The study of fluid mechanics goes back at least to the days of ancient Greece, when Archimedes made a beginning on fluid statics. However, fluid mechanics, especially fluid dynamics, is an active field of research with many unsolved or partly solved problems. Fluid mechanics can be mathematically complex. Sometimes it can best be solved by numerical analysis, typically using computers. A modern discipline, called "Computational Fluid Dynamics" (CFD), is devoted to this approach to solving fluid mechanics problems.