A DISTORTION TO VALIDATE AND GENERATE CURVED MESHES ON CAD SURFACES
| Autor: | Gargallo Peiró, Abel, Roca Navarro, Francisco Javier, Peraire Guitart, Jaume, Sarrate Ramos, Josep |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. LACÀN - Mètodes Numèrics en Ciències Aplicades i Enginyeria, Barcelona Supercomputing Center |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
curved elements
mesh optimization Models geomètrics Matemàtiques i estadística::Anàlisi numèrica::Mètodes numèrics [Àrees temàtiques de la UPC] high-order methods Enginyeria electrònica [Àrees temàtiques de la UPC] Elements finits Mètode dels parameterized surfaces Geometric analysis Numerical grid generation (Numerical analysis) CAD quality measure high-order mesh generation |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) International Journal for Numerical Methods in Engineering |
| Popis: | A framework to validate and generate curved nodal high-order meshes on Computer-Aided Design (CAD) surfaces is presented. The proposed framework is of major interest to generate meshes suitable for thin-shell and 3D finite element analysis with unstructured high-order methods. First, we define a distortion (quality) measure for high-order meshes on parameterized surfaces that we prove to be independent of the surface parameterization. Second, we derive a smoothing and untangling procedure based on the minimization of a regularization of the proposed distortion measure. The minimization is performed in terms of the parametric coordinates of the nodes to enforce that the nodes slide on the surfaces. Moreover, the proposed algorithm repairs invalid curved meshes (untangling), deals with arbitrary polynomial degrees (high-order), and handles with low-quality CAD parameterizations (independence of parameterization). Third, we use the optimization procedure to generate curved nodal high-order surface meshes by means of an a posteriori approach. Given a linear mesh, we increase the polynomial degree of the elements, curve them to match the geometry, and optimize the location of the nodes to ensure mesh validity. Finally, we present several examples to demonstrate the features of the optimization procedure, and to illustrate the surface mesh generation process The first author was sponsored by CUR from DIUE of the Generalitat de Catalunya and the European Social Fund (grants FI-DGR’11 and BE-DGR’12), and by the Ferran Sunyer i Balaguer Foundation (grant FSB’13). The work of the corresponding author was partially supported by the Boeing Co. & US Air Force Office of Scientific Research & European Commission through the Boeing-MIT Alliance & the Computational Math Program & Marie Skłodowska-Curie Actions (HiPerMeGaFlowS individual fellowship grant). |
| Databáze: | OpenAIRE |
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