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ADDITIONAL TECHNICAL PAPERS

Structure Inclination Angle in a Turbulent Adverse Pressure Gradient Boundary Layer

[+] Author and Article Information
Per-Åge Krogstad

Department of Mechanics, Thermo and Fluid Dynamics, The Norwegian University of Technology and Science, N-7491 Trondheim, Norwaye-mail: Per.A.Krogstad@mtf.ntnu.no

Jon Harald Kaspersen

Ultrasound Division, Sintef Unimed, N-7465 Trondheim, Norwaye-mail: Jon.H.Kaspersen@unimed.sintef.no

J. Fluids Eng 124(4), 1025-1033 (Dec 04, 2002) (9 pages) doi:10.1115/1.1511161 History: Received May 30, 2000; Revised January 31, 2002; Online December 04, 2002
Copyright © 2002 by ASME
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References

Figures

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Ratio between the first and second principal stresses. Symbols as in Fig. 1.
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Directions for the largest principal stresses. Symbols as in Fig. 1.
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Spectra for the zero pressure gradient layer at y/δ=0.10. Wavelet spectrum: —•—; Fourier spectrum: —○—.
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Two-point velocity correlations, ρuu, in the (x,y)-plane as function of wavelet scale. Contour levels: −0.7 to 0.9 with 0.2 increments. Left: APG, Right: ZPG.
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Mexican hat (solid line) and Haar (dotted line) wavelets.
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Comparison between correlations obtained using the Mexican hat (solid line) and Haar (dotted line) wavelets. ΔX*≈4.8.
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Correlation inclination angle as function of wavelet scale, ΔX*. Reference probe at Y0*≈0.1. Adverse pressure gradient: filled symbols, Zero pressure gradient: open symbols. ○: Uc taken as the mean velocity of the reference probe. □: Uc taken as the average mean velocity over the ρuu=0.3 contour.
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Two-point velocity correlations, ρvv, in the (x,y)-plane as function of wavelet scale. Contour levels: −0.7 to 0.9 with 0.2 increments. Left: APG, Right: ZPG.
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Two-point velocity correlations, ρuu, in the (x,y)-plane. Contour levels: 0.1, 0.2, 0.3, 0.5, and 0.8. (a) Adverse pressure gradient, (b) Zero pressure gradient. Dashed lines: 45 deg inclination; Solid line: inclinations of the most energetic structures.
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Distributions of the largest principal stresses. Symbols as in Fig. 1.
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Velocity defect data for the zero (○) and adverse (•) pressure gradient boundary layers
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Shear stresses. Symbols as in Fig. 1.

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