Aerodynamics Model for a Solid Rocket Booster

NASA required an aerodynamics model of a spent solid rocket booster (SRB) to predict trajectory and impact location of the Ares I first stage after separation. The software needed to be integrated into new simulations written in C. Marshall Space Flight Center (MSFC) had previously developed a solid rocket booster re-entry simulation for the Space Transportation System (the Space Shuttle). The simulation was written in Fortran, and the aerodynamics model was embedded in a single function with other parts of the flight dynamics model. It could not be extracted easily for reuse in another simulation.