Figure 1.

The geometric phase for the journal-bearing flow with cylinder radii R₁ = 1.0, R₂ = 0.3 and eccentricity ε = 0.4, taken around a closed loop with θ₁ = θ₂ = 6 radians. The four segments of the loop are plotted in different colours (red, green, blue, magenta) to enable their contributions to the particle motion to be seen. The trajectories of two passive scalars initially at x = 0.5, y = 0.0 and x = 0.6, y = 0.0 are shown. (Online version in colour.)