中科院数学与系统科学研究院

数学研究所

中科院华罗庚数学重点实验室

华罗庚青年数学论坛

综合报告

报告人陈嘉杰 博士Courant Institute, New York University

 Stable nearly self-similar blowup of the 2D Boussinesq and 3D Euler equations with smooth data

  2023.04.07(星期五),09:00-10:00

  点:Zoom会议:842 9288 0953   密码:0407

  要:Whether the 3D incompressible Euler equations can develop a finite-time singularity from smooth initial data is an outstanding open problem. In this talk, we will first review recent progress in singularity formation in incompressible fluids. Then, we will present a result inspired by the Hou-Luo scenario for a potential 3D Euler singularity, in which we prove finite time blowup of the 2D Boussinesq and 3D Euler equations with smooth initial data and boundary. To establish the blowup results, we construct an approximate self-similar blowup profile and prove its nonlinear stability with computer assistance. In the stability analysis, we decompose the linearized operator into the leading order operator and the remainder. We develop sharp functional inequalities using optimal transport and the symmetry properties of the velocity kernels to estimate the nonlocal terms from the velocity and use weighted energy estimates to establish the stability analysis of the leading order operator. The key role of computer assistance is to construct an approximate blowup profile and approximate space-time solutions with rigorous error control, which provides critical small parameters in the energy estimates for the stability analysis and allows us to control the remainder perturbatively. This is joint work with Tom Hou.

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