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On Vacuum Dynamics and the Entropy

Speaker

Zhouping Xin, The Chinese University of Hong Kong

Time

2019.04.19 16:00-17:00

Venue

Room 306, No.5 Science Building

Abstract

The dynamics of the vacuum state is one of the challenging issues for the viscous compressible fluids. Due the strong degeneracy of the compressible Navier-Stokes system in the presence of vacuum, there are many difficulties associated with global well-posedness of either strong or even weak solutions. This is particularly so for the past efforts have been concentrated on solutions with vacuum without entropy consideration. However, entropy is one of the most important physical states and its equation is highly singular in the presence of vacuum. In this talk, I will discuss some of key issues in studying the full Navier-Stokes system and present some recent results on entropy-bounded strong solutions.