Convergence of adaptive discontinuous Galerkin and $C^0$-interior penalty finite element methods for Hamilton--Jacobi--Bellman and Isaacs equations

TL;DR

This paper proves the convergence of adaptive discontinuous Galerkin and $C^0$-interior penalty finite element methods for solving fully nonlinear second-order elliptic Hamilton--Jacobi--Bellman and Isaacs equations, with a focus on a broad family of methods on adaptively refined meshes.

Contribution

It introduces a novel intrinsic characterization of the limit space, enabling convergence analysis of nonconforming finite element methods for complex nonlinear PDEs.

Findings

Proved convergence of adaptive methods for nonlinear PDEs.

Developed a detailed theory for the limit space and auxiliary function spaces.

Established approximation and weak convergence results for finite element functions.

Abstract

We prove the convergence of adaptive discontinuous Galerkin and $C^0$-interior penalty methods for fully nonlinear second-order elliptic Hamilton--Jacobi--Bellman and Isaacs equations with Cordes coefficients. We consider a broad family of methods on adaptively refined conforming simplicial meshes in two and three space dimensions, with fixed but arbitrary polynomial degrees greater than or equal to two. A key ingredient of our approach is a novel intrinsic characterization of the limit space that enables us to identify the weak limits of bounded sequences of nonconforming finite element functions. We provide a detailed theory for the limit space, and also some original auxiliary functions spaces, that is of independent interest to adaptive nonconforming methods for more general problems, including Poincar\'e and trace inequalities, a proof of density of functions with nonvanishing jumps on only finitely many faces of the limit skeleton, approximation results by finite element functions and weak convergence results.