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High Reynolds-number flows over two equal in-line rounded square-section prisms at incidence

van Hinsberg, Nils (2025) High Reynolds-number flows over two equal in-line rounded square-section prisms at incidence. Flow Turbulence and Combustion, 115 (2), 705 - 738. Springer. doi: 10.1007/s10494-025-00674-3. ISSN 1386-6184.

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Offizielle URL: https://doi.org/10.1007/s10494-025-00674-3

Kurzfassung

This paper investigates the time-averaged and fluctuating aerodynamics of two slightly rough square-section prisms with rounded lateral edges of r/D=0.16, positioned in-line at a centre-to-centre distance S/D=4.0. For that purpose, distributions of the time-dependent surface pressures along both prisms’ mid-span cross-sections, the derived mean sectional pressure drag, lift, and pitch moment coefficients, as well as spanwise-integrated fluctuating fluid loads on the downstream prism and the frequency of the eddy shedding in its wake were measured simultaneously for Reynolds numbers between 100,000 and 7 million. Evaluation of the data and comparison with the results of an identical single prism revealed substantial changes of the flow over both prisms with increasing Reynolds number for all studied incidence angles between 0deg and 45deg in the form of mutual aerodynamic influences due to proximity and wake-interference effects. For most studied flow parameters, a good agreement of the trends of the mean aerodynamic coefficients with incidence angle between the upstream and reference prism are obtained. Proximity effects are nevertheless clearly visible in the surface pressures, in particular at alpha1 > 25.5deg. Contrarily, wake-interference effects lead to a much lower and even negative drag on the downstream prism and opposite trends for lift and pitch moment compared to the upstream prism. The impingement of either one or both shear layer(s) coming from the upstream prism or of the eddies formed in the gap between both prisms not only influences the time-dependent surface pressures on the downstream prism, but also triggers and synchronises the eddy shedding between both prisms.

elib-URL des Eintrags:https://elib.dlr.de/216174/
Dokumentart:Zeitschriftenbeitrag
Titel:High Reynolds-number flows over two equal in-line rounded square-section prisms at incidence
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
van Hinsberg, Nilsnils.vanhinsberg (at) dlr.dehttps://orcid.org/0000-0001-7411-333X192222204
Datum:10 Juli 2025
Erschienen in:Flow Turbulence and Combustion
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:115
DOI:10.1007/s10494-025-00674-3
Seitenbereich:705 - 738
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der HerausgeberHerausgeber-ORCID-iDORCID Put Code
Salvetti, Maria VittoriaNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Kempf, Andreas M.NICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Verlag:Springer
ISSN:1386-6184
Status:veröffentlicht
Stichwörter:Tandem prisms, Incidence angle, Reynolds number, Edge roundness, Wind tunnel, Interference effects
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Effizientes Luftfahrzeug
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L EV - Effizientes Luftfahrzeug
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Flugzeug und Validierung
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren, GO
Hinterlegt von: Micknaus, Ilka
Hinterlegt am:19 Sep 2025 09:39
Letzte Änderung:23 Sep 2025 13:44

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