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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

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/
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:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Van Hinsberg, Nils Paulnils.vanhinsberg (at) dlr.deUNSPECIFIED
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
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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