Granular rotor as a probe for a nonequilibrium bath

Tomohiko G. Sano, Kiyoshi Kanazawa, Hisao Hayakawa

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


This study numerically and analytically investigates the dynamics of a rotor under viscous or dry friction as a nonequilibrium probe of a granular gas. In order to demonstrate the role of the rotor as a probe for a nonequilibrium bath, the molecular dynamics (MD) simulation of the rotor is performed under viscous or dry friction surrounded by a steady granular gas under gravity. A one-to-one map between the velocity distribution function (VDF) of the granular gas and the angular distribution function for the rotor is theoretically derived. The MD simulation demonstrates that the one-to-one map accurately infers the local VDF of the granular gas from the angular VDF of the rotor, and vice versa.

Original languageEnglish
Article number032910
JournalPhysical Review E
Issue number3
Publication statusPublished - 2016 Sept 30
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics


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