High order unfitted finite element methods on level set domains using isoparametric mappings

High order unfitted finite element methods on level set domains using isoparametric mappings

We introduce a new class of unfitted finite element methods with high order accurate numerical integration over curved surfaces and volumes which are only implicitly defined by level set functions. An unfitted finite element method which is suitable for the case of piecewise planar interfaces is combined with a parametric mapping of the underlying mesh resulting in an isoparametric unfitted fin...

Numerical Integration over Implicitly Defined Domains for Higher Order Unfitted Finite Element Methods

The paper studies several approaches to numerical integration over a domain defined implicitly by an indicator function such as the level set function. The integration methods are based on subdivision, moment–fitting, local quasi-parametrization and Monte-Carlo techniques. As an application of these techniques, the paper addresses numerical solution of elliptic PDEs posed on domains and manifol...

High Order Unfitted Finite Element Methods for Interface Problems and PDEs on Surfaces

Finite Element-Based Level Set Methods for Higher Order Flows

In this paper we shall discuss the numerical simulation of higher order geometric flows by level set methods. Main examples under considerations are surface diffusion and the Willmore flow as well as variants and of them with more complicated surface energies. Such problems find various applications, e.g. in materials science (crystal growth, thin film technology), biophysics (membrane shapes),...

A study on unfitted 1D finite element methods

In the present paper we consider a 1D Poisson model characterized by the presence of an interface, where a transmission condition arises due to jumps of the coefficients. We aim at studying finite element methods with meshes not fitting such an interface. It is well known that when the mesh does not fit the material discontinuities the resulting scheme provides in general lower order accurate s...