Active turbulence in active nematics
  Dense, active systems show active turbulence, a state characterised by flow fields that are chaotic, with continually changing velocity jets and swirls. Here we review our current understanding of active turbulence. The development is primarily based on the theory and simulations of active liquid crystals, but with accompanying summaries of related literature. 
Sumesh P. Thampi, Julia M. Yeomans
cond-mat.soft