The main topic of this thesis is the solution at engineering problem of minimum drag axisymmetric vehicles design. Drag reduction is only possible through manipulation of the vehicle shape, in order to delay viscous layer separation point. An a fusolage body will be invested at zeros angle by a costant speed flow. In the fi rst chapters is proposed the study of the physic problem, with an analysis of minimum drag bodies at difference Reynolds numbers, the boundary layer's evolution across body's length and it separation. Later is proposed CFD analysis whith Gamma-Retheta transiction model using STAR-CCM+ and a subsequent optimization of the body's shape thanks to HEEDS software.