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Sedimentation instabilities: Impact of the fluid compressibility and viscosity

Michael J. Niebling1, Eirik G. Flekkøy1, Knut Jørgen Måløy1, and Renaud Toussaint2

  • 1Department of Physics, University of Oslo, P.O. Box 1048, 0316 Oslo, Norway
  • 2Institut de Physique du Globe de Strasbourg, CNRS, and University of Strasbourg(EOST), 5 rue Descartes, 67084 Strasbourg Cedex, France

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Phys. Rev. E 82, 051302 – Published 11 November, 2010

DOI: https://doi.org/10.1103/PhysRevE.82.051302

Abstract

The effect of an interstitial fluid on the mixing of sedimenting grains is studied numerically in a closed rectangular Hele-Shaw cell. We investigate the impact of the fluid compressibility and fluid viscosity on the dynamics and structures of the granular Rayleigh-Taylor instability. First we discuss the effect of the fluid compressibility on the initial fluid pressure evolution and on the dynamics of the particles. Here, the emerging patterns do not seem highly affected by the compressibility change studied. To characterize the patterns and motion the combined length of the particle trajectories in relation to the movement of the center of mass is analyzed, and the separation of particle pairs is measured as a function of the fluid viscosity.

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Phys. Rev. E 82, 051302– Published 11 November, 2010
  • Received 18 May 2010

© 2010 American Physical Society

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