Figure 7

Example of vorticity. Examples of the vorticity $\left(\mathbf{v}\times \widehat{\mathbf{p}}\right){|}_z$ scaled by a characteristic velocity v for k_A/k_D = 35, k_Mτ _b = 7.5 × 10^-3 and P/P₀ = 0.024. For clarity error bars are only given for a single run. The thick horizontal line segments denote the mean value up to the time when the vortex contracts to a semi-aster, and are plotted up to this time.