Interfacial Instabilities in Torsional Flows
  In this fluid dynamics video, we show current findings on the morphology of an oil-water interface in a torsional flow produced by rotating the upper lid of a cylindrical tank. This video was submitted as part of the Gallery of Fluid Motion 2012 which is showcase of fluid dynamics videos. 
C.-Y. Lai, Y.-T Sun, C.-C. Chang, Y.-Y. Chen, P. E. Arratia and J.-C.   Tsai
physics.flu-dyn