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Turbulent impinging jets on rough surfaces

Secchi, Francesco ORCID iD icon 1; Häber, Thomas ORCID iD icon 2; Gatti, Davide 1; Schulz, Sebastian 2,3; Trimis, Dimosthenis 3; Suntz, Rainer 2; Frohnapfel, Bettina ORCID iD icon 1
1 Institut für Strömungsmechanik (ISTM), Karlsruher Institut für Technologie (KIT)
2 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)
3 Engler-Bunte-Institut (EBI), Karlsruher Institut für Technologie (KIT)


This work presents direct numerical simulations (DNS) of a circular turbulent jet impinging on rough plates. The roughness is once resolved through an immersed boundary method (IBM) and once modeled through a parametric forcing approach (PFA) which accounts for surface roughness effects by applying a forcing term into the Navier–Stokes equations within a thin layer in the near-wall region. The DNS with the IBM setup is validated using optical flow field measurements over a smooth and a rough plate with similar statistical surface properties. In the study, IBM-resolved cases are used to show that the PFA is capable of reproducing mean flow features well at large wall-normal distances, while less accurate predictions are observed in the near-wall region. The demarcation between these two regions is approximately identified with the mean wall height 𝑘𝑚 of the surface roughness distribution. Based on the observed differences in the results between IBM- and PFA-resolved cases, plausible future improvements of the PFA are suggested.

Verlagsausgabe §
DOI: 10.5445/IR/1000143105
Veröffentlicht am 16.02.2022
DOI: 10.1002/gamm.202200005
Zitationen: 4
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Strömungsmechanik (ISTM)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 0936-7195, 1522-2608
KITopen-ID: 1000143105
Erschienen in GAMM Mitteilungen
Verlag Wiley-VCH Verlag
Band 45
Heft 1
Seiten e202200005
Vorab online veröffentlicht am 02.02.2022
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