This work presents selected results of an unconventional aircraft development campaign. Engine installation at the rear part of the fuselage imposed design constraints for air intakes that should be used for cooling purposes. Trial and error flight tests increased the development cost and time which required a more sophisticated analysis through computational fluid dynamics (CFD) techniques and robust semiempirical approach. The carried-out investigation of the air intakes started with an empirical approach from guidelines for designing NACA and scoops. Numerical studies via computational fluid dynamics were performed with the air intakes installed in the aircraft fuselage. An analysis based on the air intake efficiency, drag and the effect of angle of attack are detailed in this work. Different air intakes designs, such as scoops of different shapes, were evaluated seeking for improved air intake efficiency and low drag while providing enough air for cooling the engine compartment. The results showed that the numerical approach used herein decreased the development cost and time of the aircraft, providing a reasonable low-cost approach and leading to a design selection more easily. Based on the current approach the canard airplane geometry was changed to account for the new selected air intake for engine cooling purposes.

The recent tendencies of drastic variations of environmental conditions, inundations, severe winds, and gusts besides heavy and unexpected long-duration rains showed the world an image of what could happen if emissions and global warming are not adequately controlled. Implementing new energy solutions as fast as possible is essential to cope with climate change, one of the biggest threats to our survival. These alarming signs intensified research and development efforts to replace fossil-based activities with renewable, eco-friendly energy resources to ensure reduced emissions and global warming effects. Wind energy stands out as one of the favorable renewable energy sources for decarbonization and energy transition of buildings and urban areas. The installation of small and medium-sized windmills in urban areas and on roofs of buildings attends the recommendations for sustainable energy transition, and the UN Sustainable Development Goals, SDG 7, which ensures equity and justice to affordable and reliable clean energy. Installation of windmills of small and medium capacities in urban areas and buildings roofs faces significant challenges, including noise, mechanical vibration, efficiency, and mechanical security necessary for healthy ambient and social acceptance by the population. This review provides a general evaluation of the design and performance of moderate capacity horizontal and vertical axis wind turbines, geometry optimization, current installations on rooftops of buildings and urban districts, studies on horizontal axis and vertical axis wind turbines for rooftops of buildings and metropolitan areas, vibration, noise, and aerodynamic induced mechanical forces, end of life of wind turbine and blades waste recycling and reusing methods. Finally, the review provides conclusions based on the findings from the review and future research and development prospects.

In recent years, the architectural design process has undergone significant advancements due to computational design, enabling real-time exploration of alternatives through parametric modeling. In the design of buildings, a comprehensive understanding of measurement systems, particularly in the context of natural ventilation, can guide decision-making processes through tests using computational simulations. This paper aims to determine the flow patterns of natural ventilation in indoor environments under five specific conditions using Computational Fluid Dynamics Analysis (CFD) Ansys Fluent^® R22. Five configurations are analyzed and compared to a control sample. Adhering to scientific rigor and employing computational techniques, it was possible to achieve satisfactory inferences for indoor airflow. Our findings indicate that the diagonal positioning of openings substantially accelerates wind speed in indoor environments. This design strategy supersedes the need for more openings when the goal is to enhance air speed and indoor air renewal.