Discrete particle modeling of granular Rayleigh-Taylor instability

Z. Y. Yu, C. L. Wu*, A. S. Berrouk, K. Nandakumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The gravitational air-grain Rayleigh-Taylor (RT) flow instability in a Hele-Shaw cell was studied using a parallel three-dimensional discrete particle model (DPM). The onset of flow instability and the development of fingering flow structures were well captured by the model. Power spectra analysis of solid volume fraction field indicated the non-linear coarsening process of the fingering flow structures. The sensitivity of the flow patterns to the initial porosity, the Atwood number, and the ratio of particle size to the Hele-Shaw cell width was also demonstrated. The excellent agreement of DPM simulation results with the reported experimental observations proved the robustness and reliability of the numerical approach to model complex multiphase flows such as granular RT instability.

Original languageEnglish
Pages (from-to)260-270
Number of pages11
JournalInternational Journal of Multiphase Flow
Volume77
DOIs
StatePublished - 1 Dec 2015
Externally publishedYes

Keywords

  • Discrete particle/element method
  • Granular flow
  • Rayleigh-Taylor instability

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