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Automatic decomposition of complex thin walled CAD models for hexahedral dominant meshing

Sun, Liang, Christopher M Tierney, Cecil G Armstrong, Trevor T Robinson

Proceedings, 25th International Meshing Roundtable, Elsevier, Science Direct, September 26-30 2016

INTERNATIONAL
MESHING
ROUNTABLE

25th International Meshing Roundtable
Washington DC, U.S.A.
September 26-30, 2016

Liang Sun, Queen's University Belfast, GB, lsun02@qub.ac.uk
Christopher M Tierney, Queen's University Belfast, GB, christopher.tierney@qub.ac.uk
Cecil G Armstrong, Queen's University Belfast, GB, c.armstrong@qub.ac.uk
Trevor T Robinson, Queen's University Belfast, GB, t.robinson@qub.ac.uk

Abstract
This paper describes an automatic method for identifying thin-sheet regions (regions with large lateral dimensions relative to the thickness) for complex thin walled components, with a view to using this information to guide the hex meshing process. This fully automated method has been implemented in a commercial CAD system (Siemens NX) and is based on the interrogation and manipulation of face pairs, which are sets of opposing faces bounding thin-sheet regions. Careful consideration is given to the mapping, merging and intersection of face pairs to generate topologies suitable for sweep meshing thin-sheet regions, and for treating the junctions between adjacent thin-sheet regions. The quality of the resulting hexahedral mesh is considered when making decisions on the generation and positioning of the cutting surfaces required to isolate thin-sheet regions. The resulting decomposition delivers a substantial step towards automatic hexahedral meshing for complex thin-walled geometries. It is proposed that hexahedral meshes be applied to the identified thin-sheet regions by quad meshing one of the faces bounding the thin-sheet region and sweeping it through the thickness to create hexahedral elements.

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