Local well-posedness of the capillary-gravity water waves with acute contact angles

TL;DR

This paper extends the analysis of capillary-gravity water waves with contact angles up to /2, overcoming significant singularities to establish local well-posedness for a broader range of contact angles.

Contribution

It introduces new techniques to handle elliptic singularities for larger contact angles, proving local well-posedness in a geometric framework.

Findings

Established local well-posedness for contact angles in (0, /2)

Developed a priori energy estimates for the problem

Handled complex elliptic singularities affecting regularity

Abstract

We consider the two-dimensional capillary-gravity water waves problem where the free surface $\Gamma_t$ intersects the bottom $\Gamma_b$ at two contact points. In our previous works \cite{MW2, MW3}, the local well-posedness for this problem has been proved with the contact angles less than $\pi/16$. In this paper, we study the case where the contact angles belong to $(0, \pi/2)$. It involves much worse singularities generated from corresponding elliptic systems, which have a strong influence on the regularities for the free surface and the velocity field. Combining the theory of singularity decompositions for elliptic problems with the structure of the water waves system, we obtain a priori energy estimates. Based on these estimates, we also prove the local well-posedness of the solutions in a geometric formulation.