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Abstract

The analyses aim to determine aerodynamic force coefficients in the case of airflow around two smooth or rough cylinders positioned at different angles to the direction of wind velocity. Such systems, for instance, may be part of a tubular water slide. The results were compared with the values of the interference coefficient of the cylinders arranged in a row included in Eurocode EN 1991 part 4. The aerodynamic forces of the cylinder systems were determined on the basis of experimental tests conducted in a wind tunnel. To verify the above results, CFD (computational fluid dynamics) simulations were prepared. An important observation is that for the angle of yaw β = 0◦, the negative component of the lift force (lateral) fy is shown, while for the other cases, the situation is opposite and the lateral force points outside the gap (upward). The second is that the results of aerodynamic drag for rough cylinders arranged in a row and calculated according to EN 1991 part 4 may be underestimated. The flow around the pair of smooth cylinders is quite different from that of the rough ones, because during the experiment the first falls into the critical flow regime, while the second has supercritical characteristics.
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Authors and Affiliations

Agnieszka Padewska-Jurczak
1
ORCID: ORCID
Piotr Szczepaniak
1
ORCID: ORCID
Ryszard Walentyński
1

  1. Faculty of Civil Engineering, Department of Mechanics and Bridges, ul. Akademicka 5, 44-100 Gliwice, Poland
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Abstract

The subject of the wind tunnel tests is a steel chimney 85 m high of cylindrical – type structure with a grid-type curtain structure situated at its upper part. The model of the upper part of the chimney made in the scale of 1:19 was equipped with 3 levels of wind pressure measurement points. Each level contained 24 points connected with pressure scanners. On the base of the pressure measurements, both mean and instantaneous aerodynamic drag and side force coefficients were determined. Next wind gust factors for these two wind action components were determined. Moreover, for each pressure signal Fast Fourier Transform was done. Mean wind action components were also determined using stain gauge aerodynamic balance. Obtained results make possible to conclude that the solution applied in the upper part of the designed chimney is correct from building aerodynamics point of view. Some minor vortex excitations were observed during model tests of the upper part of the chimney. The basic dynamic excitation of this part of the chimney is atmospheric turbulence.
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Bibliography



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Authors and Affiliations

Andrzej Flaga
1
ORCID: ORCID
Renata Kłaput
1
ORCID: ORCID
Łukasz Flaga
1
ORCID: ORCID
Piotr Krajewski
1
ORCID: ORCID

  1. Cracow University of Technology, Faculty of Civil Engineering, Wind Engineering Laboratory, Jana Pawła II 37/3a, 31-864 Cracow

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