Strouhal numbers of rectangular cylinders at incidence: A review and new data

Knisely, Charles W.

doi:10.1016/0889-9746(90)90137-t

Cited by 220 publications

(131 citation statements)

References 25 publications

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“…Figure 10(b) shows an increase of the relative bandwidth of the vortex shedding peak with the yaw angle. These results are in good agreement with those from Knisely [10]. He found the bandwidth B f of the peak of the fluctuating lift spectrum to be constant with the flow speed, resulting in a decrease of the relative bandwidth with increasing flow speed.…”

Section: Square Cylindersupporting

confidence: 82%

“…A decrease of around 15 dB is obtained from the results in terms of C Lrms obtained by Tamura and Miyagi [34]. A similar decrease of the rms fluctuating lift coefficient was obtained by Knisely [10] for angles of However, the results found in the literature show an increase of the SPL and variations of Strouhal number for angles higher than 15 • , indicating that a vortex shedding peak was still detected, while in the present experiments the vortex shedding peak was not triggered for angles higher than 15 • .…”

Section: Dependence On the Angle Of Attack For Square Cylinderssupporting

confidence: 67%

“…Vickery [9] assessed the influence of the angle of attack and incoming turbulence on the Strouhal number, fluctuating lift coefficient and correlation length of square cylinders. Knisely [10] measured the Strouhal numbers of rectangular cylinders with different slenderness ratios in the range from 0.04 to 4.0 for different angles of attack, while Okajima [11] assessed the effect of the Reynolds number on the Strouhal number of rectangular cylinders with slenderness ratios from 1 to 4. The effect of the angle of attack on the Strouhal number and fluctuating lift coefficient for elliptical cylinders with different eccentricities was studied experimentally by Modi and Wiland [12] and Modi et al [13].…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the aerodynamic noise radiated by cylinders with different cross-sections and yaw angles

Iglesias

Thompson

Smith

2016

Journal of Sound and Vibration

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Vortex shedding from cylinders has been extensively studied due to its occurrence in many engineering fields. Many experimental studies reported in the literature focus on the aerodynamics of the vortex shedding process but the literature about the radiated noise is more scarce. The aim of the work presented here is to extend the available noise data. Aero-acoustic wind tunnel tests were carried out using cylinders with different cross-sections: circular, square, rectangular and elliptical. Flow speeds between 20 and 50 m/s were used, corresponding to Reynolds numbers in the range from 1.6 × 10 4 to 1.2 × 10 5 . The dependence of the noise on the yaw angle, flow speed, cross-sectional shape, angle of attack and radiation angle (directivity) is assessed. The results obtained are compared, where possible, with those found in the literature for similar cases. It is intended that the results can be used for the validation and calibration of numerical and empirical aerodynamic noise prediction models.

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Section: Square Cylindersupporting

confidence: 82%

Section: Dependence On the Angle Of Attack For Square Cylinderssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

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Experimental study of the aerodynamic noise radiated by cylinders with different cross-sections and yaw angles

Iglesias

Thompson

Smith

2016

Journal of Sound and Vibration

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“…This influence was studied for example, by Nakamura, Ohya & Tsuruta (1991) (Re = 1000), Knisely (1990) (720 Re 31 000) and Parker & Welsh (1983) (17 000 Re 35 000).…”

Section: Introductionmentioning

confidence: 99%

Fluid–structure interaction-induced oscillation of flexible structures in laminar and turbulent flows

Gomes

Lienhart

2013

J. Fluid Mech.

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Self-excitation of the motion of a structure has become a prominent aspect of engineering projects over recent years as designers are using materials at their limits, causing structures to become progressively lighter, more flexible and, therefore, prone to vibrate. Stimulated by the increasing interest in fluid-structure interaction (FSI) problems, this study investigated the instability and consequent FSI-induced self-excited oscillation of flexible structures in uniform flows at Reynolds numbers between 10 and 1.69 × 10 5 . The investigations were performed in both water and a highly viscous syrup (ν = 1.64 × 10 −4 m 2 s −1 ) and considered three structures of different geometries. The results were conclusive in showing that the motion of the structure was characterized by a sequence of oscillation modes as a function of the characteristics of the structure and flow properties. In addition, it was possible to identify the self-excitation mechanisms as being of the instability-induced excitation (IIE) or movement-induced excitation (MIE) types. IIE was observed to be the most dominant mechanism of excitation at lower velocities and it was defined by a direct relation between the flow fluctuation and natural frequencies of the structure. For that reason, IIE was strongly determined by the geometry of the front body of the structure. At higher velocities, the amplitudes of the flow disturbances generated by the structure movement increased and excitations of the MIE type became predominant for all structures. The MIE mechanism was found to be weakly influenced by the shape of the structure but very sensitive to its dynamic characteristics and to the properties of the fluid, especially the Reynolds number.

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“…Traditional Strouhal numbers determined for stationary rectangular cylinders (Knisely, 1990) do not predict the critical reduced velocity were vibrations first occur for elastically supported rectangular cylinders. Furthermore, the modified Strouhal numbers established for stationary rectangular cylinders and based on the length of the cylinder (Nakamura et al, 1991) do not predict the critical reduced velocity where vibrations first occur.…”

Section: Aspect Ratiosmentioning

confidence: 97%

Flow-induced vibration of elastically supported rectangular cylinders

Garrett

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Strouhal numbers of rectangular cylinders at incidence: A review and new data

Cited by 220 publications

References 25 publications

Experimental study of the aerodynamic noise radiated by cylinders with different cross-sections and yaw angles

Experimental study of the aerodynamic noise radiated by cylinders with different cross-sections and yaw angles

Fluid–structure interaction-induced oscillation of flexible structures in laminar and turbulent flows

Flow-induced vibration of elastically supported rectangular cylinders

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