- Mechanical Engineering - Research Publications
Mechanical Engineering - Research Publications
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ItemEfficacy of single-component MTV to measure turbulent wall-flow velocity derivative profiles at high resolutionElsnab, JR ; Monty, JP ; White, CM ; Koochesfahani, MM ; Klewicki, JC (SPRINGER, 2017-09)
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ItemTowards Reconciling the Large-Scale Structure of Turbulent Boundary Layers in the Atmosphere and LaboratoryHutchins, N ; Chauhan, K ; Marusic, I ; Monty, J ; Klewicki, J (SPRINGER, 2012-11)
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ItemSimultaneous skin friction and velocity measurements in high Reynolds number pipe and boundary layer flowsBaidya, R ; Baars, WJ ; Zimmerman, S ; Samie, M ; Hearst, RJ ; Dogan, E ; Mascotelli, L ; Zheng, X ; Bellani, G ; Talamelli, A ; Ganapathisubramani, B ; Hutchins, N ; Marusic, I ; Klewickil, J ; Monty, JP (Cambridge University Press (CUP), 2019-07-25)Streamwise velocity and wall-shear stress are acquired simultaneously with a hot-wire and an array of azimuthal/spanwise-spaced skin friction sensors in large-scale pipe and boundary layer flow facilities at high Reynolds numbers. These allow for a correlation analysis on a per-scale basis between the velocity and reference skin friction signals to reveal which velocity-based turbulent motions are stochastically coherent with turbulent skin friction. In the logarithmic region, the wall-attached structures in both the pipe and boundary layers show evidence of self-similarity, and the range of scales over which the self-similarity is observed decreases with an increasing azimuthal/spanwise offset between the velocity and the reference skin friction signals. The present empirical observations support the existence of a self-similar range of wall-attached turbulence, which in turn are used to extend the model of Baars et al. (J. Fluid Mech., vol. 823, p. R2) to include the azimuthal/spanwise trends. Furthermore, the region where the self-similarity is observed correspond with the wall height where the mean momentum equation formally admits a self-similar invariant form, and simultaneously where the mean and variance profiles of the streamwise velocity exhibit logarithmic dependence. The experimental observations suggest that the self-similar wall-attached structures follow an aspect ratio of in the streamwise, spanwise and wall-normal directions, respectively.
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ItemReproducing AS/NZS terrain-type wind profiles in a short-fetch wind-tunnelKevin, K ; Philip, J ; Monty, J ; Klewicki, J (AWES, 2018)