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A slide depicting a 3-D mixing layer between two fluids of different densities in a gravitational field. Known as a Rayleigh-Taylor instability -- a type of turbulent mixing that occurs due to gravity, when a heavy gas is on top of a lighter one -- this mixing plays an essential role in stellar convection and is being studied in this context to help devise and validate statistical models of turbulent fluid mixing at the boundaries of convection zones in stars.
Image credit: Prof. Paul Woodward, Laboratory for Computational Science and Engineering, University of Minnesota
