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Parametric forcing approach for secondary motions formation over inhomogeneous rough surfaces

Stroh, Alexander; Schäfer, Kay ORCID iD icon; Frohnapfel, Bettina ORCID iD icon; Forooghi, Pourya


A set of direct numerical simulations is used to analyse the application of the so-called parametric forcing approach (PFA), which allows computationally cheaper simulations, instead of high-resolution immersed boundary method (IBM) for modelling of a homogeneous and inhomogeneous rough surface.
It is observed that while the PFA delivers excellent agreement for homogeneous case, the agreement between IBM and PFA is rather limited for the inhomogeneous roughness. While secondary motion topology can be successfully reproduced with the PFA approach, the modification of the mean velocity profile and hence integral flow properties cannot be entirely matched between the two approaches.
It is shown that the application of homogeneous forcing to an inhomogeneous configuration might lead to deviation of the introduced forcing in the regions where topographical transition occurs so the global drag is altered.

Postprint §
DOI: 10.5445/IR/1000140413
Veröffentlicht am 18.09.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 17.09.2021
Sprache Englisch
Identifikator KITopen-ID: 1000140413
Erschienen in ETMM13 Proceedings
Veranstaltung 13th International ERCOFTAC symposium on engineering, turbulence, modelling and measurements (ETMM 2021), Rhodos, Griechenland, 15.09.2021 – 17.09.2021
Schlagwörter roughness, turbulent flows, secondary motion, parametric forcing
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