Estimation of the Roughness Function in Turbulent Flows Using the Slope of the Roughness

  • M. De MarchisEmail author
  • B. Milici
  • E. Napoli
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 25)


In the last decades, important efforts have been made to better understand the effects of surface roughness on the mean flow. These studies have been performed investigating turbulent channel flows, turbulent boundary layers or pipe flows. The most evident effect of the roughness is the increase of the overall resistance, corresponding to a decrease of the mean streamwise velocity profile in the logarithmic region. This reduction is known as roughness function \(\varDelta U^+\) (the symbol \(^+\) represents quantities made non dimensional using the friction velocity \(u_{\tau }\), or the viscous length scale \(\nu /u_{\tau }\)).


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Faculty of Engineering and ArchitectureUniversity of Enna “Kore”EnnaItaly
  2. 2.Department of Civil, Environmental, Aerospace, Materials EngineeringUniversity of PalermoPalermoItaly

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