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Generating High Quality Meshes in Gap Regions using Geometrical Information from the Medial Object

Jeremy D Gould

Research Notes, 19th International Meshing Roundtable, Springer-Verlag, pp.Research Note, October 3-6 2010


19th International Meshing Roundtable
Chattanooga, Tennessee, USA.
October 3-6, 2010

Aircraft Research Association Ltd, Manton Lane, Bedford, England MK41 7PF.

One of the major issues affecting advancing layer hybrid mesh generation for CFD applications is the relatively poor quality of the mesh between nearby components. This article describes recent work in which the medial object [1] has been exploited to provide geometrical and topological information in a novel approach to hybrid mesh generation for complex configurations. The idea behind the new technique is to generate a semi-structured local mesh in a region between nearby components of a model guided by the medial object. The SOLAR [2] mesh generator (jointly developed by BAE SYSTEMS, Airbus and ARA) is then used to produce a conformal volume mesh for the flow domain which incorporates the local mesh. The advancing-layer method of mesh generation used in the SOLAR mesh generator to mesh the near-field is capable of producing high quality meshes for viscous flow solutions. However, the technique has the disadvantage, compared to structured meshing, in that it operates with only limited knowledge of the domain topology. The method builds a volume mesh from a surface mesh of the boundary of the flow domain by growing layers away from the boundary surface mesh, without regard for other regions of the boundary. In the absence of any knowledge of nearby boundary components, separate regions of the mesh may grow into each other. For example, this occurs in high-lift geometries where the layer mesh growing from the leading edge of a wing can intersect that growing from the trailing edge of a slat. This is avoided in SOLAR by using local pull back of the layer mesh which restricts how far the mesh can grow. This may lead to a deterioration of mesh quality, and robustness issues resulting from the need to interface an anisotropic near-field mesh with a tetrahedral far-field mesh which is isotropic. On the other hand, structured meshing algorithms, such as transfinite interpolation, are based on a full knowledge of the boundaries of the domain, and therefore have the potential to be able to provide a much better mesh quality in narrow regions between components. The meshing technique described in this note exploits the advantages of both approaches by extracting information about the domain topology from the medial object.

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