摘要:

This talk is about the large Reynold number limits and asymptotic behaviors of solutions to the 2D steady Navier-Stokes equations in an infinitely long convergent channel. We will show that for a general convergent infinitely long nozzle whose boundary curves satisfy curvature-decreasing and any given finite negative mass flux, the Prandtl's viscous boundary layer theory holds in the sense that there exists a Navier-Stokes flow with no-slip boundary condition for small viscosity, which is approximated uniformly by the superposition of an Euler flow and a Prandtl flow. Moreover, the asymptotic behaviors of the solution to the Navier-Stokes equations near the vertex of the nozzle and at infinity are determined by the given flux, which is also important for the constructions of the Prandtl approximation solution due to the possible singularities at the vertex and non-compactness of the nozzle. One of the key ingredients in our analysis is that the curvature-decreasing condition on boundary curves of the convergent nozzle ensures that the limiting inviscid flow is pressure favorable and plays crucial roles in both the Prandtl expansion and the stability analysis. It is joint work with Prof. Zhouping Xin.

报告人简介：

高宸，2020年博士毕业于中科院数学所，2020-2022年在北京大学从事博士后研究，现为香港中文大学数学研究所Research Associate，主要从事不可压缩流体方程组的研究，特别是稳态Navier-Srokes方程的边界层理论。

报告时间和地点：2023年9月18日（周一）， 上午9:00--11:00

腾讯会议：495947734

联系人：陶涛 邮箱：taotao@sdu.edu.cn