Impact of Turbulence Models of Wind Pressure on two Buildings with Atypical Cross-Sections

Michal Franek,Marek Macák,Oľga Hubová,Oľga Ivánková

doi:10.2478/cee-2021-0044

Michal Franek, Marek Macák + Show 2 more

Open Access

https://doi.org/10.2478/cee-2021-0044

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Abstract

Abstract The article deals with the numerical analysis of the wind pressure distribution on a group of two high-rise buildings of different shape for different wind directions. The first building has the shape of a circular cylinder and the second was created by a combination of semicircles and a longitudinal member. The floor plan of the second building was similar to the letter S. The simulations were realized as 3D steady RANS. CFD results were compared with experimental measurements in the wind tunnel of the Slovak University of Technology in Bratislava. The results were processed using statistical methods such as correlation coefficient, fractional bias and fraction of data within a factor of 1.3, which determined the most suitable CFD model. The purpose of the present article was to verify the distribution of the external pressure coefficient on scale models at a scale of 1:350, which are located in the Atmospheric Surface Layer (ASL). In numerical modeling, the most important thing was to ensure similarity with the flow in the experimental Atmospheric Boundary Layer (ABL) and with the flow around the models. SST k–ω was evaluated as the most suitable turbulent model for the given type of problem. Turbulent models had a decisive influence on the overall distribution of external wind pressures on objects. The results showed that the most suitable orientation of the objects in terms of the external wind pressure coefficient is 0°, when the cylinder produced a shielding effect, with min mean cpe = −0.786. The most unfavorable wind effects were shown by the wind direction of 90° and 135° with the value min mean cpe = −1.361.

Highlights

The advances and increasing accuracy of computer simulations lead to a significant increase in applications in wind engineering
On the basis of the selected turbulent model, the extremes of pressures and suctions are verified, which appear on the models in different wind directions from the point of view of the perimeter cladding
In terms of the presented results and conclusions, we evaluate the use of 3D steady Reynolds Averaged NavierStokes equations (RANS) models as suitable for preliminary analysis of the results and their use for further research

Summary

Introduction

The advances and increasing accuracy of computer simulations lead to a significant increase in applications in wind engineering. Especially in modelling the boundary layer of the atmosphere, it is necessary to develop simulation programs in cooperation with experimental measurements in wind tunnels. The use and combination of these solutions can lead to a more accurate understanding of the phenomenon of turbulent flow. The area dealing with simulation methods in wind engineering is called Computational Wind Engineering (CWE). CWE is primarily defined as the use of computational fluid dynamics (CFD) for wind engineering, it includes other approaches to computer modelling as well as field and wind tunnel measurements supporting the development and evaluation of CWE models [3]. The use of computational simulation of wind flow is a relatively cheap and fast solution. We see the main advantage in that it provides a

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