Figure 5.

Cross-sectional pressure distribution and velocity fields at the middle cross-section (one wavelength from either end) of the concentric elliptical annulus model with ellipticity α/β = 1.667. Values are plotted at three different phases of the peristaltic wave: beginning, middle and end (left to right). The displacement of the wall wave is plotted above at the top, with red vertical dashed lines marking the three times of the corresponding cross-sections. The colour scale indicates the magnitude of the dimensionless velocity magnitude, and the copper scale indicates the dimensionless pressure.