Liu, Z. , McBride, A. , Saxena, P. and Steinmann, P. (2019) Solving the Laplace-Beltrami Equation on Curved Two-dimensional Manifolds using the Finite Element Method with Catmull-Clark Subdivision Surfaces. VII International Conference on Isogeometric Analysis, Munich, 18-20 September 2019.
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Abstract
The early works on isogeometric analysis focused on geometries modelled through Non-Uniform Rational B-Splines (NURBS). However, a NURBS sur- face is a tensor product surface generated by two NURBS curves. This has limitations in modelling geometries with complex topologies. Catmull-Clark subdivision surfaces are derived as tensor-products of Catmull-Clark subdivi- sion curves, but allowing ”extraordinary vertices”. This ensure the Catmull- Clark subdivision surfaces can be used for modelling complex geometries with arbitrary topologies. The present work proposes and analyses an isogeometric approach for solving the Laplace-Beltrami equation on a two-dimensional manifold embed- ded in three-dimensional space using the finite element method with Catmull- Clark subdivision surfaces. The Catmull-Clark subdivision bases are used to discretise both the geometry and physical fields. A fitting method is also proposed to generate control meshes to approximate any given geometries with Catmull-Clark subdivision surfaces. Sample points are chosen from the given surface and least square fitting is used to obtain an optimal control mesh for the surface. The Catmull-Clark subdivision method is also com- pared to the conventional finite element method. Subdivision surfaces with no extraordinary vertices have the optimal p + 1 convergence rate. However the extraordinary vertices introduce relatively large errors in the analysis which decreases the convergence rate. A comparative study shows the ef- fects of the number and valences of the extraordinary vertices. An adaptive quadrature scheme and other remedies are also implemented to reduce the error.
| Item Type: | Conference or Workshop Item |
|---|---|
| Status: | Published |
| Refereed: | No |
| Glasgow Author(s) Enlighten ID: | McBride, Professor Andrew and Liu, Dr Zhaowei and Saxena, Dr Prashant and Steinmann, Professor Paul |
| Authors: | Liu, Z., McBride, A., Saxena, P., and Steinmann, P. |
| Subjects: | Q Science > QA Mathematics T Technology > TA Engineering (General). Civil engineering (General) |
| College/School: | College of Science and Engineering > School of Engineering > Infrastructure and Environment |
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