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. 2016 Jul;472(2191):20160103. doi: 10.1098/rspa.2016.0103

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© 2016 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Geometries under consideration; (a) a system of N equally spaced radial spokes of unit length and infinitesimal width and (b) a ring of N circular holes of radius a, whose centres are equally spaced around a ring of unit radius; we take $a < \sin (π / N)$ so that the holes do not overlap.