2b. Turbulence in a large aspect ratio cell

Movies 1 and 2 start with a smooth velocity field which is small perturbation of an exact solution and satisfies none of the plane Couette symmetries. Movies are solutions of the full Navier-Stokes equations for an incompressible fluid with no-slip boundary condition at the walls.
[movie of plane couette flow] Spatial grid: 96 x 33 x 128;
time step: dt = 0.03125.
  1. [MOVIE] large perturbation from laminar flow (2007-09-11, 20 MB)

  2. [MOVIE] small perturbation from periodic solution (2007-09-11, 25 MB) “Periodic orbits” will be explained below.

The initial state is obtained from is 3 x 4 copies of the P35 orbit, slightly stretched and scaled to fit [Lx, Ly, Lz] = [15, 2, 15] .
aspectLS.html aspectS.html