Linear stability analysis of rapid granular flow down a slope and density wave formation

Namiko Mitarai, Hiizu Nakanishi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The linear stability of rapid granular flow down a slope under gravity to the longitudinal perturbations is analysed using hydrodynamic equations. It is demonstrated that the steady flow uniform along the flow direction becomes unstable to long-wavelength perturbations longitudinal to the flow direction for certain parameter ranges to form a density wave, in contrast to the finite-wavelength instability for transverse perturbations (Forterre and Pouliquen 2002). It is shown that the instability can be understood as the long-wave instability of kinematic waves in a quasi-one-dimensional system. The results are compared with our previous molecular dynamics simulations (Mitarai and Nakanishi 2001), where spontaneous density wave formation was found.

Original languageEnglish
Pages (from-to)309-334
Number of pages26
JournalJournal of Fluid Mechanics
Issue number507
DOIs
Publication statusPublished - May 25 2004

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Linear stability analysis of rapid granular flow down a slope and density wave formation'. Together they form a unique fingerprint.

  • Cite this