Abstract
Highly resolved Direct Numerical Simulations (DNS) of channel flows over staggered arrays of wall mounted cubes are presented and discussed. Attention is concentrated on the spatially averaged mean velocity profiles and their implications for the log law. With an appropriate physically-based definition of the zero-plane displacement height, good log-law fits to the mean velocity profile can only be achieved if the von Karman ‘constant’, κ, is allowed to vary with roughness morphology.
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Acknowledgements
We are grateful for support for one of us (SL) from EPSRC under grant EP/C00000 during visits to Southampton and to the supercomputer centres at...., who provided the large amounts of computational time and memory required for the work.
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Castro, I.P., Leonardi, S. (2010). Very-Rough-Wall Channel Flows: A DNS Study. In: Nickels, T. (eds) IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls. IUTAM Bookseries, vol 22. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9631-9_24
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DOI: https://doi.org/10.1007/978-90-481-9631-9_24
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