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Date & Time: Thu, 20 February 2020, 11:30 to
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Start
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The Faraday instability: Floquet analysis, numerical simulation, and exotic patterns
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History -- Experiments
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Hydrodynamic Instabilities
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History -- Theory & Numerics
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Benjamin & Ursell inviscid linear stability analysis Linear problem is homogeneous in x,y,
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Linear stability problem reduces to:
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Result of viscous stability analysis
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Exotic Patterns
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Two-frequency forcing
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Back to single-frequency forcing
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Equations and numerical methods
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Compare numerical simulation with Floquet analysis Nicolas Perinet
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Hexagonal lattice
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Computations carried out in minimal hexagonal domain: smallest rectangular domain that can accommodate hexagons
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Velocity field at various instants
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Hexagonal pattern over one subharmonic oscillation period
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Long-time evolution
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Stroboscopic films show long-time behavior
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Fourier spectra
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Fourier spectra : time evolution
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Questions: Is this time-dependent behavior in the minimal domain related to the competition between squares and hexagons in a large domain?
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High Performance Computing with BLUE
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Faraday Super-squares
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Experimental study of the Faraday instability
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What about a spherical interface subjected to a radical force?
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Planar and Spherical
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Numerical Floquet analysis
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Full nonlinear simulations using BLUE
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Predictions from symmetry theory Busse, Golubitsky, Chossat, Matthews, ...
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Formulas when patterns are aligned along axis asymmetric
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l= 3 tetrahedron
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Impossible for pure capillary waves
Description:
Explore the fascinating world of Faraday waves in this comprehensive lecture by Laurette Tuckerman from Sorbonne University. Delve into the history, theory, and numerical simulations of the Faraday instability, where standing waves appear on the free surface of a vertically vibrated fluid layer. Discover exotic patterns such as quasipatterns, superlattices, and quasi-hexagons alternating with beaded stripes. Learn about the Benjamin & Ursell inviscid linear stability analysis, viscous stability analysis, and full nonlinear simulations using high-performance computing. Examine the long-time evolution of hexagonal patterns, Fourier spectra, and the intriguing behavior of Faraday super-squares. Investigate the application of these concepts to spherical interfaces and explore predictions from symmetry theory. Gain insights into cutting-edge research on hydrodynamic instabilities and pattern formation in fluid dynamics.

Exotic Patterns in Faraday Waves

International Centre for Theoretical Sciences
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