2023
DOI: 10.1017/jfm.2023.728
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Direct numerical simulation of turbulent flow in pipes with realistic large roughness at the wall

Mariangela De Maio,
Beatrice Latini,
Francesco Nasuti
et al.

Abstract: We carry out direct numerical simulation (DNS) of turbulent flow in rough pipes. Two types of irregular roughness are investigated, namely a grit-blasted and a graphite surface. A wide range of Reynolds numbers is tested, from the laminar up to the fully rough regime, attempting to replicate Nikuradse's pioneering study. Despite the large relative roughness, outer-layer similarity is achieved at high Reynolds number as hypothesised by Townsend, with deviations from the smooth wall case of 4 % for the grit-blas… Show more

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