Plenary Lectures

Plenary Lectures

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Plenary Lectures

Opening lecture

Distinguished Prof. Yoon Young Kim
  • Distinguished Prof. Yoon Young Kim
  • Seoul National University (Korea)
  • Exotic anisotropic metamaterials for novel manipulation of elastic waves
  • AbstractBiography

    Elastic waves are critically used for non-destructive evaluations in industrial and medical fields. Because the wave field is multimodal, involving coupled longitudinal and transverse wave modes, manipulating elastic waves for specific new applications is very challenging. Here, we show that elastic waves can be manipulated unprecedentedly if engineered materials of exotic anisotropy, not found in natural materials, are elaborately used. We present the principle to “design” exotic anisotropy for wave manipulation, actual fabrication through single-phase metamaterials, and their unique applications.

    B.S. (1981) and M.S. (1983), Seoul National University. Ph.D. (1989), Stanford University
    Assistant to Distinguished Professor (1991~), Seoul National University
    President (2016), Korean Society of Mechanical Engineers
    President (2018-2020), Asian Society of Struct. Multi. Optimization
    Vice-President (2015~2019), Int. Society of Struct. Multi. Optimization
    Co-Chair (2016), 12th World Congress on Computational Mechanics
    Fellow/Member (2019~), Korean Academy of Science and Technology and Engineering & National Academy of Engineering, Korea
    ASME (American Society of Mechanical Engineers) Rayleigh Lecture Award (2023)
    JSCES (Japan Society for Computational Engineering and Science) Grand Prize (2022)
    National Medal of Honor in Science and Technology (2021)
    The Mechanical Engineer of the Year (2019)

Closing lecture

Dr. Bérengère Dubrulle
  • Dr. Bérengère Dubrulle
  • CNRS (France)
  • Turbulence at the Kolmogorov scale
  • AbstractBiography

    If you stir strongly enough a viscous flow, it becomes turbulent and displays vortices and coherent structures of various sizes. The typical scale for energy dissipation is called the Kolmogorov scale η and marks the transition between the power law behavior and a steep exponential decay in the wavenumber range. Therefore, scales smaller than η contains a negligible fraction of the kinetic energy. Because of that, it is often thought that scales below η are irrelevant and that “nothing interesting is happening below η”. For a long time, it was for example thought that a direct numerical simulation of a viscous fluid is “well resolved” if its minimal grid spacing is η. Recent theoretical and experimental progresses however suggest that many interesting phenomena do happen below η and may influence the dynamics of industrial, geophysical or astrophysical fluids. This talk discusses some of these phenomena using both numerical simulations and a dedicated large turbulent experiment.

    Bérengère Dubrulle is a senior scientist at the Centre National de la Recherche Scientifique and presently Director of the Les Houches Physics School and Editor of JFM Perspectives. She received her PhD in astrophysics in 1990 under the supervision of J-P. Zahn. She is a specialist of turbulence, and its application to astro and geophysical flows using theoretical, numerical or experimental approaches. Her major achievements are about theory of the solar system formation, statistical modelling of large scales and their bifurcations, or mathematical aspects of the small-scale structure, in connection with singularities and intermittency. She was involved in the VKS dynamo experiment and in the SHREK superfluid (quantum) turbulence experiment. She received the CNRS bronze and Silver Medal, the Victor Noury Prize of the French Academy of Sciences, and the Lewis Fry Richardson medal of the European Geophysical Union.

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