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Modesti, D. (author), Sathyanarayana, Srikanth (author), Salvadore, Francesco (author), Bernardini, Matteo (author)We perform direct numerical simulation of supersonic turbulent channel flow over cubical roughness elements, spanning bulk Mach numbers -, both in the transitional and fully rough regime. We propose a novel definition of roughness Reynolds number which is able to account for the viscosity variations at the roughness crest and should be used...journal article 2022