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Nonlinear Analysis

The Interplay between Analysis and Computation in Studying 3D Euler Singularity

Thomas Yizhao Hou, California Institute of Technology

Location:  Zoom
Date & time: Tuesday, 27 April 2021 at 1:40PM - 2:40PM

Abstract: Whether the 3D incompressible Euler equations can develop a singularity in finite time from smooth initial data is one of the most challenging problems in mathematical fluid dynamics. We first review the numerical evidence of finite time singularity for 3D axisymmetric Euler equations by Luo and Hou. The singularity is a ring like singularity that occurs at a stagnation point in the symmetry plane located at the boundary of the cylinder. We then present a novel method of analysis and prove that the 1D HL model and the original De Gregorio model develop finite time self-similar singularity. This analysis has been generalized to prove finite time singularity of the 2D Boussinesq and 3D Euler equations with C^{1,alpha} initial velocity and boundary, whose solutions share some essential features similar to those reported in the Luo-Hou computation. Finally, we present some recent numerical results on singularity formation of the 3D axisymmetric Navier-Stokes equations with degenerate diffusion coefficients.

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