Abstract
A proper orthogonal decomposition (POD) analysis is carried out with particle image velocity (PIV) measurements of a turbulent boundary layer over a rough wall made of transverse square bars. Two bar spacings were investigated (\(w/k = 3\)and 7, w is the bar spacing and k the bar diameter). This ratio affects the energy distribution amongst the POD modes throughout the boundary layer,the higher modes, i.e. the relatively small-scale and less energetic motions, being themost perturbed. The first few near-wall POD modes were also affected by the spacing.
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Djenidi, L., Antonia, R., Amielh, M., Anselmet, F. (2010). POD Analysis of the Near-Wall Region of a Rough Wall Turbulent Boundary Layer. 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_7
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DOI: https://doi.org/10.1007/978-90-481-9631-9_7
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