Scalings of Rayleigh-Taylor Instability at Large Viscosity Contrasts in Porous Media
Nasser Sabet, Hassan Hassanzadeh, A. De Wit, Jalal Abedi
Abstract
The scalings of the Rayleigh-Taylor instability are studied numerically for porous media flows when the denser fluid lying on top of the less dense one is also much more viscous. We show that, above a critical value of the viscosity ratio M, a symmetry breaking of the buoyancy-driven fingers is observed as they extend much further downward than upward. The asymmetry ratio scales as M^{1/2} while the asymptotic flux across the initial contact line, quantifying the mixing between the two fluids, scales as M^{-1/2}. A new fingering mechanism induced by large viscosity contrasts is identified and shows good agreement with experimentally observed dynamics.
Topics & Concepts
BuoyancyInstabilityRayleigh–Taylor instabilityPhysicsViscosityPorous mediumAsymmetryMechanicsRayleigh scatteringMixing (physics)Flux (metallurgy)Symmetry (geometry)Rayleigh numberThermodynamicsConvectionPorosityNatural convectionMaterials scienceOpticsGeometryQuantum mechanicsMetallurgyComposite materialMathematicsFluid Dynamics and Turbulent FlowsLattice Boltzmann Simulation StudiesParticle Dynamics in Fluid Flows