Both a Matlab version and a NDP Fortran version of the grid generation program were developed based on Brackbill's theory. In the Fortran version, NDP Fortran Graphic Libraries were used to make a Fortan based GUI. The Matlab GUI was used to develop the Matlab version of the grid generation program. The Matlab version is available to be downloaded from this page. I would appreciate it if you could send me your comments. To download the NDP Fortran version, please contact Fengyan Shi.