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Manuel Lombardini
Post-Doc, Aeronautics

We present a 3D fluid simulation of the turbulent mixing driven by an imploding cylindrical shock impacting, at a Mach number of 1.3, a perturbed interface separating light air (black) from heavy SF6 (yellow, 5 times denser). During the implosion phase, we observe mushroom-like structures characteristic of the Richtmyer-Meshkov instability. The subsequent explosion, also known as re-shock, is responsible for the flow to become turbulent and a wide range of scales to develop self-similarly (fractals). A 3D perspective view as well as 2D planar slices show the growth of axial and azimuthal modes within the mixing layer. Some details: The gases are initially quiescent at ambient temperature and pressure, and are separated by an interface at a radial distance of 1m from the axis. The initial perturbation wavelength is 100 times larger than the finest grid size, which is itself about 100 times larger than the smallest physical scale in the flow—the Kolmogorov scale—where the viscous dissipation of energy occurs. The animation runs for more than 10ms and data are sampled about every 0.5ms.


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