Figure 5.

Computed velocity field for the black ghost knifefish. (a) Velocity vector field on the midsagittal plane generated by the inward counter-propagating waves. The colour map indicates the velocity along the vertical (z) dimension, V_z. (b) Perspective view and velocity field below the fish. (c) Velocity field on a vertical slice midway along the fin (front view). (d) z-vorticity generated by counter-propagating waves (top view). (e) Computed three-dimensional vorticity around the fish. Isosurface of vorticity is equal to 6 s⁻¹.