videoplayback-【EML Webinar】力学研讨会 "含粒子湍流的多/跨尺度分析" by 郑晓静 院士

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• 起个昵称为什么这么男:Sand/dust storm is a kind of extreme dynamic process in natural environment dominated by windblown sand particles and air turbulence. It leads to the sand transport, the formation and evolution of sand ripples and dune fields, the charge-to-mass ratio of sand particles, as well as the electric field in sandstorms which all demonstrate multi-scale characteristics in time and space. In this presentation, two types of trans-scale approaches proposed by the Center for Particle-laden Turbulence of Lanzhou University will be outlined. The first one is a trans-scale model to simulate and reproduce the formation and evolution process of dune fields with hundreds of square kilometers over decades; and the second one is a trans-scale inversion approach to reconstruct the electric structure of sand/dust storms and the distribution of sand-grain charge-to-mass ratio based on locally observed electric field data.
• 起个昵称为什么这么男:The insights gained from the two issues are: in the former case, the gap from small- to large-scale processes can be linked through the statistical analysis of small-scale processes so as to extract the statistics that reflect the nature of the problem; while in the latter case, the downscaling leap from large- to small-scale physics is an ill-posed problem in mathematics, the inversion of which requires a regularization operation as a preliminary. Finally, key issues needed to be highlighted in the extreme mechanics research will be presented.