ABSTRACT
In order to design buildings with the right dimensions it is necessary to know very exactly all details concerning the airflow around and through buildings. The shape and the size of a building strongly influence the flow in its vicinity. The influence of the variation of the model shape to the flow field is demonstrated through the example of a high building with an additional roof protruding in a position perpendicular to the vertical walls of the model. In earth-surface boundary layer the three-dimensional flow pattern around a building model is visualized by a combined smoke and laser beam sweeping technique and by a surface-coating method. If the model of a lower building is located in front of the skyscraper model, the flow field is strongly influenced by this front building. This is a very important finding on the aerodynamics of high buildings and their influence on the biological sphere around them.
