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Title:
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Characteristics of the near wake region behind a cylinder at critical and super-critical Reynolds numbers
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Author:
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Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Chiva Segura, Jorge; Borrell Pol, Ricard; Oliva Llena, Asensio
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics; Universitat Politècnica de Catalunya. TUAREG - Turbulence and Aerodynamics in Mechanical and Aerospace Engineering Research Group; Universitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor |
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Abstract:
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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 dw /D ˜ 0.4. The analysis also shows a steep decrease in the Reynolds stresses when entering the super-critical regime. Furthermore, the overall analysis 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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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
-Reynolds number
-Fluid dynamics--Computer simulation
-Dinàmica de fluids -- Simulació numérica |
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Rights:
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Document type:
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Article - Published version
Conference Object |
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Published by:
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Begell House
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