Measurements of turbulent and periodic flows around a square cross-section cylinder

Durão, D. F. G.; Heitor, M. V.; Pereira, J. C. F.

doi:10.1007/bf00538820

Cited by 204 publications

(113 citation statements)

References 15 publications

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“…The same Strouhal number can be seen for present work and the references [2,3,5] according to table 1. Figure 9 shows the U spectra at locations x * = 2 and 3.5 for two y plane in the wake of a square cylinder at Reynolds number of 8600.…”

Section: Spectral Analysis Of Wake Flowsupporting

confidence: 65%

“…These maximum values are declined as the distance from the model increases. Durao [2] pointed out that the wake of a square cylinder has an anisotropic nature. In addition, a high value of turbulent intensity is explained as a result of vortex shedding.…”

Section: Resultsmentioning

confidence: 99%

“…The previous studies on square cylinders [2,3,9] showed that there was an inversing flow at dimensionless distance of 0.9. According to the present study, the nearest section to the rear side of the model …”

Section: Methodsmentioning

confidence: 91%

“…Durao et al [2] investigated closely the wake of a square cylinder in a uniform flow using a laser Doppler velocimetry (LDV) in a water channel at a Reynolds number of 14000. They separated the random and periodic components of the velocity fluctuations in their investigation.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Near Wake Flow Behind a Rectangular Cylinder

Shadaram¹,

Fard²,

Rostamy³

2008

American J. of Applied Sciences

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Abstract:The turbulence characteristics of the near wake flow behind a rectangular cylinder is investigated in a two-dimensional analysis using a hot-wire anemometer. The time-averaged and fluctuating components of the velocity are measured for a cylinder having various width-to-height (b h −1 ) ratios. The measurements are carried out in a low-speed wind tunnel. Data from hot-wire anemometer is collected by a data acquisition system. The results show that the turbulence intensity in the flow wake decreases as the width-to-height ratio of the cylinder increases. In addition, the characteristics of the flow field in a few sections are evaluated. Spectral analysis of the velocity signals is carried out for two different Reynolds numbers. The spectral analysis shows that Strouhal number remains nearly constant in high Reynolds numbers. The results of present experiments are in close agreement with the most widely accepted results in the literature.

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Section: Spectral Analysis Of Wake Flowsupporting

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Near Wake Flow Behind a Rectangular Cylinder

Shadaram¹,

Fard²,

Rostamy³

2008

American J. of Applied Sciences

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“…The rest of the components of the pantograph head (horn bush and downstream contact strip, straps and brackets) are assumed to be in the wake of the upstream contact strip. Because no measurements were available on the incident mean flow speed U i and turbulence intensity I u for each component of the pantograph head, values of U = 0.85U ∞ and I u = 10% are assumed based on results found in the literature on the flow characteristics downstream of a square cylinder [60,61] for distances equivalent to those here. In the knee region the wire arms and control strut are assumed to be in clean flow.…”

Section: Pantograph Modelmentioning

confidence: 99%

Component-based model to predict aerodynamic noise from high-speed train pantographs

Iglesias

Thompson

Smith

2017

Journal of Sound and Vibration

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At typical speeds of modern high-speed trains the aerodynamic noise produced by the airflow over the pantograph is a significant source of noise. Although numerical models can be used to predict this they are still very computationally intensive. A semi-empirical component-based prediction model is proposed to predict the aerodynamic noise from train pantographs. The pantograph is approximated as an assembly of cylinders with particular cross-sections. An empirical database is used to obtain the coefficients of the model to account for various factors: incident flow speed, diameter, cross-sectional shape, yaw angle, rounded edges, length-to-width ratio, incoming turbulence and directivity. The overall noise from the pantograph is obtained as the incoherent sum of the predicted noise from the different pantograph struts. The model is validated using available wind tunnel noise measurements of two fullsize pantographs. The results show the potential of the semi-empirical model to be used as a rapid tool to predict aerodynamic noise from train pantographs.

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An Algebraic Stress Finite Element Model of Turbulent Flow

Ross

Larock

1997

Int. J. Numer. Meth. Fluids

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This paper describes a finite element numerical model for the simulation of both steady and truly transient turbulent flow in two dimensions. All elements of the model and computational approach were chosen, however, for ease of applicability in the future to fully three‐dimensional flows. The turbulent mean flow is described by the Reynolds‐ averaged Navier–Stokes equations. The well‐known two‐equation K–ε model is the base for the representation of turbulence quantities. From three candidate algebraic stress models, Rodi's model was chosen for implementation after preliminary tests on turbulent channel flow. The scheme was then tested at length on flow past a backward‐facing step and flow past a box. Comparisons were made with the computed and experimental results of other investigators. For the backward‐facing step problem the model appears to equal or improve upon the accuracy of prediction s of earlier finite element codes. The frequency of vortex shedding from the corners of the box in terms of the Strouhal number is predicted well. © 1997 by John Wiley & Sons, Ltd.

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Measurements of turbulent and periodic flows around a square cross-section cylinder

Cited by 204 publications

References 15 publications

Experimental Study of Near Wake Flow Behind a Rectangular Cylinder

Experimental Study of Near Wake Flow Behind a Rectangular Cylinder

Component-based model to predict aerodynamic noise from high-speed train pantographs

An Algebraic Stress Finite Element Model of Turbulent Flow

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