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Characteristics of the near wake region behind a cylinder at critical and super-critical Reynolds numbers

DOI: 10.1615/ICHMT.2015.THMT-15.630
pages 331-334

Ivette Rodriguez
Heat and Mass Transfer Technological Center (CTTC) Universitat Politecnica de Catalunya - BarcelonaTech (UPC) Colom 11, 08222 Terrassa, Barcelona, Spain

O. Lehmkuhl
Heat and Mass Transfer Technological Center, Polytechnical University of Catalonia (UPC) Colom11, 08222, Terrassa, Barcelona, Spain; Termo Fluids, S.L., Magi Colet, 8, 08204 Sabadell (Barcelona), Spain

J. Chiva
Heat and Mass Transfer Technological Center, Polytechnical University of Catalonia (UPC) Colom11, 08222, Terrassa, Barcelona, Spain

R. Borrell
Heat and Mass Transfer Technological Center (CTTC), Universitat Politecnica de Catalunya, Colom 11 08222 Terrassa, Spain; TermoFluids S.L, Av. Jacquard 97 08222, Barcelona, Spain

Assensi Oliva
Centre Tecnologic de Transferencia de Calor (CTTC), Universitat Politecnica de Catalunya (UPC), Colom 11, 08222 Terrassa, Barcelona, Spain

Sinopsis

Large-eddy simulations (LES) of the flow past a circular cylinder are used to investigate the characteristics of the near wake region at Reynolds numbers Re = 2.5 × 105 − 8.5 × 105. This range encompasses both the critical and super-critical regimes. Wake characteristic lengths are measured and compared between the different Reynolds numbers. It is shown that the super-critical regime is characterised by a plateau in the drag coefficient at about CD ~ 0.22, and a quasi-stable wake which has a width of dω/D ~ 0.4. Power spectra of the lift fluctuations are computed. Wake vortex shedding is found to occur for both regimes investigated, although a jump in frequencies is observed when the flow enters the super-critical regime. The analysis also shows a steep decrease in the fluctuating lift when entering the super-critical regime. Furthermore, the analysis of the turbulent statistics shows that after the changes occurring at critical Reynolds numbers, the wake enters a regime where its dynamics is quite similar regardless of the Reynolds number.

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