Efficient Symmetry-Based Decomposition for Meshing Quasi-Axisymmetric Assemblies

Christopher Tierney, Flavien Boussuge, Trevor Robinson, Declan Nolan, Cecil Armstrong

Research output: Contribution to conferencePaperpeer-review


Significant advances in computational hardware and finite-element analysis (FEA) tools have seen a dramatic increase in the models and physics to be analyzed. However, resources are still stretched to their limits when dealing with large models (i.e. whole-engine aero model) and more advanced analyses (i.e. non-linear fan blade-off analyses). To this end, symmetry properties of components, which include geometry, loading, boundary conditions and material properties, are often exploited to reduce simulation run-time by reducing the numbers of degrees of freedom (DOF) in the idealized analysis model. Whilst symmetry idealization is a well-established pre-processing tool for analysis model generation it has not been exploited to simplify mesh generation. Mesh generation can often be a major bottleneck in analysis processes, especially for the creation of hexahedral (hex) meshes. In the absence of automatic hex meshing algorithms the ability to identify symmetry properties enables the partitioning of a complex model into simpler, repeatable sub-domains. This reduces the manual meshing burden required to generate hex meshes as only a portion of the model needs to be meshed and the full mesh can be generated by applying the symmetry operators used to partition the model. Another level of meshing complexity is introduced when dealing with assembly models where there is a requirement to have conformal meshes between adjacent components. Therefore, assembly configurations require any symmetry-based component decompositions to be compatible between adjacent components.
In this paper the aim is to use symmetry properties of components with assembly interface information to decompose quasi-axisymmetric assembly models into symmetric sub-regions and asymmetric residuals. The symmetry-based decomposition an equivalent meshable representation which can be utilized for hex mesh generation using multi-sweeping.
Original languageEnglish
Publication statusPublished - Jul 2018
EventInternational CAD Conference - Paris, France
Duration: 09 Jul 201811 Oct 2018


ConferenceInternational CAD Conference
Abbreviated titleCAD'18


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