The program is an older computational fluid dynamics code written by our teacher, where we have a 2D chamber with solid walls on the bottom and sides. The top of the chamber has a moving plate which creates vorticity within the chamber. The calculations are fairly simple, using arrays and finite differencing formulas.
I would most certainly say that the code can be rewritten in Maple, I just hadn't taken the time to rewrite it. Since the code works, I thought it would be easiest and quickest to use the older Fortran code and move the results into Maple where some of the more advanced features, like creating plots, are easier to program.
Update: I have the solution in Matlab so I would say that my problem has been solved. No need for anyone to spend additional time trying to come up with solutions.