Anomalous diffusion and Lévy distribution of particle velocity in soft-mode turbulence in electroconvection

Koyo Tamura, Yoshiki Hidaka, Yusril Yusuf, Shoichi Kai

Research output: Contribution to journalConference articlepeer-review

28 Citations (Scopus)


We study the complex behavior in soft-mode turbulence (SMT), a recently discovered type of spatiotemporal chaos observed in electrohydrodynamic instability (EHD) of a nematic liquid crystal with homeotropic alignment. A particle, small compared to the characteristic length of the macroscopic flow, injected in SMT travels with random velocity such as an active Brownian motion. Tracking the particle trajectory induces changes in the flow velocity as a function of space and time (the Lagrange picture). The mean amplitude of the velocity is linearly proportional to the control parameter ε, normalized voltage in EHD. The probability density distribution of the particle velocity changes from Lévy for small ε to Gaussian distribution for large ε through intermediate distributions. The different regimes of anomalous diffusions are also observed. The stochastic properties of SMT are discussed based on these results.

Original languageEnglish
Pages (from-to)157-168
Number of pages12
JournalPhysica A: Statistical Mechanics and its Applications
Publication statusPublished - Apr 1 2002
Event21th IUPAP Conference on Invited Papares (STATPHYS 21) - Cancun, Mexico
Duration: Jul 15 2001Jul 21 2001

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Statistics and Probability


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