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This document summarizes a study investigating how roughness elements can generate and sustain turbulence in an initially laminar channel flow at low Reynolds numbers. Direct numerical simulations were performed on a channel with square bars mounted in a staggered formation on both walls. It was found that this generated fully developed turbulence similar to that seen in rough wall turbulent channels at much higher Reynolds numbers. Key characteristics like the mean velocity profile and turbulent kinetic en

Author

Oliver Hou

Language

EN