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About the Cover
Cover:
Comparison of computational (columns 1 and 3) and experimental (columns 2 and 4) flow field around a low Reynolds number hovering wing in one cycle. The chord of the wing (in black) translates from right to left and back while pitching about its center, with parameters characteristic of a fruitfly. Colors represent relative strengths of vorticity, with red indicating counter-clockwise rotation, and blue clockwise rotation. The computated vorticity is obtained from a two-dimensional Navier-Stokes solver, and the experimental vorticity is measured in a cross section at 65% wing span using digital particle image velocimetry. See article by Z. J. Wang, J. M. Birch and M. H. Dickinson (pp. 449-460) for detailed analysis and discussion of the unsteady forces and flow fields in 12 hovering kinematics.
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