Collapse of an island (as defined by a KAM surface )due to the motion of a deformable fluid body. The fluid body effectively acted as an internal stirrer and was also shown to replace the island in some instances. Chaotic mixing occurs throughout the rectangular region upon the island collapse.

Reference: Zhang, D. and Zumbrunnen, D. A., "Chaotic Mixing of Two Similar Fluids in the Presence of a Third Dissimilar Fluid," AIChE Journal, Vol. 42, pp. 3301-3309, 1996.