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Ridge-type roughness: from turbulent channel flow to internal combustion engine

Deyn, Lars H. von ORCID iD icon; Schmidt, Marius; Örlü, Ramis; Stroh, Alexander; Kriegseis, Jochen ORCID iD icon; Böhm, Benjamin; Frohnapfel, Bettina ORCID iD icon

Abstract:

While existing engineering tools enable us to predict how homogeneous surface roughness alters drag and heat transfer of near-wall turbulent flows to a certain extent, these tools cannot be reliably applied for heterogeneous rough surfaces. Nevertheless, heterogeneous roughness is a key feature of many applications. In the present work we focus on spanwise heterogeneous roughness, which is known to introduce large-scale secondary motions that can strongly alter the near-wall turbulent flow. While these secondary motions are mostly investigated in canonical turbulent shear flows, we show that ridge-type roughness—one of the two widely investigated types of spanwise heterogeneous roughness—also induces secondary motions in the turbulent flow inside a combustion engine. This indicates that large scale secondary motions can also be found in technical flows, which neither represent classical turbulent equilibrium boundary layers nor are in a statistically steady state. In addition, as the first step towards improved drag predictions for heterogeneous rough surfaces, the Reynolds number dependency of the friction factor for ridge-type roughness is presented.


Verlagsausgabe §
DOI: 10.5445/IR/1000141712
Veröffentlicht am 10.01.2022
Originalveröffentlichung
DOI: 10.1007/s00348-021-03353-x
Scopus
Zitationen: 6
Web of Science
Zitationen: 6
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 0723-4864, 1432-1114
KITopen-ID: 1000141712
Erschienen in Experiments in Fluids
Verlag Springer
Band 63
Heft 1
Seiten 18
Nachgewiesen in Dimensions
Scopus
Web of Science
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