Vortex shedding and vorticity fluxes in the wake of cylinders within a random array. Issue 11 (1st November 2016)

• Record Type: Journal Article
• Authors: Ricardo, Ana M.; Sanches, Pedro M.; Ferreira, Rui M.L.
• Is Part Of: Journal of turbulence. Volume 17:Issue 11(2016)
• Page Start: 999
• Page End: 1014
• Publication Date: 2016-11-01
• Subjects: Array of cylinders -- wake disappearance -- vortex shedding -- Schiller-Linke regime -- vorticity flux; Turbulence -- Periodicals; Turbulence -- Périodiques; 532.0527
• DOI: 10.1080/14685248.2016.1212166
• Languages: English
• ISSNs: 1468-5248

Abstract

ABSTRACT: This work investigates the impact of the background turbulence generated by randomly placed cylinders on the vortex shedding regime and the mechanisms associated to vorticity fluxes. The goals are achieved by exploring velocity databases acquired with a two-dimensional particle image velocimetry system in two types of turbulent flow experiments: flow around a single infinite cylinder and flow within random array of infinite cylinders. Formation lengths, power spectral density functions and vortex distributions are employed to discuss the vortex shedding regime. The effects of background turbulence and vorticity cancellation, due to opposite sign vorticity, on the vorticity fluxes are discussed. The results show that the background turbulence reduces the formation length and consequently increase the shedding frequency. The stronger decay of longitudinal vorticity flux in denser arrays is not accompanied by an increase of the lateral flux of vorticity. Furthermore, it was concluded that the decay of longitudinal vorticity flux is mainly caused by the vorticity cancellation due to the vorticity of opposite sign of close downstream cylinders.