Academy of Mathematics and Systems Science, CAS
Colloquia & Seminars

Speaker:	Dr. Chenyun Luo，Vanderbilt University, USA
Inviter:
Title:	Free-boundary compressible Euler equations and the incompressible limit
Time & Venue:	2019.1.4 16:00-17:00 S915
Abstract:	We present a new type of energy estimates for the compressible Euler equations with free boundary, with a boundary part and an interior part. These can be thought of as a generalization of the energies in Christodoulou and Lindblad to the compressible case and do not require the fluid to be irrotational. Furthermore, the estimate is uniform as the sound speed of the liquid goes to infinity, which allows us to show the convergence of the solution for compressible Euler equations to that of the incompressible equations in C2. In particular, we can approximate the solution of a compressible gravity water wave by that of an incompressible water wave, whose global in time solution is known to exist. This work opens up a new approach to proving long time existence also for compressible water waves with small data, as conjectured by Hans Lindblad.