Abstract
This work shows that the presence of a forebody solid screen fixed at a relatively small distance can significantly influence the global aerodynamic behavior of a square cylinder, even for a flow perpendicular to the screen and in presence of free-stream turbulence. The present investigation represents an extension of previous two-dimensional experimental and numerical studies conducted by the same Authors on rectangular and square cylinders in smooth flow. Experiments in the wind tunnel were carried out by reproducing two different homogeneous isotropic turbulent flows and setting different distances between the screen and the front face of the prism. The pressure measurements revealed in turbulent flow qualitatively the same behaviour observed in smooth flow, though the effects of the screen are less pronounced. In particular, a pressure reduction immediately behind the front corners, a fast recover of it moving towards the back corners, and a strong variation of the lateral force coefficient in the direction of stability are the most apparent features.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Gerhardt, H.J., Janser, F.: Wind loads on wind permeable facades. J. Wind Eng. Ind. Aerodyn. 53, 37–48 (1994)
Manara, G.: Some topics about wind engineering that curtain walling design might be longing for in standards. In: Ricciardelli, F., Avossa, A.M. (eds.) Proceedings of the XV Conference of the Italian Association for Wind Engineering IN-VENTO2018, Napoli, pp. 17–31 (2019)
Lou, W., Huang, M., Zhang, M., Lin, N.: Experimental and zonal modeling for wind pressures on double-skin facades of a tall building. Energy Build. 54, 179–191 (2012)
Hu, G., Hassanli, S., Kwok, K.C.S., Tse, K.T.: Wind-induced responses of a tall building with a double-skin façade system. J. Wind Eng. Ind. Aerodyn. 168, 91–100 (2017)
Hassanli, S., Hu, G., Kwok, K.C.S., Fletcher, D.F.: Utilizing cavity flow within double skin façade for wind energy harvesting in buildings. J. Wind Eng. Ind. Aerodyn. 167, 114–127 (2017)
Giachetti, A., Bartoli, G., Mannini, C.: Aerodynamics of a tall building equipped with a solid screen close to the façade. J. Wind Eng. Ind. Aerodyn. 225, 104999 (2022)
Koenig, K., Roshko, A.: Experimental study of geometrical effects on the drag and flow field of two bluff bodies separated by a gap. J. Fluid Mech. 156, 167–204 (1985)
Cooper, K.R.: The use of a forebody plate to reduce the drag and to improve the aerodynamic stability of a cylinder of square cross-section. J. Wind Eng. Ind. Aerodyn. 28, 271–280 (1988)
Giachetti, A.: Wind effects on permeable building envelopes: a two-dimensional exploratory study. PhD Thesis, University of Florence – TU Braunschweig (2018)
Giachetti, A., Bartoli, G., Mannini, C.: Two-dimensional study of a rectangular cylinder with a forebody airtight screen at a small distance. J. Wind Eng. Ind. Aerodyn. 189, 1–11 (2019)
Giachetti, A., Bartoli, G., Mannini, C.: Wind effects on permeable building envelopes of tall buildings: main issues and potentialities. CTBUH J. 2019 (3) (2019)
Bearman, P.W., Morel, T.: Effect of the free stream turbulence on the flow around bluff bodies. Prog. Aerosp. Sci. 20(2–3), 97–123 (1983)
Bearman, P.W., Obasaju, E.D.: An experimental study of pressure fluctuations on fixed and oscillating square-section cylinders. J. Fluid Mech. 119, 297–321 (1982)
Lander, D.C., Letchford, C.W., Amitay, M., Kopp, G.A.: The influence of the bluff body shear layers on the wake of a square prism in a turbulent flow. Physical Review Fluids 1, 044406 (2016)
Lee, B.E.: The effect of turbulence on the surface pressure field of a square prism. J. Fluid Mech. 69, 263–282 (1975)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2024 The Author(s), under exclusive license to Springer Nature Switzerland AG
About this paper
Cite this paper
Giachetti, A., Bartoli, G., Mannini, C. (2024). Free-Stream Turbulence Effects on a Square Cylinder with a Forebody Screen at a Small Distance. In: Schito, P., Zasso, A. (eds) Proceedings of the XVII Conference of the Italian Association for Wind Engineering. IN VENTO 2022. Lecture Notes in Civil Engineering, vol 461. Springer, Cham. https://doi.org/10.1007/978-3-031-53059-3_18
Download citation
DOI: https://doi.org/10.1007/978-3-031-53059-3_18
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-031-53058-6
Online ISBN: 978-3-031-53059-3
eBook Packages: EngineeringEngineering (R0)