Display Abstract

Title Well-posedness for the Navier-slip thin-film equation in complete wetting

Name Lorenzo Giacomelli
Country Italy
Email lorenzo.giacomelli@sbai.uniroma1.it
Submit Time 2014-02-27 15:45:55
Special Session 2: Nonlinear evolution PDEs and interfaces in applied sciences
We are interested in the thin-film equation with quadratic mobility, modeling the spreading of a thin liquid film with a Navier-slip condition at the solid substrate. This degenerate fourth-order parabolic equation has the contact line (where liquid, solid, and vapor meet) as a free boundary. There, a zero-contact angle condition is imposed, modeling the so-called ``complete wetting'' regime. We first argue that the self-similar source-type solution, once its leading order profile is factored-off, is analytic as a function of two variables $(x,x^\beta)$ with $\beta$ irrational, where $x$ denotes the distance from the contact line. Motivated by this preliminary, we then argue that the full free-boundary problem is well-posed in weighted $L^2$-spaces which capture the leading order terms of such $(x,x^\beta)$-expansion. This is part of a joint project with Manuel V. Gnann, Hans Kn\"upfer, and Felix Otto.