It's explaned in the following link somewhere in the middle, but it
basically amounts to the vorticity minus the shear, leaving the rotation.
Not my paper of course, but I just tried (unsuccessfully) to replicate the
results.  I couldn't get mine even close to turbulent.

http://www.bgu.ac.il/~yakhot/homepage/publications/JFM_2006.pdf

Say, does anyone know how to get decent render times out of good-looking
media?  Method 3 tends to give me 'slices' and Method 2 needs too many
samples.  Here are my current settings for a smokey-looking wake, but it's
taking quite a while.  Maybe that's to be expected.

media {
  method 3
  intervals 30
  ratio 0.9
  samples 4,4
  jitter 1.0
  aa_level 3
  aa_threshold 0.05
  emission <1,1,1> * 8
  absorption <1,1,1> * 2
  scattering {
    1, <1,1,1>*10
    extinction 2.5
  }
  confidence 0.99
  variance 1/100
  density {
    density_file df3 "output.df3"
    interpolate 1
    color_map {
      [0.0 rgb 0]
      [1.0 rgb 1]
    }
  }
}

 - Ricky


"Kirk Andrews" <kir### [at] hotmailcom> wrote:
> "triple_r" <rre### [at] hotmailcom> wrote:
> > Vortex structure of flow around a cube.  Not happy with it since it's
> > begging for scattering, but I thought I'd plug the simulation results in to
> > POV-Ray and get something pretty.  This took a while, so I might never get
> > around to animaing the other 199 frames.  Seemed worth sharing.
> >
> > - Ricky
>
> This looks neat--but maybe you could explain what you mean by "vortex
> structure of flow"?  Just curious--sounds interesting.
>
> -- Kirk

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