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A4: WIND ANALYSIS OF TALL BUILDINGS USING OPENFOAM CFD
The increasing demand for tall buildings necessitates wind analysis for safety and stability. Traditional methods, such as analytical or empirical methods, are time-consuming and expensive. Computational Fluid Dynamics (CFD) offers a more cost-effective solution by simulating airflow over virtual models. CFD helps engineers assess the impact of wind loads, turbulence and pressure on structural stability and performance. OpenFOAM, a free CFD platform, is a popular choice for simulating complex fluid flow problems. However, it lacks visualisation, which can be improved with tools like ParaView. Combining these methods provides valuable insights into wind effects on buildings.
The study uses OpenFOAM, a computational fluid dynamics software, to study wind pressure distribution on tall buildings. The software is studied and familiarised by analysing the ‘ wind around building’ tutorial . The first case involved analysing a CAARC building model with a 12 m/s wind velocity, obtaining velocity and pressure profiles at key locations like inlet, outlet , faces of the building and 100m distance from the building. The second case focused on a regular building with dimensions of 30m x 30m x 100m, obtaining pressure distributions for various wind velocities, u = 10m/s , 12m/s , 14 m/s and 16 m/s at specific time points of 50 seconds and 100 seconds in different locations of the building . The third case examined the combined effects of wind velocity and building height on pressure distribution, investigating pressure distributions for four wind velocities at three different building heights. Height vs. pressure graphs were plotted to visualise pressure variations across the building elevation for each wind speed. The analyses are performed in OpenFOAM CFD and the results are visualised in Paraview, where the graphs obtained from paraview are plotted using GNUplots.
Keywords : CAARC building , OpenFOAM , CFD , pressure profile , velocity profile
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