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This page is a summary of: Experimental assessment of mixing layer scaling laws in Rayleigh-Taylor instability, Physical Review Fluids, September 2022, American Physical Society (APS),
DOI: 10.1103/physrevfluids.7.093503.
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Rayleigh-Taylor instability in confined porous media: Experiment (Hele-Shaw cell) vs Simulation
Time-dependent evolution of dimensionless concentration field C* obtained experimentally (Ra =19789, left) and numerically ([3],Ra = 19953, right). The dimensionless (t∗) and corresponding dimensional (t) time instants at which the fields refer are explicitly indicated. Note that dimensionless experimental domain size is Ra × Ra, whereas this simulation is performed in a domain of size πRa /4 ×Ra. Therefore, for better comparison, only a portion of the experimental domain is shown.
Rayleigh-Taylor instability in confined porous media: Time evolution of the fingers' number
Time-dependent evolution of the fingers number and corresponding concentration field for Ra = 5.43 × 10^4. The dimensionless concentration field (C∗) and the space-time map, consisting of the evolution of the concentration field along the centerline, C∗ (x∗, z∗ = Ra /2, t∗), are shown. To compute the finger number, the space-time map is binarized, choosing C∗ = 1/2 as threshold. The concentration profile (red solid line) and the discretized profile (black solid line) measured along the centerline at t∗ ≈ 1.1 × 10^5 are also reported as a function of the horizontal coordinate x∗. Finally, the time-dependent finger number is computed from the binarized field (white line) and from the power-averaged mean wavenumber.
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