6533b86cfe1ef96bd12c7fb5

RESEARCH PRODUCT

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

M. De MarchisBarbara MiliciEnrico Napoli

subject

Physics::Fluid DynamicsLength scalePhysicsLogarithmTurbulenceSurface roughnessBoundary (topology)Mean flowGeometryShear velocitySurface finish

description

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

yearjournalcountryeditionlanguage
2019-01-01
https://doi.org/10.1007/978-3-030-04915-7_73