Study on Wind Flow Behaviours of High Rise Buildings with CFD Simulation

Wind distribution flows are very important for designer to develop new urban planning and new design buildings. The aim of this paper research was to investigate wind flow behaviours around the buildings cluster.  Present work used a three dimensional scale down model of buildings where transient flow analysis was done. CFD (Computational Fluid Dynamics) simulation is the main research method to investigate the wind environment around building complexes. Numerical investigation of air flow pattern around a cluster of existing high rise structures located in Mandalay city was carried out. It has been implemented through ANSYS Fluent 17.0 using SIMPLE algorithm as solver. Standard k- ɛ model was used for turbulence modelling. The inflow Basic Wind Speed in Mandalay is 80 mph. The inflow wind velocity profile with height is computed by power law equation and imposed by UDF (C+ program). This simulation was carried out to study the effect of wind directions on velocity distribution around the structures and wind pressure coefficient on the face of the L shape building. Analysis was performed at eight wind directions such as N, NE, E, SE, S, SW, W and NW. In these simulation results, high stream line velocities are especially entering into the east side of the Condo A building as obstacles on the wind pathway from the interval between Tower building and L-shape building. When wind strikes building, causing a positive pressure zone to be formed on the windward face and a negative pressure zone is created at the sides and leeward face of the building.