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====== Movies of plane Couette flow ======

These movies are designed to convey the main ideas of our research in plane Couette flow. 
For more details, please see [[http://cns.physics.gatech.edu/~gibson/publications/index.html|our papers]]. 


[[movies:hkw | Turbulent dynamics in the HKW cell]]

====== Coherent structures in shear flows ======

 <flashplayer width="720" height="320">file=/movies/tutorial/bigbox.flv&image=/movies/tutorial/bigbox.png&repeat=none</flashplayer>

This movie show the formation of `coherent structures' in plane Couette flow, with fairly large 
aspect-ratio cell: [Lx,Ly,Lz] = [16, 2, 16]. The initial condition is a random perturbation of
laminar flow that meets boundary and divergence-free conditions, has roughly the spectral 
characteristics of turbulent fields, and is about 10% in magnitude of the laminar flow (or 1%
in energy). 

Observe
  *   0 < t < 10 : the random perturbations grow and no apparent order 
  * 10 < t < 100 : there is little discernable order
  * 100 < t < 200 : the flow organizes into alternating +/- streamwise-moving streaks (red/blue) associated with `rolls' visible in the front y,z plane, which draw the + streamwise (red) fluid down from the top wall and - streamwise (blue) up from the bottom
  * 200 < t < 250 : an instability grows and destroys the system of streaks and rolls 
  * 250 < t < 300 : less organized flow ensues, with roll-streak patterns emerging here and there, now and then

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