Wind considered one of the nature forces which greatly influence building’s planning and design. The Wind is the movement of air or to be specific the gases surrounding us in the atmosphere, its mainly caused by the differentiation in air pressure between two zones. it’s classified according to its speed, direction and causes. some of its names: breeze and gale, and strong ones called storm, hurricane or typhoon. Wind blowing strength affect the way we design bracing, doors and windows and also the structure of towers and high-rise buildings.
we analyse the wind for building design for different purposes; either for urban pedestrian comfort, or for building energy saving, or for reaching good ventilation for building users, sometimes we study the wind for understanding how structures such facades and roof units will act in the cases of storms.
For Pedestrian; strong wind causes an uncomfortable feeling, but on the other hand, weak air movement causes the same uncomfortable feeling. For buildings; a strong wind can be a destroyer, parts would start to fall down, and energy will be extremely lost, especially in cold zones. however, weakly blowing wind would make the inner spaces unusable in a passive system, and then a lot of energy-consuming machines need to be deployed.
As we understand that analysing air movement patterns is an important issue for pedestrians and users safety and comfort. it’s advised that designers simulate their buildings masses and interior spaces in early stages of design, previously, at late stages designers used wind tunnels in design, but now with the availability of computational tools such like CFD algorithms, it’s easy now to understand how the wind affect buildings and how can we visualize complex patterns of air currents around buildings and streets, and therefore reach desired safety and comfort precautions.
CFD is a numerical method used to analyse aspects and materials involve fluids. It is brought to us from the field of fluids mechanics, it uses algorithms to solve the problem of liquids and gases move and spread through an environment.
In our experiments we tried to simulate the movement of air around a group of buildings which might affect the pedestrians of the surroundings, and also to understand the areas of the building which might face less ventilation because of wrong mass-ing. we used a CFD technique supported inside Autodesk Vasari, then we investigated the capability of importing the results back into Grasshopper.