Journal article

Direct numerical simulations of Taylor-Couette turbulence: the effects of sand grain roughness

Pieter Berghout, Xiaojue Zhu, Daniel Chung, Roberto Verzicco, Richard JAM Stevens, Detlef Lohse

Journal of Fluid Mechanics | Cambridge University Press (CUP) | Published : 2019

Abstract

Progress in roughness research, mapping any given roughness geometry to its fluid dynamic behaviour, has been hampered by the lack of accurate and direct measurements of skin-friction drag, especially in open systems. The Taylor–Couette (TC) system has the benefit of being a closed system, but its potential for characterizing irregular, realistic, three-dimensional (3-D) roughness has not been previously considered in depth. Here, we present direct numerical simulations (DNSs) of TC turbulence with sand grain roughness mounted on the inner cylinder. The model proposed by Scotti (Phys. Fluids, vol. 18, 031701, 2006) has been modified to simulate a random rough surface of monodisperse sand gra..

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University of Melbourne Researchers

Grants

Awarded by Deutsche Forschungsgemeinschaft


Awarded by PRACE


Funding Acknowledgements

We wish to express our gratitude to J. Will for his help with various illustrations. This project is funded by the Priority Programme SPP 1881 Turbulent Superstructures of the Deutsche Forschungsgemeinschaft. We also acknowledge PRACE for awarding us access to Marconi, based in Italy at CINECA under PRACE project number 2016143351. We also acknowledge PRACE for awarding us access to MareNostrum based in Spain at the Barcelona Supercomputing Centre (BSC) under PRACE project number 2017174146. This work was partly carried out on the national e-infrastructure of SURFsara, a subsidiary of SURF cooperation, the collaborative ICT organization for Dutch education and research.