Description of a Hyperbolic Grid Generating Procedure for Arbitrary Two-Dimensional Bodies

This report describes the procedures used to create 0 and C-type solution grids around arbitrary two-dimensional bodies. The grid generation procedure is a modification of the 0-type hyperbolic method of Steger and Chaussee. The procedure described in Reference (1) was modified by including additional dissipation terms and by changing the form of the dissipation described. The modifications necessary to produce a C-type grid are discussed and examples are provided. A brief description of the theory and development of the governing hyperbolic equations is provided. Example results for both an airfoil section and a complex body (X-24C) are shown. A discussion of the user definable input variables and their effects on the resulting grid is included. For many solution procedures it is desirable that the distribution of points around the airfoil be 'second order smooth.' Since most airfoils are defined with a somewhat random distribution of points, a routine was used to redefine the coordinates in a smooth distribution. The routine also allows selective clustering of grid points in regions of interest. A brief description of this routine and the effects of the different input parameters are included as Appendix A.