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Determination of strouhal numbers at High Reynolds numbers

Journal of Civil Engineering and Architecture 2014年第2期8卷 169-175页

作者： Jorge Lassig Claudia Palese Faculty of Engineering Universidad Nacional del Comahue Neuquén 8300 Argentina

Leeward of natural elevations, like mountains and hills, the air flow becomes turbulent and often times damaging and hazardous to aviation and downwind populations. There is currently a trend for massive construction projects, the result of which are megastructures that behave similarly to these natural elevations and create analogous turbulence conditions. Examples five mega projects were analyzed, and it was estimated that the Reynolds number variation in these buildings, is from 6.10g and 7.109, for winds between 10 m/s and 50 m/s. In this work, the authors present a first numerical approach to this phenomenon by calculating the strouhal numbers induced by winds blowing against large-volume bodies, in the range of high Reynolds numbers. For this study, satellite images depicting von K^irm^n cloud streets leeward of isolated islands were used. The methodology employed was based on a satellite image where streets watch von K^rnfin vortex, from NOAA-ARL （National Oceanic and Atmospheric Administration-Air Resource Laboratory） prognosis was obtained for a grid point near the island, then determined the inversion layer and meteorological data （wind, temperature and pressure）, was measured from the satellite image the distances separating the vortices to calculate the period, the Reynolds number and strouhal. The studied results of the cases are displayed graphically, where it is possible to observe a data dispersion as well as a rising trend of the strouhal number as the Reynolds number increases.

关键词： Wind vortex strouhal numbers high Reynolds numbers building

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Unsteady Numerical Simulation of Flow around 2-D Circular Cylinder for High Reynolds numbers

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Journal of Marine Science and Application 2013年第2期12卷 180-184页

作者： Yanhui Ai Dakui Feng Hengkui Ye Lin Li School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan 430074 China 710 Institute of China Ship Heavy Industry Group Corporation Yichang 443004 China

In this paper, 2-D computational analyses were conducted for unsteady high Reynolds number flows around a smooth circular cylinder in the supercritical and upper-transition flow regimes, i.e. 8.21×104〈Re〈1.54×106. The calculations were performed by means of solving the 2-D Unsteady Reynolds-Averaged Navier-Stokes （URANS） equations with a k-ε turbulence model. The calculated results, produced flow structure drag and lift coefficients, as well as strouhal numbers. The findings were in good agreement with previous published data, which also supplied us with a good understanding of the flow across cylinders of different high Reynolds numbers. Meanwhile, an effective measure was presented to control the lift force on a cylinder, which points the way to decrease the vortex induced vibration of marine structure in future.

关键词： circular cylinder vortex shedding high Reynolds number strouhal numbers lift control measure marine structure unsteady numerical simulation

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