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The Wall-Jet Region of a Turbulent Jet Impinging on Smooth and Rough Plates

Secchi, Francesco ORCID iD icon 1; Gatti, Davide 1; Frohnapfel, Bettina ORCID iD icon 1
1 Institut für Strömungsmechanik (ISTM), Karlsruher Institut für Technologie (KIT)

Abstract:

The study reports direct numerical simulations of a turbulent jet impinging onto smooth and rough surfaces at Reynolds number Re = 10,000 (based on the jet mean bulk velocity and diameter). Surface roughness is included in the simulations using an immersed boundary method. The deflection of the flow after jet impingement generates a radial wall-jet that develops parallel to the mean plate surface. The wall-jet is structured into an inner and an outer layer that, in the limit of infinite local Reynolds number, resemble a turbulent boundary layer and a free-shear flow. The investigation assesses the self-similar character of the mean radial velocity and Reynolds stresses profiles scaled by inner and outer layer units for varying size of the roughness topography. Namely the usual viscous units $u_{\tau}$ and $\delta_{\upsilon}$ are used as inner layer scales, while the maximum radial velocity $u_{m}$ and its wall-normal location $z_{m}$ are used as outer layer scales. It is shown that the self-similarity of the mean radial velocity profiles scaled by outer layer units is marginally affected by the span of roughness topographies investigated, as outer layer velocity and length reference scales do not show a significantly modified behavior when surface roughness is considered. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000153601
Veröffentlicht am 04.01.2023
Originalveröffentlichung
DOI: 10.1007/s10494-022-00387-x
Scopus
Zitationen: 4
Web of Science
Zitationen: 3
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 1386-6184, 0003-6994, 1573-1987, 2212-0939
KITopen-ID: 1000153601
Erschienen in Flow, Turbulence and Combustion
Verlag Springer-Verlag
Band 110
Heft 2
Seiten 275–299
Vorab online veröffentlicht am 23.11.2022
Nachgewiesen in Web of Science
Dimensions
Scopus
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