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Experimental investigation on the flow around single and tandem cylinder configurations at Reynolds numbers from 40.000 up to 12 million

Van Hinsberg, Nils Paul and Schewe, Günter and Jacobs, Markus (2015) Experimental investigation on the flow around single and tandem cylinder configurations at Reynolds numbers from 40.000 up to 12 million. Project Report. DNW-GUK-2015 C01, 110 S.

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Abstract

Steady and unsteady force measurements and surface pressure measurements on cylinders in single and tandem configurations were performed for Reynolds numbers from sub- up to transcritical values. The smooth and rough cylinders, either with a square cross-section and rounded edges or with a circular cross-section, represent typical column shapes for large floating offshore structures. The measurements were conducted in the DNW High Pressure Wind Tunnel in Göttingen, a specialized high Reynolds number facility. The aerodynamic forces on the cylinder were measured using a both sided piezo-electric balance. For the tandem cases, only the forces on the downstream cylinder were measured due to restrictions of the test setup. In addition to the unsteady force measurements the time-mean surface pressures at two locations on the cylinders were obtained. As a supplement, a pressure rake was used to measure the time-mean pressure and thus velocity distribution in the wake of the (downstream) cylinder. Variations of the Reynolds number were possible over almost three orders of magnitude in the range from Re = 4·10^4 up to 12·10^6 by changing the free stream flow velocity and the total pressure. In case of the square cross-section cylinders the dependence of the aerodynamic forces and surface pressures on the Reynolds number were investigated for various angles of incidence � and for two non-dimension surface roughness values of O(10^−6) and O(10^−3). At the maximum angle of incidence the blockage did not exceed 13%. For the tandem configurations the distance between the centers of the cylinders had a value of 4.0 and 5.6 times the diameter for the square cylinders and of 2.8 and 4.0 times the diameter for the circular cylinders. For all configurations drastic changes of the global values as function of the Reynolds number were observed.

Item URL in elib:https://elib.dlr.de/97114/
Document Type:Monograph (Project Report)
Title:Experimental investigation on the flow around single and tandem cylinder configurations at Reynolds numbers from 40.000 up to 12 million
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Van Hinsberg, Nils Paulnils.vanhinsberg (at) dlr.deUNSPECIFIED
Schewe, Günterguenter.schewe (at) dlr.deUNSPECIFIED
Jacobs, MarkusDNWUNSPECIFIED
Date:23 March 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:110
Status:Published
Keywords:Single cylinder; tandem configuration; Reynolds number; HDG
Department:Institut für Aeroelastik; DNW-GUK
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 - Flexible Aircraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
German-Dutch Windtunnels > Business Unit Göttingen und Köln (GUK)
Deposited By: van Hinsberg, Dr. Ir. Nils
Deposited On:05 Aug 2015 13:49
Last Modified:05 Aug 2015 13:49

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