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Two identical tandem square prisms with rounded edges and hard marine fouling at incidence in cross-flow: effect of spacing and Reynolds number on unsteady fluid dynamics

van Hinsberg, Nils (2022) Two identical tandem square prisms with rounded edges and hard marine fouling at incidence in cross-flow: effect of spacing and Reynolds number on unsteady fluid dynamics. Ocean Engineering, 262, e112302. Elsevier. doi: 10.1016/j.oceaneng.2022.112302. ISSN 0029-8018.

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Offizielle URL: https://www.sciencedirect.com/science/article/pii/S0029801822015992

Kurzfassung

Because of their long submerged columns, deep-draft semi-submersible floating structures are particularly susceptible to vortex-induced motions. This paper focuses on the steady and unsteady forces that act on such a column pair, as well as on the frequency and strength of the shed vortices behind the downstream column. Wind tunnel experiments were performed on two rounded and lightly rough square-section prisms in cross-flow for Reynolds numbers from 100,000 up to 7 million. They are arranged inline at centre-to-centre distances of S/D = 2.8, 4, and 5.6 and at 0° or 45° incidence angle. The trend of the drag curve for the upstream prism deviates at S/D = 2.8 and 4 sharply from that for a single prism. The drag force on the downstream prism strongly depends on both S/D and α. At S/D = 2.8, a thrust force occurs either in certain (α = 0°) or in all (α = 45°) flow states. Larger spacing values lead to an overall higher drag and a flattening of the Cd2 (ReD) curve. The highest fluctuating lift forces on the downstream prism are obtained at α = 45°. Regarding the vortex shedding frequency, differences between both incidence angles occur at S/D = 5.6 only.

elib-URL des Eintrags:https://elib.dlr.de/188127/
Dokumentart:Zeitschriftenbeitrag
Titel:Two identical tandem square prisms with rounded edges and hard marine fouling at incidence in cross-flow: effect of spacing and Reynolds number on unsteady fluid dynamics
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
van Hinsberg, NilsNils.vanHinsberg (at) dlr.dehttps://orcid.org/0000-0001-7411-333X134152088
Datum:15 Oktober 2022
Erschienen in:Ocean Engineering
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:262
DOI:10.1016/j.oceaneng.2022.112302
Seitenbereich:e112302
Verlag:Elsevier
ISSN:0029-8018
Status:veröffentlicht
Stichwörter:Tandem rounded square prism, Marine fouling, High Reynolds number Interference effect, Negative drag, Unsteady force
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Komponenten und Systeme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L CS - Komponenten und Systeme
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugzeugsysteme
Standort: Göttingen
Institute & Einrichtungen:Institut für Aeroelastik > Aeroelastische Experimente
Hinterlegt von: Mai, Holger
Hinterlegt am:14 Okt 2022 14:25
Letzte Änderung:19 Okt 2023 11:34

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