Wind and Structures

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Practical applications of computational fluid dynamics to wind design of high-rise buildings

  • Min Kyu Kim (Department of Architecture and Architectural Engineering, Seoul National University) ;
  • Soonpil Kang (Department of Applied Mathematics, Naval Postgraduate School, 1 University Circle) ;
  • Thomas H.-K. Kang (Department of Architecture and Architectural Engineering, Seoul National University)
  • Received : 2024.02.23
  • Accepted : 2024.09.08
  • Published : 2024.10.25
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Abstract

An accurate assessment of aerodynamic effects on structures is essential for a reliable wind design for high-rise buildings. Turbulence model is a key ingredient of computational fluid dynamics (CFD) in calculating the wind flow fields. This paper aims to identify the properties of representative RANS and LES models particularly for wind load determination. The models investigated are the realizable k-ε model for RANS and the dynamic Smagorinsky model for LES. In this study, their application aspects are discussed to provide enhanced reproducibility and reliability. The airflow around a building at Reynolds number 76,000 is simulated and the numerical results are also compared with wind tunnel experiment data. The wind design loads, such as story shear forces and overturning or torsional moments, are calculated based on the numerical results. Both RANS and LES models accurately capture surface pressure profiles, while LES results demonstrate proper energy decay in the power spectra. The numerical results highlight the effects of aspect ratio of building and the attack angle on the wind loads. This information would be of great help in designing tall buildings resilient to wind environments using CFD models.

Keywords

Acknowledgement

This work was supported by National Research Foundation of Korea (Grant No. NRF-2021R1A5A10). This support is gratefully acknowledged.

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