Analysis of Vortex Shedding Frecuencies, in Curved Buildings
Journal Title: IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) - Year 2018, Vol 15, Issue 6
Abstract
The Curved buildings are a challenge for structural engineers, either because there are no standards for this purpose, such as the need to resort to scale tests in wind tunnels. This work presents a number of wind tunnel tests of a curved building with circular arc profile, which was subjected to different angles of attack of the wind, to obtain the frequency of vortex shedding, in order to determine if the number of Strouhal remains constant or varies with the angle of attack of the wind. The tunnel where the tests were carried out is of atmospheric boundary layer, with a wind profile for a type IV urban environment (according to CIRSOC 102, ASCE 7 standards) and Reynolds numbers between 6x104 and 105 . The speeds were measured in the wake, at the coordinate point Y = 3.5.C, X = 0.4.C.Sen α (C is the chord and α is the angle of attack). With the data we proceeded to do a spectral analysis to calculate the corresponding Strouhal number. The main results obtained indicate that the main frequency of vortex shedding varies strongly according to the angle of incidence, therefore also the Strouhal number does, a result that is different from those obtained by C. Knisely (1990) in cylinders of rectangular base, where for those buildings the number of Strouhal varies only in the first 10 degrees producing a slight increase, and then remains constant.
Authors and Affiliations
Carlos M. Walter, Jorge L. Lässig
Keywords
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