Novak and Tanaka, 1974;Li et al, 1998;Ziller andRuscheweyh, 1997, Hemon et al, 2001;Hemon and Santi, 2002), the geometry of the cross section (Ruecheweyh et al, 1996;Kawai, 1998;Luo et al, 1998;Gjelstrup and Georgakis, 2011), the Reynolds number (Sen and Mittal, 2011;Joly et al, 2012) or the hysteresis phenomenon (Parkinson and Brooks, 1961;Parkinson and Smith,1964;Luo et al, 2003;Ng et al, 2005, Vio et al, 2007Barrero-Gil et al, 2009;Dunnmon et al, 2011) have been treated. Although most of the effort in galloping research has been concentrated in bodies with square or rectangular cross-sections, prismatic bodies with other cross-sectional shapes have been also considered (Blevins, 1990;Naudascher and Rockwell, 1994;Alonso and Meseguer, 2006;Alonso et al, 2005Alonso et al, , 2007Alonso et al, , 2009Alonso et al, , 2010.…”

Section: Introductionmentioning

confidence: 99%

Hysteresis phenomena in transverse galloping of triangular cross-section bodies

Alonso

Lobera

Meseguer

2012

Journal of Fluids and Structures

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Transverse galloping is a type of aeroelastic instability characterised by large amplitude, low frequency oscillation of a structure in the direction normal to the mean wind direction. It normally appears in bodies with small stiffness and structural damping, provided the incident flow velocity is high enough. In the simplest approach transverse galloping can be considered as a one-degree-of-freedom oscillator subjected to aerodynamic forces, which in turn can be described by using a quasi-steady description. In this frame it has been demonstrated that hysteresis phenomena in transverse galloping is related to the existence of inflection points in the curve giving the dependence with the angle of attack of the aerodynamic coefficient normal to the incident flow. Aiming at experimentally checking such a relationship between these inflection points and hysteresis, wind tunnel experiments have been conducted. Experiments have been restricted to isosceles triangular cross-section bodies, whose galloping behaviour is well documented. Experimental results show that, according to theoretical predictions, hysteresis takes place at the angles of attack where there are inflection points in the lift coefficient curve, provided that the body is prone to gallop at these angles of attack.

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Galloping stability of triangular cross-sectional bodies: A systematic approach

Cited by 71 publications

References 18 publications

On the galloping instability of two-dimensional bodies having elliptical cross-sections

On the galloping instability of two-dimensional bodies having elliptical cross-sections

Numerical Study of Flow Past Two Transversely Oscillating Triangular Cylinders in Tandem at Low Reynolds Number

Hysteresis phenomena in transverse galloping of triangular cross-section bodies

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