This project represents the final thesis of the Bachelor’s Degree in Aerospace Technologies Engineering. In this thesis the development of a simulation code for H-Type Vertical Axis Wind Turbines based on the Double Multiple Streamtube Model is presented. The aim of the project, aside from the coding of the program itself, is to apply knowledge gained during the degree to an area of expertise which was not explored in class, as well as learning more about it. Another objective is to develop the programming abilities in Python, a language which is not taught in any course and is important in engineering applications. Regarding the study itself, first a general overview on wind energy is developed: a few concepts related to this field and important to the development of the project are introduced, and then the state of the art in the wind turbine field is presented. Then the code is developed: both formulation and its implementation in the code are detailed. Once the raw model has been implemented, a convergence study is carried out as the preliminary validation, and then several corrections are added in order to account for specific phenomena which are not initially taken into consideration. Next, conclusions about their effect on the results are extracted. When the code is closed, it is applied to the calculation of instantaneous torque generated by a rotor, and the effect of the number of blades in its variability is quantified. Finally the results of an experimental campaign are compared with those obtained with the simulation code. Some discrepancy is found between the program’s results and experimental measurements, and possible reasons for it are given at the end of the project. However, the code has proven useful to perform analyses during the early stages of a turbine’s design, mainly due to its low computational requirements and the ability to capture the effects of design features on the rotor’s performance.