The presence of low-frequency fluctuations in the wake of bluff bodies have been observed in several investigations. Even though the flow past a circular cylinder at Re = 3900 (Re = UrefD/ν) has been the object of several experimental and numerical investigations, there is a large scattering in the average statistics in the near wake. In the present work, the flow dynamics of the near wake region behind a circular cylinder has been investigated by means of direct numerical simulations and statistics have been computed for more than 858 shedding cycles. The analysis of instantaneous velocity signals of several probes located in the vortex formation region, point out the existence of a low-frequency fluctuation at the non-dimensional frequency of fm = 0.0064. This large-scale almost periodic motion seems to be related with the modulation of the recirculation bubble which causes its shrinking and enlargement over the time. Two different configurations have been identified: (i) a high-energy mode with larger fluctuations in the shear-layer and in the vortex formation region (Mode H) and (ii) a low-energy mode with weaker fluctuations in the shear layer (Mode L). The influence of such a low-frequency in the wake topology has been studied not only by means of the phase-average flow field for each mode, but also by the analysis of the time-average first- and second-order statistics of each wake mode. The results are compared with the long-term averaged solution and with results in the existing literature.
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August 2013
Research Article|
August 23 2013
Low-frequency unsteadiness in the vortex formation region of a circular cylinder
O. Lehmkuhl;
O. Lehmkuhl
a)
1Heat and Mass Transfer Technological Centre (CTTC),
Universitat Politècnica de Catalunya - BarcelonaTech (UPC)
, ETSEIAT Colom 11, 08222 Terrassa (Barcelona), Spain
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I. Rodríguez;
I. Rodríguez
1Heat and Mass Transfer Technological Centre (CTTC),
Universitat Politècnica de Catalunya - BarcelonaTech (UPC)
, ETSEIAT Colom 11, 08222 Terrassa (Barcelona), Spain
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R. Borrell;
R. Borrell
2Termo Fluids S.L.,
Avda. Jacquard
, 97 1-E, 08222 Terrassa (Barcelona), Spain
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A. Oliva
A. Oliva
1Heat and Mass Transfer Technological Centre (CTTC),
Universitat Politècnica de Catalunya - BarcelonaTech (UPC)
, ETSEIAT Colom 11, 08222 Terrassa (Barcelona), Spain
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a)
Also at Termo Fluids S.L., Avinguda Jacquard, 97 1-E, 08222 Terrassa (Barcelona), Spain. Electronic mail: [email protected].
Physics of Fluids 25, 085109 (2013)
Article history
Received:
February 01 2013
Accepted:
July 31 2013
Citation
O. Lehmkuhl, I. Rodríguez, R. Borrell, A. Oliva; Low-frequency unsteadiness in the vortex formation region of a circular cylinder. Physics of Fluids 1 August 2013; 25 (8): 085109. https://doi.org/10.1063/1.4818641
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