Figure 7.

Two-dimensional plots (horizontal and vertical cross-sections) of velocity magnitude (U) with flow vectors (size of gray arrows proportional to natural logarithm of velocity magnitude) at an inlet velocity of 0.1 m/s for two C. lyra models

C. lyra morphotypes (i.e., three- and two-vanes) are arranged in rows, while models in different orientations to current (i.e., 0°, 90° and 270°) are arranged in columns. Within each panel, the uppermost plot shows a horizontal cross-section (z = 5 cm), while the bottom two panels show vertical cross-sections (three vaned model at 0°, upper plot y = 28 cm and lower plot y = 0 cm; three vaned model at 90° and 270°, upper plots y = 24 cm and lower plots y = 0 cm; two vaned model at 0°, upper plot y = 28 cm and lower plot y = 0 cm; two vaned model at 90°, y = 0 cm). Results for our two-vaned model at 0° and 180° are identical, and so the latter is not shown. Direction of ambient flow in each panel is from left to right. Scale bar: 10 cm. See also Figures S14 and S15.