Solving the triharmonic equation over multi-patch domains using isogeometric analysis
This work provides a method for solving higher-order PDEs on multi-patch domains, which is relevant for isogeometric analysis practitioners, but the results are preliminary and lack quantitative comparison.
The paper presents a framework for solving the triharmonic equation over multi-patch domains using isogeometric analysis, constructing a globally C^2-smooth spline space with local, well-conditioned basis functions. Numerical examples demonstrate the approach's potential, but no concrete performance numbers are provided.
We present a framework for solving the triharmonic equation over bilinearly parameterized planar multi-patch domains by means of isogeometric analysis. Our approach is based on the construction of a globally $C^2$-smooth isogeometric spline space which is used as discretization space. The generated $C^2$-smooth space consists of three different types of isogeometric functions called patch, edge and vertex functions. All functions are entirely local with a small support, and numerical examples indicate that they are well-conditioned. The construction of the functions is simple and works uniformly for all multi-patch configurations. While the patch and edge functions are given by a closed form representation, the vertex functions are obtained by computing the null space of a small system of linear equations. Several examples demonstrate the potential of our approach for solving the triharmonic equation.