Wake-Induced Oscillatory Paths of Bodies Freely Rising or Falling in Fluids: Supplemental Video 6a

A supplemental video from the 2012 review by Patricia Ern, Frédéric Risso, David Fabre, and Jacques Magnaudet, "Wake-Induced Oscillatory Paths of Bodies Freely Rising or Falling in Fluids," from the Annual Review of Fluid Mechanics.

Supplemental Videos 6a and b show an infinitely thin disk with I* = 0.06 undergoing (a) a highly nonlinear fluttering motion for Ar = 83 and (b) a tumbling motion for Ar = 156 [from a DNS by Auguste (2010)]. The wake is visualized with an isosurface of the λ₂ criterion (Jeong & Hussain 1995), the color reflecting the sign and magnitude of the streamwise vorticity.