Distribution of the external pressure coefficients on the elliptic tower: experimental measurement compared with numerical modelling

Michal Franek,Oľga Hubová,Marek Macák,J Melcer,K Kotrasová,I Major,A.V Benin

doi:10.1051/matecconf/202031300047

Michal Franek, Oľga Hubová + Show 5 more

Open Access

https://doi.org/10.1051/matecconf/202031300047

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Abstract

The wind flow around the elliptical object was investigated experimentally in the BLWT wind tunnel in Bratislava and subsequently solved by computer wind flow simulation. On a high-rise building model, the external wind pressure coefficients were evaluated for different wind directions and then compared with the numerical CFD simulation in ANSYS, where different models of turbulence and mesh types were used. The aim of the article was to evaluate and compare the obtained values and after analysing the results to choose the most suitable model of turbulence and mesh types, which showed the smallest deviations from the experimental values.

Highlights

At present, we are observing increasing trends in building of high-rise buildings of circular or elliptical shape
The evaluation parameter of this work was the difference between the external wind pressure coefficients from the experiment and from the simulations at individual points on the model
All values for middle level and 0 ° wind direction for various meshing methods and turbulence models are shown in Table 1 and 2

Summary

Introduction

We are observing increasing trends in building of high-rise buildings of circular or elliptical shape. Since it is not possible to find information about the effects of wind on elliptical towers in the standards, it is necessary to carry out a detailed experimental and numerical analysis for a given type of structure. The vortices created behind the elliptical structure can cause a vibration perpendicular to the wind direction, similar to the Kármán effect. Maximal negative values of the external pressure coefficient can reach higher values than from the codes specification [1]. First experiments of circular shapes were done by Strouhal in 1878. It is mentioned in publication of Zdravkovich [3]. Overall external pressures may be greatly increased when the building is in real conditions, such as in urban exposure [4]

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