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Hydrodynamic instabilities of propagating interfaces under Darcy's law

Joel Daou* and Prabakaran Rajamanickam†

  • *Contact author: joel.daou@manchester.ac.uk
  • †Present address: Department of Mathematics & Statistics, University of Strathclyde, Glasgow G1 1XQ, UK.
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Phys. Rev. Fluids 10, 013201 – Published 9 January, 2025

DOI: https://doi.org/10.1103/PhysRevFluids.10.013201

Abstract

The hydrodynamic instabilities of propagating interfaces in Hele-Shaw channels or porous media under the influence of an imposed flow and gravitational acceleration are investigated within the framework of Darcy's law. The stability analysis pertains to an interface between two fluids with different densities, viscosities, and permeabilities, which can be susceptible to Darrieus-Landau, Saffman-Taylor, and Rayleigh-Taylor instabilities. A theoretical analysis, treating the interface as a hydrodynamic discontinuity, yields a simple dispersion relation between the perturbation growth rate s and its wave number k in the form s=(ak−bk2)/(1+ck), where a, b, and c are constants determined by problem parameters. The constant a characterizes all three hydrodynamic instabilities, which are long wave in nature. In contrast, b and c, which characterize the influences of local curvature and flow strain on interface propagation speed, typically provide stabilization at short wavelengths comparable to the interface's diffusive thickness. The theoretical findings for Darcy's law are compared with a generalization of the classical work by Joulin and Sivashinsky, which is based on a Euler-Darcy model. The comparison provides a conceptual bridge between predictions based on Darcy's law and those on Euler's equation and offers valuable insights into the role of confinement on interface instabilities in Hele-Shaw channels. Numerical analyses of the instabilities are carried out for premixed flames using a simplified chemistry model and Darcy's law. The numerical results corroborate with the explicit formula with a reasonable accuracy. Time-dependent numerical simulations of unstable premixed flames are carried out to gain insights into the nonlinear development of these instabilities. The findings offer potential strategies for control of interface instabilities in Hele-Shaw channels or porous media. Special emphasis is given to the critical role played by the imposed flow in destabilizing or stabilizing the interface, depending on its direction relative to the interface propagation.

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Phys. Rev. Fluids 10, 013201– Published 9 January, 2025
  • Received 16 October 2024
  • Accepted 10 December 2024
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