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Van Hinsberg, Nils Paul (2016) EXPERIMENTAL INVESTIGATION OF THE REYNOLDS-NUMBER EFFECT ON THE STEADY AND UNSTEADY LOADING ON A SLIGHTLY ROUGH CIRCULAR CYLINDER AT REYNOLDS NUMBERS UP TO 12 MILLION. In: OMAE2016: Proceedings of the ASME 35th International Conference on Ocean, Offshore and Arctic Engineering, Vol 1. OMAE 2016, 19.-24. Juni 2016, Busan, Süd Korea.
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Abstract
This paper presents the Reynolds-number dependent unsteady aerodynamic force and time-averaged local surface pressure distributions acting on a 2D slightly rough circular cylinder up to high transcritical Reynolds numbers. The research was carried out in the High-Pressure Wind Tunnel (DNW-HDG) over a wide range of Reynolds numbers between 15x10^3 < Re < 12x10^6. The cylinder had a relative surface roughness of ks/D = 1.2x10^-3. The results demonstrated that especially in the critical regime the spanwise flow was strongly three-dimensional. Here, two discontinuities at two closely-spaced Reynolds numbers were observed, coupled with critical fluctuations in the lift force and the time-lagged formation of a separation bubble at each side of the cylinder. The presence of a slight surface roughness led to the disappearance of the supercritical regime, a subsequent strong recovery of the drag coefficient in the upper transition and intermediate steady plateaus for all aerodynamic properties in the transcritical state.
| Item URL in elib: | https://elib.dlr.de/104964/ | ||||||
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| Document Type: | Conference or Workshop Item (Speech) | ||||||
| Title: | EXPERIMENTAL INVESTIGATION OF THE REYNOLDS-NUMBER EFFECT ON THE STEADY AND UNSTEADY LOADING ON A SLIGHTLY ROUGH CIRCULAR CYLINDER AT REYNOLDS NUMBERS UP TO 12 MILLION | ||||||
| Authors: |
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| Date: | June 2016 | ||||||
| Journal or Publication Title: | OMAE2016: Proceedings of the ASME 35th International Conference on Ocean, Offshore and Arctic Engineering, Vol 1 | ||||||
| Refereed publication: | Yes | ||||||
| Open Access: | No | ||||||
| Gold Open Access: | No | ||||||
| In SCOPUS: | No | ||||||
| In ISI Web of Science: | No | ||||||
| Status: | Published | ||||||
| Keywords: | Reynolds number, flow separation, critical flow, circular cylinder, surface roughness, bluff body | ||||||
| Event Title: | OMAE 2016 | ||||||
| Event Location: | Busan, Süd Korea | ||||||
| Event Type: | international Conference | ||||||
| Event Dates: | 19.-24. Juni 2016 | ||||||
| Organizer: | ASME | ||||||
| HGF - Research field: | Aeronautics, Space and Transport | ||||||
| HGF - Program: | Aeronautics | ||||||
| HGF - Program Themes: | fixed-wing aircraft | ||||||
| DLR - Research area: | Aeronautics | ||||||
| DLR - Program: | L AR - Aircraft Research | ||||||
| DLR - Research theme (Project): | L - Flight Physics (old) | ||||||
| Location: | Göttingen | ||||||
| Institutes and Institutions: | Institute of Aeroelasticity > Aeroelastic Experiments | ||||||
| Deposited By: | van Hinsberg, Dr. Ir. Nils | ||||||
| Deposited On: | 06 Jul 2016 10:53 | ||||||
| Last Modified: | 19 Jan 2017 09:38 |
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