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活动类型：学术报告

主讲人：张强(City University of Hong Kong)

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活动内容：

We study the fingering instabilities induced by a shock that propagates  across a perturbed interface between difference fluid and between different granular particles. We show that if the collisions between the particles   conserve energy, then the growth of the fingering instability in fluids and  that in granular materials are very similar. However, our study also showed  that energy loss during particle collisions, even when very small, causes growth of the fingers in granular systems to be dramatically different from  that in fluids.
    The fingers formed by the light particles grow faster and become longer and  narrower than the fingers formed by the heavy particles. This is completely  opposite to the behavior of fingers in fluids, In addition, the finger  composed of light particles collapse into an extremely compact, tortuous  filament, and diffusive mixing between particle types at the particle scale  is heavily suppressed.