Numerical investigation of wind load characteristics around an isolated tall building

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2021-2-10

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Demirbaş, Gökalp Doğukan

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As a common practice, wind loads on tall buildings are calculated using empirical formulas with several assumptions described within Turkish Standards: TS498 and TS EN 1991-1-4. Since these standards are mainly based on past site experiences and wind tunnel tests, these formulas become invalid with distinctive designs and the increase in the building height. With the development of computer technology, computational fluid dynamics (CFD) tools have become common in calculating wind loads on tall buildings. Within this study's scope, wind-induced effects on an isolated 182.88 m x 45.72 m x 30.48 m tall building were investigated by utilizing SpalartAllmaras based Detached eddy simulation (S-A DES) under inhomogeneous and anisotropic turbulent flow (i.e., strong winds) within the neutral atmospheric boundary layer. To generate inflow boundary conditions, a synthetic inflow turbulence generation technique called “Consistent Discrete Random Flow Generation” was used. An excellent agreement in mean pressure coefficients with wind tunnel data was obtained on the building's windward and crosswind surfaces. Similar but slightly underestimated mean pressure coefficients were obtained on the leeward surface. Furthermore, wind flow characteristics such as horseshoe vortex formation and recirculation zone around the building were investigated in detail.

Subject Keywords

CFD, S-A DES, Atmospheric boundary layer, Synthetic inflow turbulence generation, Wind flow characteristics around tall building

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https://hdl.handle.net/11511/89630

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

G. D. Demirbaş, “Numerical investigation of wind load characteristics around an isolated tall building,” M.S. - Master of Science, Middle East Technical University, 2021.