Fig. 12: Illustration of the vortex quadrupole that arises when phase domains merge.
From: Phase-field modeling of colloid-polymer mixtures in microgravity

a Plot of ϕ for a BCAT-5 Sample 7 simulation using γ = 130 and P = 10 at (dimensionless) time t = 527. b Zoom-in of the fluid vorticity γ∇ × u in the region enclosed by the red box in (a).