Rohlin flows on the Cuntz algebra $O_\infty$
  It is shown that certain quasi-free flows on the Cuntz algebra $O_\infty$ have the Rohlin property and therefore are cocycle-conjugate with each other. This, in particular, shows that any unital separable nuclear purely infinite simple C*-algebra has a Rohlin flow. 
Ola Bratteli, Akitaka Kishimoto, Derek W. Robinson