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Wall-bounded turbulence and the many faces of surface roughness

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TURW04 - Wall-bounded turbulence: beyond current boundaries

Rough-wall turbulence can be considered the norm rather than the exception, because surfaces rarely remain perfectly smooth over longer periods of time. Historically, investigations of rough-wall turbulence have focussed on the fluid dynamics aspects, with the wall roughness itself receiving little attention. More recently, the topographies of rough walls and their effects on near-wall turbulence have received increased interest. Surface skewness and effective slope have been identified as key topographical parameters. In this talk, I will discuss and classify topographical parameters that influence the fluid dynamical roughness effect. Using results from recent direct numerical simulations I will show that we need to consider parameters beyond surface skewness and effective slope to fully capture roughness effects.

This talk is part of the Isaac Newton Institute Seminar Series series.

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