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Turbulent flow in rough wall channels : validation of RANS models
Publikationstyp
Journal Article
Date Issued
2015-11-20
Sprache
English
Author(s)
Jin, Yan
TORE-URI
Journal
Volume
122
Start Page
34
End Page
46
Publisher DOI
Scopus ID
Publisher
Elsevier Science
Two kinds of a generic roughness on plane channel walls have been investigated by standard RANS turbulence models. The objective was to accurately predict mean flow quantities for steady incompressible flows through rough wall channels. Seven turbulence models have been used in a special validation procedure based on direct numerical simulation (DNS) results for several values of the roughness spacing and the Reynolds number (which here are the free parameters). In addition to single RANS solutions also a parameter expansion method (PEM) is examined with respect to its capability to accurately predict rough wall channel flows for an extended range of parameters, i.e. for various roughness heights and Reynolds numbers. Those methods that could be validated were then used to predict results for parameters beyond the validation range. Their accuracy can be assessed by comparison with reasonably extended DNS results. The final conclusion is that RANS solutions only with certain turbulence models and over some parameter ranges can be used to predict turbulent channel flows influenced by wall roughness.
Subjects
DNS
PEM
RANS
Rough wall
Turbulent flow
DDC Class
530: Physik
600: Technik
620: Ingenieurwissenschaften