Journal: Journal of the Royal Society Interface

Article Title: Comparative aerodynamic performance of flapping flight in two bat species using time-resolved wake visualization

doi: 10.1098/rsif.2011.0015

Figure Lengend Snippet: Transverse PIV frames (y–z) behind the bats flying at 6 m s−1. (a,c) Downstroke for G. soricina and L. yerbabuenae, respectively, while (b,d) the equivalent upstrokes. The symmetry line behind the bat body is indicated by the black vertical dot-dash line. The in-plane velocity vectors are shown, and the surface colour shows the stream-wise vorticity. During the downstroke, the tip-vortex is visible as the dark blue areas indicated with a grey dot in the centre, and the root vortices are the orange areas indicated with a blue dot. During the upstroke, the reversed vortex dipole is visible as the blue and red vorticity patch connected with a red bar. The vorticity colour bar ranges from −300 to 300 s−1, while vorticity below the threshold of ±60 s−1 is not shown. The reference velocity vector on the bottom left corner of (e) is equal to 10 m s−1. Panel sizes are 175 mm by 205 mm for G. soricina and 200 mm by 205 mm for L. yerbabuenae (width by height).

Article Snippet: The resulting three-component transverse PIV data ({ u, v, w } velocity matrix) are imported into a custom-made Matlab (7.7.0.471, R2008b) PIV analysis program, in which the location, vorticity and circulation of different vortices within a PIV frame can be measured.

Techniques: Plasmid Preparation