Investigation On Computational Fluid Dynamics (CFD) Simulation for Wind Effects On Tall Tapered Buildings

The modern day structures are very tall, slender and flexible due to the use of high strength materials for construction. Although these flexible structures satisfy the strength criteria safely, it is sensitive to wind-induced excitations causing discomfort to the building and its occupants. The mitigation of across-wind responses is a major factor in design of tall buildings. Hence aerodynamic modification of the building shape becomes important to diminishing the wind-induced excitation. In the present study tall building with tapered cross section shape is considered. Numerical simulations using Computational Fluid Dynamics (CFD) techniques are carried out to study the effect of wind components on the tall tapered building. The modelling and meshing is done using ICEM software and the model analysis and solving is done using ANSYS FLUENT 15 software. Various Reynolds Averaged Navier Stokes (RANS) based turbulence models like Renormalization Group (RNG) k-É› model and Realizable k-É› model are used in finding the force co-efficient. The effectiveness of these models is evaluated by comparing it with the experimental results taken form literatures.