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  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  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
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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