中科院数学与系统科学研究院

数学研究所

调和分析及其应用中心

 

学术报告会

 

报告人:Prof. Zhang Ting Zhejiang University

 目:Dispersive effects of the incompressible and compressible fluids

 间:2017.07.26(星期三),14:30-15:30

 点:晨兴410

要:In this talk, we consider the Cauchy problem of the $N$-dimensional incompressible viscoelastic fluids with $N\ge2$. It is shown that, in the low frequency part, this system possesses some dispersive properties derived from the one parameter group $e^{\pm it\Lambda}$. Based on this dispersive effect, we construct global solutions with large initial velocity concentrating on the low frequency part. Such kind of solution has never been seen before in the literature even for the classical incompressible Navier-Stokes equations. The proof relies heavily on the dispersive estimates for the system of acoustics, and a careful study of the nonlinear terms. And we also obtain the similar result for the isentropic compressible Navier-Stokes equations. Here, the initial velocity with arbitrary $\dot{B}^{\fr{N}{2}-1}_{2,1}$ norm of potential part $\Pe^\bot u_0$ and large highly oscillating are allowed in our results. (Joint works with Daoyuan Fang and Ruizhao Zi)

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