Hybrid RANS-LES Simulation of a Tall Building in a Complex Urban Area
The aerodynamic performance of a building becomes increasingly important as its height protrudes further into the atmospheric boundary layer. For tall buildings, a thorough understanding of the aerodynamics is essential to make informed structural design decisions. However, this is a challenging case for numerical simulation as it involves accurate representation of both the bluff body aerodynamics and the incoming turbulent flow field over a large range of scales. Hybrid RANS-LES methods provide an attractive option for practical cases due to lower mesh requirements close to the wall of complex geometries. In this study, Detached Eddy Simulation has been used to simulate the flow around both an isolated standardised building as well as a tall building in a complex urban environment. Results show a good comparison to wind tunnel data, suggesting that the method could be a valuable tool in the design of tall buildings under wind loading.
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