Development and implementation of Gridgen's hyperbolic PDE and extrusion methods
John P. Steinbrenner, Nick Wyman, John R. Chawner · 38th Aerospace Sciences Meeting and Exhibit · 2000
Hyperbolic partial differential equation grid generation methods were implemented in the Gridgen software system. The development and implementation of these methods resulted in two unique attributes: the ability to use a hyperbolic method to generate a structured surface grid spanning multiple trimmed B-Spline surfaces, and special boundary condition treatments that allow multiblock abutting grids to be generated. Also, the hyperbolic method’s implementation served as the basis for the implementation of normal, translation, rotation, and path-based algebraic extrusion methods. Finally, the algebraic extrusion methods were generalized to create layers of prism cells by extruding triangles. Despite the differences between surface constrained quadrilateral grids, multi-block volume grids, and prismatic unstructured grids, all were implemented in a unified manner within Gridgen.