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- W2051845221 abstract "Time-resolved DPIV measurements performed in wall parallel planes at several wall normal locations in a turbulent boundary layer (TBL) are used to illuminate the distribution of wall parallel velocities in a three-dimensional energy spectrum over streamwise,spanwise, and temporal wavelengths. To our knowledge, this is the first time this type of spectral distribution has been reported. Slices of the 3D spectrum can give insight into the propagation of different scales in the ow as well as the streamwise and spanwise extent ofdominant scales. Measurements were performed at three wall normal locations, y^+ = 34; 108; and 278, in a zero pressure gradient TBL at Re_τ = 470 . Two high speed cameras placedside-by-side in the streamwise direction give a 10δ streamwise field of view with a time stepof Δt^+ = 0:5 between consecutive fields. Far from the wall the convection velocities of all scales are very close to the local mean velocity in agreement with the work of Dennis and Nickels, while at y^+ = 34 it was found that all measured scales in the flow convect fasterthan the local mean in agreement with Krogstad et. al. The variation of the convection velocity with scale and distance from the wall will be discussed." @default.
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- W2051845221 date "2010-06-28" @default.
- W2051845221 modified "2023-10-16" @default.
- W2051845221 title "A Study of Convection Velocities in a Zero Pressure Gradient Turbulent Boundary Layer" @default.
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- W2051845221 doi "https://doi.org/10.2514/6.2010-4474" @default.
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