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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)

Abstract

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 \(\nu /u_{\tau }\)).

References

  1. 1.
    Flack, K.A., Schultz, M.P.: Roughness effects on wall-bounded turbulent flows. Phys. Fluids 26(103105), 1–17 (2014)Google Scholar
  2. 2.
    Yuan, J., Piomelli, U.: Estimation and prediction of the roughness function on realistic surfaces. J. Turbul. 15(6), 350–365 (2014)MathSciNetCrossRefGoogle Scholar
  3. 3.
    Mejia-Alvarez, R., Christensen, K.T.: Wall-parallel stereo particle-image velocimetry measurements in the roughness sublayer of turbulent flow overlying highly irregular roughness. Phys. Fluids 25, 115109 (2013)CrossRefGoogle Scholar
  4. 4.
    Rao, V.N., Jefferson-Loveday, R., Tucker, P.G., Lardeau, S.: Large eddy simulations in turbines: influence of roughness and free-stream turbulence. Flow Turbul. Combust. 92(1–2), 543–561 (2014)CrossRefGoogle Scholar
  5. 5.
    Napoli, E., Armenio, V., De Marchis, M.: The effect of the slope of irregularly distributed roughness elements on turbulent wall-bounded flows. J. Fluid Mech. 613, 385–394 (2008)CrossRefGoogle Scholar
  6. 6.
    Schultz, M.P., Flack, K.A.: Turbulent boundary layers on a systematically varied rough wall. Phys. Fluids 21(015104), 1–9 (2009)zbMATHGoogle Scholar
  7. 7.
    De Marchis, M.: Large eddy simulations of roughened channel flows: estimation of the energy losses using the slope of the roughness. Comput. Fluids 140, 148–157 (2016)MathSciNetCrossRefGoogle Scholar
  8. 8.
    De Marchis, M., Milici, B., Napoli, E.: Numerical observations of turbulence structure modification in channel flow over 2D and 3D rough walls. Int. J. Heat Fluid Flow 56, 108–123 (2015)CrossRefGoogle Scholar

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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