Tommie is a parallel grid generator written in C++ and MPI that allows generation of highly controlled meshes in extremely complex geometries.  The mesh construction is highly automated, and requires a minimal set of input parameters.  Geometries are imported as STL (stereo-lithography) surfaces, a standard neutral format available in almost every CAD system.  Grid resolution at each STL surface is specified by indicating a normal and tangential length scale.  Additional constraints on the grid-size can be introduced anywhere in the domain.  The resulting grid is guaranteed to satisfy the requested resolution automatically.  Tommie meshes provide a stairstep representation of the boundaries (non-body-fitted meshes) but a prototype algorithm to perform grid projection and to generate boundary-layer-type resolution is also available.

Tommie exports meshes that are compatible with our in-house solver CharLES and commercial CFD codes (ANSYS msh format). Above, an example of Tommie mesh projected on a true surface of Formula 1 car is shown.

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