Splitflow: A 3D unstructured cartesian/ prismatic grid CFD code for complex geometries

A computational fluid dynamics (CFD) code, named SPLITFLOW, is described which makes use of a hybrid grid system to discretize complex 3D geometries. The primary grid system is an unstructured Cartesian grid, automatically generated by the code using recursive cell subdivision. This grid system is sufficient for computing Euler solutions about extremely complex 3D geometries. A secondary grid system, using triangular-prismatic elements, may be added for resolving the boundary layer region near surfaces of solid bodies for Navier-Stokes analyses. A description of the methods used to generate the grids and solve the governing equations is provided. Several example cases are provided, demonstrating the ability of the method to produce accurate solutions about complex geometries with very little pre-processing required by the user.