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Mixing of two liquids with different diffusivities

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Published on Mar 3, 2011

FEFLOW simulation of a double-diffusion experiment carried out by Pringle et al. (Transp. Porous Media 47 (2002) 1, 195-214). The Hele-Shaw cell is filled with a sucrose solution over a denser sodium chloride solution. Despite the initially stable density layering, fingers form because of the different diffusivities of the two solutions. The colouring represents the concentration of a dye added in low concentration.
The white wiggles at the tips of the fingers are little oscillations (numerical instabilities) highlighted by exaggerating the coloring in the animation. By running the simulation on a finer mesh, it is possible to avoid these.

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