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Modifications of the near-wall structures in thermally induced three-dimensional turbulent boundary layer
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10.1063/1.4824777
/content/aip/journal/pof2/25/10/10.1063/1.4824777
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/10/10.1063/1.4824777
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic representation of the vertical channel.

Image of FIG. 2.
FIG. 2.

Budget of turbulence kinetic energy at different grid resolutions.

Image of FIG. 3.
FIG. 3.

Streamwise and spanwise mean velocity components.

Image of FIG. 4.
FIG. 4.

Polar plot.

Image of FIG. 5.
FIG. 5.

RMS of vorticity fluctuations; thick lines correspond to buoyancy induced 3DTBL and thin lines correspond to 2DTBL.

Image of FIG. 6.
FIG. 6.

Budget of turbulence kinetic energy; thick lines correspond to buoyancy induced 3DTBL and thin lines correspond to 2DTBL.

Image of FIG. 7.
FIG. 7.

Turbulence structure parameters a.

Image of FIG. 8.
FIG. 8.

RMS streamwise vorticity fluctuations.

Image of FIG. 9.
FIG. 9.

RMS streamwise vorticity fluctuations based on its sign with different thresholds; (a) positive only and (b) negative only.

Image of FIG. 10.
FIG. 10.

Joint probability density functions; (a) JPDF of ′ and ′; (b) weighted JPDF; (c) conditioned weighted JPDF with positive ω′; and (d) conditioned weighted JPDF with negative ω′. Thin lines in (c) and (d) correspond to 2DTBL.

Image of FIG. 11.
FIG. 11.

Contribution of each quadrant to the primary Reynolds shear stress and thin lines refer to non-buoyant channel.

Image of FIG. 12.
FIG. 12.

Conditional average for strong ′ at + ∼ 18; (a) ′; (b) ω′; (c) −λ′; strong arising ′ > 1.4 (——); and strong sinking ′ < −1.4 (······).

Image of FIG. 13.
FIG. 13.

Cross-stream conditional average for strong streamwise vorticity; left column refers to ⟨′⟩ with contour intervals 0.15; right column refers to ⟨′⟩ with contours intervals 0.15; upper row refers to negative ω′; middle row refers to positive ω′; lower row refers to general sign of ω′; and bold lines refer to the location and shape of the vortices.

Image of FIG. 14.
FIG. 14.

Conditional average fields in cross stream plane cutting strong vortices; (a) negative; (b) positive; and contour levels of −′ have 0.15 interval spacing.

Image of FIG. 15.
FIG. 15.

Schematic of near-wall turbulence structures of buoyancy-driven 3DTBL flow in a frame moving with the center of the vortices.

Image of FIG. 16.
FIG. 16.

Iso-surface of the conditional averaged vortices detected by −λ′ ∼ 0.015 embedded over low speed streaks; (a) negative vortices; (b) positive vortices; and contours levels of ′ have 0.2 interval spacing.

Image of FIG. 17.
FIG. 17.

Low-speed streaks spacing.

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/content/aip/journal/pof2/25/10/10.1063/1.4824777
2013-10-16
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Modifications of the near-wall structures in thermally induced three-dimensional turbulent boundary layer
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/10/10.1063/1.4824777
10.1063/1.4824777
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