Intermediate wake characteristics behind a circular cylinder

The intermediate wake of a circular cylinder at Reynolds number 3300 is studied by means of highly resolved large eddy simulations. The domain spans 100 cylinder diameters D downstream of the cylinder. The intermediate wake is taken here as the region between 6D and 50D downstream of the cylinder. Initially, the velocity deficit shows a marked decrease. This rate of decrease diminishes in the region 10D to 20D downstream of the cylinder centre. Thereafter, it starts to evolve following the far-wake behaviour. The wake half-width exhibits a marked increase in the region 20D to 40D. It is in this region where the von Kárman vortex street looses its coherence.
J. Fröhlich and J. Ventosa-Molina acknowledge the funding by the Deutsche Forschungsgemeinschaft (DFG), through FR1593/15-1 within PAK948. I. Rodriguez and J. Ventosa-Molina acknowledge funding by AGAUR through grant 2021 SGR 01051. The authors thank Jan Wissink for providing the inflow signals. Part of the computations were performed at the Centre for Information Services and High Performance Computing (ZIH) at TU Dresden. The authors thankfully acknowledges the computer resources at Altamira and MareNostrum Supercomputers and technical support provided by Santander Supercomputacion support group at the University of Cantabria and Barcelona Supercomputing Center - Centro Nacional de Supercomputación (RES-IM-2023-1-0016, RES-IM-2023-2-0021).
Peer Reviewed
Postprint (published version)