Dispersive wave behavior in first-order hyperbolic systems

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• David Ketcheson (King Abdullah University of Science and Technology (KAUST))
• Wednesday 28 September 2022, 15:30-16:30
• Seminar Room 2, Newton Institute.

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HYD2 - Dispersive hydrodynamics: mathematics, simulation and experiments, with applications in nonlinear waves

First-order hyperbolic PDEs are generally conceived as the vanishing-viscosity limit of a dissipative system; their solutions generically exhibit shock singularities and entropy decay.  In contrast, dispersive wave equations often exhibit solitary waves and dispersive shock waves.  Strikingly, first-order systems with periodically-varying coefficients can exhibit solitary wave formation as well as shock formation.  I will review what is known about such systems, including our understanding of the effective dispersive mechanisms and criteria for dispersive- or shock-like behavior of solutions.  I will show examples of solitary wave formation and shock suppression in applications including elasticity, non-dispersive water wave models, and compressible gas dynamics.  We will see that, in an appropriate regime, these systems seem to behave like near-integrable dispersive wave models.  Many interesting questions about them remain to be explored.

This talk is part of the Isaac Newton Institute Seminar Series series.

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