Controlling the Saffman-Taylor Taylor Instability —

This video shows finite element simulations of the air-fluid interface in a lifting Hele-Shaw cell. These demonstrate the existence of several different self-similar modes of propagation for the same value of the aspect ratio, and also the disordered front propagation readily observed experimentally, caused by application of several random perturbations.

https://downloads.sms.cam.ac.uk/2877363/2877370.mp4