Wind turbines operating on a hilly terrain may produce more power because of the speed-up effect,in comparison to flat terrain.The main aim of this thesis is to investigate the properties of wind flow over proposed hill-like constructions and optimize the shape of idealized artificial hills,which may be used as storage buildings or rooftops with a goal to accelerate the incoming wind flow.The first part of the project gives an overview of the flow field over hills and demonstrates the proposed concept of hill-like structures integrated into wind turbines as independent buildings or rooftops with building-mounted wind turbines.Later on,numerous CFD simulations have been carried out to study the phenomena of speed-up effect over idealized hills and to optimize their shape by means of changing the hill slope or extending the top part of models.Afterward,the results of two and three-dimensional CFD simulations were validated and analyzed,which gave the ability to obtain the most optimal shape from the studied models.The last part of this research is a more realistic example of using this conceptual rooftop shape in the urban area to improve the performance of wind turbines operating in places with comparatively low wind speeds.The increase in power output can be seen from the results and overview of the received power curves.