Active nematic materials with substrate friction.

@article{Thampi2014ActiveNM,
  title={Active nematic materials with substrate friction.},
  author={Sumesh P. Thampi and Ramin Golestanian and Julia M. Yeomans},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  year={2014},
  volume={90 6},
  pages={
          062307
        }
}
Active turbulence in dense active systems is characterized by high vorticity on a length scale that is large compared to that of individual entities. We describe the properties of active turbulence as momentum propagation is screened by frictional damping. As friction is increased, the spacing between the walls in the nematic director field decreases as a consequence of the more rapid velocity decays. This leads to, first, a regime with more walls and an increased number of topological defects… 

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