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Volumetric measurements and simulations of the vortex structures generated by low aspect ratio plunging wings
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10.1063/1.4808440
/content/aip/journal/pof2/25/6/10.1063/1.4808440
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/6/10.1063/1.4808440
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Experimental setup for volumetric velocimetry measurements.

Image of FIG. 2.
FIG. 2.

Schematics of the planform shapes.

Image of FIG. 3.
FIG. 3.

Isometric and side views of the measurement volumes used to interrogate the entire near surface flowfield of the rectangular / = 1 wing ( = 20°). The green shaded region represents laser illumination.

Image of FIG. 4.
FIG. 4.

Time-averaged lift coefficient for various wings at angle of attack = 20°; amplitude = 0.15c.

Image of FIG. 5.
FIG. 5.

(a)–(l) A 12-phase comparison between CFD and experimental results, for the / = 1 rectangular wing at = 0.65, showing / = 20.

Image of FIG. 6.
FIG. 6.

A comparison of non-dimensional spanwise vorticity, = / , between CFD, PIV, and volumetric velocimetry measurements, at a plane halfway along the span of the / = 1 rectangular wing (/ = 0.5).

Image of FIG. 7.
FIG. 7.

(a)–(f) Isometric views of the vortices that surround the / = 1 rectangular wing at 4 phases in the cycle for various frequencies: (a) = 0.4, (b) = 0.6, (c) = 0.8. (d) = 1.0, (e) = 1.2, and (f) = 1.35. Iso-surfaces represent constant vorticity magnitude, |ω| = |/ | = 8, 15, and 25 and colour maps indicate spanwise vorticity.

Image of FIG. 8.
FIG. 8.

(a)–(f) Side views of the vortices that surround the / = 1 rectangular wing at 4 phases in the cycle for various frequencies: (a) = 0.4, (b) = 0.6, (c) = 0.8. (d) = 1.0, (e) = 1.2, and (f) = 1.35. Iso-surfaces represent constant vorticity magnitude, | | = |/ | = 8, 15, and 25 and colour maps indicate spanwise vorticity.

Image of FIG. 9.
FIG. 9.

A side view of the Q-criterion iso-surfaces surrounding the / = 1 rectangular wing at = 0.75 for various frequencies: (a) = 0.4, (b) = 0.6, (c) = 0.8, (d) = 1.0, (e) = 1.2, and (f) = 1.35. Iso-surfaces represent constant Q-criterion, / = 15, 30, and 45 and colour maps represent streamwise vorticity.

Image of FIG. 10.
FIG. 10.

An isometric view of the lower surface of the / = 1 wing at = 0.75, for = 1.35. Iso-surfaces represent constant Q-criterion, / = 15, 30, and 45 and colour maps represent streamwise vorticity.

Image of FIG. 11.
FIG. 11.

Cross-stream slices through the tip vortex of the / = 1 rectangular wing, taken 0.1c from the trailing edge, show non-dimensionalised vorticity along the x-axis (left column), = | / |, and non-dimensionalised spanwise velocity (right column), = / .

Image of FIG. 12.
FIG. 12.

(a)–(d) A comparison between planforms at = 0.6. Iso-surfaces represent constant vorticity magnitude, || = 7, 15, and 25 and colour maps represent spanwise vorticity.

Image of FIG. 13.
FIG. 13.

(a)–(d) A comparison between planforms at = 0.8. Iso-surfaces represent constant vorticity magnitude, || = 7, 15, and 25 and colour maps represent spanwise vorticity.

Image of FIG. 14.
FIG. 14.

(a)–(d) A comparison between planforms at = 1.0. Iso-surfaces represent constant vorticity magnitude, || = 7, 15, and 25 and colour maps represent spanwise vorticity.

Image of FIG. 15.
FIG. 15.

Vortex core tracking for the / = 2 elliptical wing at (a) = 0.6, (b) = 0.8, and (c) = 1.0, viewed from downstream of the wing. The wing corresponds to its location at the bottom of the cycle.

Image of FIG. 16.
FIG. 16.

Vortex core tracking for the / = 2 (a) rectangular and (b) elliptical wings, at = 0.75, viewed from different angles. The wing corresponds to its location at the bottom of the cycle.

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/content/aip/journal/pof2/25/6/10.1063/1.4808440
2013-06-12
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Volumetric measurements and simulations of the vortex structures generated by low aspect ratio plunging wings
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/6/10.1063/1.4808440
10.1063/1.4808440
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