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• W2115453505 abstract "Smooth flat-plate turbulent boundary layers (TBLs) have been studied for nearly a century. However, there is a relative dearth of measurements at Reynolds numbers typical of full-scale marine and aerospace transportation systems ( Re θ = U e θ/ν > 10 5 , where U e = free-stream speed, θ = TBL momentum thickness and ν = kinematic viscosity). This paper presents new experimental results for the TBL that forms on a smooth flat plate at nominal Re θ values of 0.5 × 10 5 , 1.0 × 10 5 and 1.5 × 10 5 . Nominal boundary layer thicknesses (δ) were 80–90mm, and Karman numbers (δ + ) were 17000, 32000 and 47000, respectively. The experiments were conducted in the William B. Morgan Large Cavitation Channel on a polished ( k + < 0.2) flat-plate test model 12.9m long and 3.05m wide at water flow speeds up to 20ms −1 . Direct measurements of static pressure and mean wall shear stress were obtained with pressure taps and floating-plate skin friction force balances. The TBL developed a mild favourable pressure gradient that led to a streamwise flow speed increase of ~2.5% over the 11m long test surface, and was consistent with test section sidewall and model surface boundary-layer growth. At each Re θ , mean streamwise velocity profile pairs, separated by 24cm, were measured more than 10m from the model's leading edge using conventional laser Doppler velocimetry. Between these profile pairs, a unique near-wall implementation of particle tracking velocimetry was used to measure the near-wall velocity profile. The composite profile measurements span the wall-normal coordinate range from y + < 1 to y > 2δ. To within experimental uncertainty, the measured mean velocity profiles can be fit using traditional zero-pressure-gradient (ZPG) TBL asymptotics with some modifications for the mild favourable pressure gradient. The fitted profile pairs satisfy the von-Kármán momentum integral equation to within 1%. However, the profiles reported here show distinct differences from equivalent ZPG profiles. The near-wall indicator function has more prominent extrema, the log-law constants differ slightly, and the profiles' wake component is less pronounced." @default.
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• W2115453505 date "2010-12-06" @default.
• W2115453505 modified "2023-09-27" @default.
• W2115453505 title "The mean velocity profile of a smooth-flat-plate turbulent boundary layer at high Reynolds number" @default.
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• W2115453505 doi "https://doi.org/10.1017/s0022112010003952" @default.
• W2115453505 hasPublicationYear "2010" @default.
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