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Experimental investigation on the combined effects of surface roughness and corner radius for square cylinders at high Reynolds numbers up to 10^7

van Hinsberg, Nils and Schewe, Günter and Jacobs, Markus (2018) Experimental investigation on the combined effects of surface roughness and corner radius for square cylinders at high Reynolds numbers up to 10^7. Journal of Wind Engineering and Industrial Aerodynamics (173), pp. 14-27. Elsevier. DOI: 10.1016/j.jweia.2017.12.003 ISSN 0167-6105

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/S0167610517305354

Abstract

In this study, the aerodynamics of 2D, slightly rough, square-section cylinders with rounded corners is experimentally investigated for Reynolds numbers up to about 12 × 10^6. The cylinders have a mean relative surface roughness of k/D = 1 × 10^−3, a corner radius of either r/D = 0.16 or 0.29 and are positioned at an angle of incidence of 0° or −45° in cross-flow direction. The results show that a larger corner radius induces lower drag coefficients and higher vortex shedding frequencies for all flow regimes, but at lower shedding intensities. Changing the angle of incidence from 0° to −45° results in all coefficients and the wake profile to become nearly independent of the Reynolds number. The critical flow state furthermore shifts to higher Reynolds numbers and decreases in length, whereas the supercritical flow state reduces to a single point. An increase of the surface roughness height from k/D = 5 × 10^−6 to k/D = 1 × 10^−3 induces a shift of the flow regimes towards significantly lower Reynolds numbers. The values of the coefficients show a lower dependency on the Reynolds number in all flow regimes, whereas in the upper transition a strong recovery of all coefficients towards subcritical values takes place.

Item URL in elib:https://elib.dlr.de/117901/
Document Type:Article
Title:Experimental investigation on the combined effects of surface roughness and corner radius for square cylinders at high Reynolds numbers up to 10^7
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
van Hinsberg, NilsNils.vanHinsberg (at) dlr.deUNSPECIFIED
Schewe, Günterguenter.schewe (at) dlr.deUNSPECIFIED
Jacobs, Markusmarkus.jacobs (at) dnw.aeroUNSPECIFIED
Date:January 2018
Journal or Publication Title:Journal of Wind Engineering and Industrial Aerodynamics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.jweia.2017.12.003
Page Range:pp. 14-27
Publisher:Elsevier
ISSN:0167-6105
Status:Published
Keywords:High Reynolds number; Flow separation; Rounded corners; Square section cylinder; Bluff body; Surface roughness; Wind tunnel
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:10 Jan 2018 14:40
Last Modified:06 Sep 2019 15:28

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