Aerodynamic forces on structures of circular cross-section. Part 1. Model-scale data obtained under two-dimensional conditions in low-turbulence streams

Basu, Roger

doi:10.1016/0167-6105(85)90040-6

Cited by 42 publications

(11 citation statements)

References 24 publications

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“…Recently, Hsu et al (2019) performed an experimental work with 38 fabric samples tested on a circular cylinder in a wind tunnel experiment, and concluded that the roughness of the textile materials could be expressed in terms of the Nikuradse's sand-grain roughness (Nikuradse, 1937). By this finding, the effect of textile roughness on the drag crisis phenomenon could be described by the empirical relations originally proposed for other types of roughness elements (Basu, 1985). As for the drag crisis phenomenon of flow over a circular cylinder, a significant number of works can be found in the literature (Achenbach, 1968;Bearman, 1969;Farell & Blessman, 1983;Roshko, 1993;Schewe, 1983;Wieselsberger, 1922;Zdravkovich, 1997).…”

Section: Introductionmentioning

confidence: 79%

A study of drag reduction with textile roughness on a cyclist model

Hsu

Miau

et al. 2021

The Journal of The Textile Institute

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Efforts were made to examine the effect of textile roughness for the reduction of aerodynamic drag experienced on a cyclist model. First of all, flow visualization experiments were conducted in a water channel with a 1/5 scale cyclist model to identify the flow separation lines on the contoured surface. Subsequently, based on the information learned, the idea of delaying flow separation on the model surface was implemented by means of sport suits. Seven sport suits featuring different textile materials and local roughness patterns were tested on a full-scale cyclist model in wind tunnel experiments, in addition to a reference case without a sport suit. From the C D data deduced, we identified a critical condition in most of the cases studied, featuring a least drag coefficient occurred at a Reynolds number within the flow speed range studied. For the best case found, the drag coefficient is amounted 7.5% less than that of the reference case at the same Reynolds number. Furthermore, the C p and C prms values reduced from the pressure measurements on the cyclist model with the sport suits unveil a trend that the reduction of drag actually infers the retreat of the local flow separation lines toward the rear side of the body accompanied with less severe the flow unsteadiness.

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Section: Introductionmentioning

confidence: 79%

A study of drag reduction with textile roughness on a cyclist model

Hsu

Miau

et al. 2021

The Journal of The Textile Institute

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“…Almost always based on wind tunnel results, available forecasting models of these quantities are referred to very standard situations. Concerning circular cylinders, a large amount of well-established data exist related to the drag coefficient and Strouhal number (Basu, 1985); data become highly scattered when related to the lift coefficient. On the contrary, measures concerning non-circular shapes are scarce as the variability of possible configurations increases.…”

Section: Wind-excited Response and Parametersmentioning

confidence: 99%

Reliability analysis of wind-excited structures

Pagnini

2010

Journal of Wind Engineering and Industrial Aerodynamics

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“…In low-turbulence streams, the flow field undergoes some dramatic changes, and three regimes can be identified: sub-critical for 1500(Re(2;10, super-critical for Re'2;10, and post-critical for Re'10. The nature of the transition from sub-critical to super-critical, and the transition from supercritical to post-critical, has been discussed by Basu (1985). For the range of Re from about 10 to at least 2;10, where the point of transition is close to the point of separation and the major portion of the free shear layer is turbulent, the flow field is nearly independent of Re.…”

Section: Introductionmentioning

confidence: 96%