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The ability to predict the distance required for an aircraft to takeoff is an essential component of aircraft design. It involves aspects related to each of the major aircraft systems: aerodynamics, propulsion, configuration, structures, and stability and control.For an aircraft designed for short takeoffs and landings (STOL), designing the aircraft to provide a short takeoff distance, or more precisely the balanced field length (BFL), often leads to the use of a powered lift technique such as circulation control (CC). Although CC has been around for many years, it has never been used on a production aircraft. This is in part due to the lack of knowledge as to how well CC can actually perform as a high lift device. This research provides a solution to this problem. By utilizing high fidelity computational fluid dynamics (CFD) aerodynamic data, a four-dimensional design space which was populated and modeled using a Monte Carlo approach, and a Gaussian Processes regression technique, an effective aerodynamic model for CC was produced which was then used in a BFL simulation. Three separate models were created of increasing quality which were then used in the BFL performance calculations. A comprehensive gridding methodology was provided as well as computational and grid dependence error analysis. Specific consideration was given to the effect of resolving the turbulent boundary layer in both the gridding and solving processes. Finally, additional turbulence model validation work was performed, both to match previously performed experimental data and to provide a comparison of different models' abilities to predict separation.v AcknowledgmentsThere are a number of people which need to be mentioned for their support throughout my time spent here at Cal Poly. First, I want to thank my wife Amanda who has spent countless nights waiting for me to finish my work and often fell asleep in the process because I took too long. I want to apologize to my daughter Lillian for the many hours which I spent sitting at a computer instead of helping her litter toys around the apartment. I want to say thanks to my parents Mark and Darlene for supporting me in my five years at Cal Poly as well as the Navy and the Department of Naval Research for supporting me over the first summer of research on CCW. I would also like to say thanks to the rest of my family who continually asked me "so what are you doing?" and "so when will you be finished." It's finished now.I would like to thank Dr. Marshall for the years of guidance and direction which he provided on this project. Thanks to Scott Turner for his companionship in a building without windows for an entire summer. This project would have been much different without him and the GPs. I am grateful for the other two guys who spent their days in the ATL along with Scott and me: Brian Saponas and Robert Perry. Many hours of gridding, coding, solving, and analysis was performed alongside these people and everyone was always willing to help out.Thanks to Cal Poly for the 26 computers and the 90...