Journal of Wind Engineering and Industrial Aerodynamics 90 (2002) 475–489 Vortex shedding from a circular cylinder in a smooth and wired conﬁguration: comparison between 3D LES simulation and experimental analysis D. Rocchi*, A. Zasso Dipartimento di Meccanica, Politecnico di Milano, Via La Masa 34, 20158 Milano, Italy Abstract Vortex shedding from cylindrical structures with circular section is a widely studied phenomenon since this problem is of interest with respect to many technical applications. By means of experimental tests, many aspects of this very complex topic have been investigated andseveraldeviceshavebeenstudiedinordertoreducetheforcinginducedbyﬂuid-structure interaction.Aparticulardevice,consistingoftwowires,havingadiametersmallerthanthatof the cylinder, helically wrapped around the cylinder itself, will be analysed in this paper. Devices like this, whose main idea is to disorganise or modify the ﬂow ﬁeld near the cylinder surface, are already used in different technical applications such as in civil applications (slender towers, smokestacks) or in maritime applications (pipelines or risers) to take only a few examples. The efﬁcacy of this solution has been investigated, in this paper, both by experimentaltestsandbynumericalsimulations.Experimentaltestshavebeencarriedoutina water channel located at Politecnico di Milano and have produced data for a velocity range that covers Reynolds numbers from 2  10 4 to4  10 4 . Numerical simulations, performed by usingacommercialCFDcode(FLUENT)withalargeeddysimulation(LES)approach,have been feasible only for the lowest values of the Reynolds number, due to the large computational power required for these kinds of applications. Simulations have been performed for a 2D and a 3D conﬁguration and have been compared with experimental results. r 2002 Elsevier Science Ltd. All rights reserved. *Corresponding author. Tel.: +39-02-23-99-8434; fax: +39-01-23-99-8492. E-mail address: daniele.rocchi@mecc.polimi.it (D. Rocchi). 0167-6105/02/$-see front matter r 2002 Elsevier Science Ltd. All rights reserved. PII:S0167-6105(01)00203-3