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The complex aerodynamic footprint of desert locusts revealed by large-volume tomographic particle image velocimetry.

Henningsson P, Michaelis D, Nakata T, Schanz D, Geisler R, Schröder A, Bomphrey RJ - J R Soc Interface (2015)

Bottom Line: Particle image velocimetry has been the preferred experimental technique with which to study the aerodynamics of animal flight for over a decade.We confirm the presence of wake deformation behind desert locusts and quantify the effect of that deformation on estimates of aerodynamic force and the efficiency of lift generation.We present previously undescribed vortex wake phenomena, including entrainment around the wing-tip vortices of a set of secondary vortices borne of Kelvin-Helmholtz instability in the shear layer behind the flapping wings.

View Article: PubMed Central - PubMed

Affiliation: Department of Biology, Lund University, Lund, Sweden.

No MeSH data available.


Related in: MedlinePlus

(a) Dynamics of span efficiency throughout the wing stroke at the five different downstream locations. (b) Weight support throughout the wing stroke at the five different downstream locations. Darker shaded lines indicate shorter downstream distance between the animal and the putative measurement plane; from 10 mm closest to the locust to 210 mm, in increments of 50 mm. (c) Standard deviation of span efficiency between the five downstream locations. (d) Standard deviation of weight support.
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RSIF20150119F7: (a) Dynamics of span efficiency throughout the wing stroke at the five different downstream locations. (b) Weight support throughout the wing stroke at the five different downstream locations. Darker shaded lines indicate shorter downstream distance between the animal and the putative measurement plane; from 10 mm closest to the locust to 210 mm, in increments of 50 mm. (c) Standard deviation of span efficiency between the five downstream locations. (d) Standard deviation of weight support.

Mentions: To examine this further, we plotted ei and L/W over the wingbeat for each of the five downstream locations of one of the individuals. Standard deviation of the parameters at each time step was used to illustrate where in the wingbeat the biggest discrepancy between locations occurs (figure 7). It is clear from this figure that ei has the lowest discrepancy during the period in the wing stroke where most of the lift is produced, whereas L/W shows the opposite trend; around mid-downstroke when the peak of lift occurs the discrepancy between measurement locations close and far is also the highest.Figure 7.


The complex aerodynamic footprint of desert locusts revealed by large-volume tomographic particle image velocimetry.

Henningsson P, Michaelis D, Nakata T, Schanz D, Geisler R, Schröder A, Bomphrey RJ - J R Soc Interface (2015)

(a) Dynamics of span efficiency throughout the wing stroke at the five different downstream locations. (b) Weight support throughout the wing stroke at the five different downstream locations. Darker shaded lines indicate shorter downstream distance between the animal and the putative measurement plane; from 10 mm closest to the locust to 210 mm, in increments of 50 mm. (c) Standard deviation of span efficiency between the five downstream locations. (d) Standard deviation of weight support.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4528577&req=5

RSIF20150119F7: (a) Dynamics of span efficiency throughout the wing stroke at the five different downstream locations. (b) Weight support throughout the wing stroke at the five different downstream locations. Darker shaded lines indicate shorter downstream distance between the animal and the putative measurement plane; from 10 mm closest to the locust to 210 mm, in increments of 50 mm. (c) Standard deviation of span efficiency between the five downstream locations. (d) Standard deviation of weight support.
Mentions: To examine this further, we plotted ei and L/W over the wingbeat for each of the five downstream locations of one of the individuals. Standard deviation of the parameters at each time step was used to illustrate where in the wingbeat the biggest discrepancy between locations occurs (figure 7). It is clear from this figure that ei has the lowest discrepancy during the period in the wing stroke where most of the lift is produced, whereas L/W shows the opposite trend; around mid-downstroke when the peak of lift occurs the discrepancy between measurement locations close and far is also the highest.Figure 7.

Bottom Line: Particle image velocimetry has been the preferred experimental technique with which to study the aerodynamics of animal flight for over a decade.We confirm the presence of wake deformation behind desert locusts and quantify the effect of that deformation on estimates of aerodynamic force and the efficiency of lift generation.We present previously undescribed vortex wake phenomena, including entrainment around the wing-tip vortices of a set of secondary vortices borne of Kelvin-Helmholtz instability in the shear layer behind the flapping wings.

View Article: PubMed Central - PubMed

Affiliation: Department of Biology, Lund University, Lund, Sweden.

No MeSH data available.


Related in: MedlinePlus