In cooperation with Bluesky, we offer extensive services within the scope of buildings’ aerodynamics. The services include measurements and predictions (Bluseky), as well as CFD flow simulations based on existing data, which allow anticipating airflows in and around buildings.
Airflow around buildings – wind comfort – pedestrian amenity
Wind conditions around high buildings result from complex interactions between wind flows and the geometry of buildings. Expected wind and wind comfort can hardly be assessed by conventional engineering methods. CDF simulations and wind comfort analyses are ideal in order to verify architects’ drafts and to illustrate the three-dimensional wind flows in the vicinity of buildings. Furthermore, based on these analyses, necessary changes or adaptations can be tested while still in the development stage.
Airflow in buildings
Airflow within buildings rarely gets evaluated while planning a project, because the planners themselves think airflow within buildings plays a minor role. As a result, airflow and temperature stratification in buildings is often unfavourable. Possible problems can reach from constant draughts arising from stack effects or poorly dimensioned ventilation systems to areas within the buildings, where temperatures are clearly too high (caused by solar irradiation or high internal thermal loads).
CFD simulations can provide crucial information prior to building e.g. event halls, high interior spaces, rooms with accurately predefined artificial ventilation, industrial buildings or even intensive care units.
The local air velocity and the local air exchange are very important for air conditioning systems of rooms or halls. High air velocities in the areas where people normally remain have to be avoided. Dependent on the activities of people inside the room, high air velocities can cause people to feel uncomfortable. For the design of air conditioning systems, architects and engineers can normally only rely on empirical estimation formulas and tabulated experience. In case of complex and big projects, this can easily lead to wrong designs of the air conditioning system (especially the inlet nozzles).
CFD simulation provides detailed information on the local airflow (e.g. air velocity) for every point of the room or hall. Additionally, different scenarios can be modeled and simulated virtually.
• Variant heat sources and moisture loading depending on the number of people inside a room
• Varying number of people in different areas of the room
• Cooling in summer or heating in winter
• Impact of additional heat sources like light systems in room
This modeling resolution allows engineers and architects to check new air condition concepts for challenging projects or to improve existing systems.
There is no limit to the creativeness of architects and planners of facades, which, from an engineer’s perspective, sometimes causes adventurous constructions. CFD simulations and applied thermodynamics allow performing detailed analyses and therefore gaining insight into the façade-system.
Analyses of façade-systems reach from detailed calculations of wind loads on facades using 3D CFD flow simulations to simulations of the cooling system of rear-ventilated facades in combination with solar irradiation and internal heating or cooling, respectively.