Numerical study on depinning dynamics of fluids interacting with disorder

Yi Gang Cao, Wan Ki Chow

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


We investigate the depinning of two-dimensional fluids interacting with quenched disorder, based on Langevin simulations. For weak disorder the fluids depin elastically and flow in an ordered state. A power-law scaling fit between velocity and driving force can be obtained for the onset of motion in the elastic regime. This is in good agreement with that of colloid, charge density wave, and superconducting vortex systems. With an increasing strength of the disorder, we find a sharp crossover to plastic depinning, accompanied by a substantial increase in the depinning force. The scaling fit obtained in the elastic regime becomes invalid when plastic flow occurs. In the plastic regime, the fluids flow in channels and the hexatic order decays exponentially with drives.
Original languageEnglish
Pages (from-to)619-622
Number of pages4
JournalCommunications in Theoretical Physics
Issue number4
Publication statusPublished - 15 Oct 2004


  • Elastic depinning
  • Fluids
  • Plastic depinning

ASJC Scopus subject areas

  • General Physics and Astronomy


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