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Grošelj, Jan; Knez, Marjeta
Computer methods in applied mechanics and engineering, 05/2022, Letnik: 395Journal Article
The paper generalizes the classical C1 cubic Clough–Tocher spline space over a triangulation to C1 spaces of any degree higher that three. It shows that the considered spaces can be equipped with a basis consisting of non-negative locally supported functions forming a partition of unity and demonstrates the applicability of the basis in the context of the finite element method. The studied spaces have optimal approximation power and are defined by enforcing additional smoothness inside the triangles of the triangulation where the Clough–Tocher splitting is used. Locally, over each triangle of the triangulation, the splines are expressed in the Bernstein–Bézier form, which enables one to take the full advantage of the geometric properties and computational techniques that come with such a representation. Solving boundary problems with Galerkin discretization is thus relatively straightforward and is illustrated with several examples.
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