Analysis of multipatch discontinuous Galerkin IgA approximations to elliptic boundary value problems. (English) Zbl 1388.65152
Summary: In this work, we study the approximation properties of multipatch dG-IgA methods, that apply the multipatch Isogeometric Analysis discretization concept and the discontinuous Galerkin technique on the interfaces between the patches, for solving linear diffusion problems with diffusion coefficients that may be discontinuous across the patch interfaces. The computational domain is divided into non-overlapping subdomains, called patches in IgA, where B-splines, or NURBS approximations spaces are constructed. The solution of the problem is approximated in every subdomain without imposing any matching grid conditions and without any continuity requirements for the discrete solution across the interfaces. Numerical fluxes with interior penalty jump terms are applied in order to treat the discontinuities of the discrete solution on the interfaces. We provide a rigorous a priori discretization error analysis for diffusion problems in two- and three-dimensional domains, where solutions patchwise belong
to \(W^{l,p}\), with some \(l\geq 2\) and \(p\in ({2d}/{(d+2(l-1))},2]\). In any case, we show optimal convergence rates of the discretization with respect to the dG-norm.
MSC:
| 65N30 | Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs |
| 65D07 | Numerical computation using splines |
| 65N12 | Stability and convergence of numerical methods for boundary value problems involving PDEs |
| 65N15 | Error bounds for boundary value problems involving PDEs |
Keywords:
linear elliptic problems; discontinuous coefficients; discontinuous Galerkin discretization; isogeometric analysis; non-matching meshes; low regularity solutions; a priori discretization error estimatesReferences:
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