Investigation of Pressure Distributions on Hemispherical Roofs With Different Eave Types

Yıl 2021, Cilt: 62 Sayı: 705, 702 - 714, 08.12.2021

Tekmile Cürebal Aleyna Ağırman Kalca Yücel Özmen

https://doi.org/10.46399/muhendismakina.941875

Öz

In this study, the flow fields around cylindrical buildings with hemispherical roof geometry have been analyzed experimentally and numerically for two different eaves types (normal and pitched eaves). In the experimental part of the study, the mean pressure distributions on the roof surfaces of the building models placed in the wind tunnel were obtained and flow visualization studies were carried out around the models. In the numerical part, the flow fields around the building models were calculated using the SST k-ω turbulence model. It was observed that the pressure distributions obtained from the numerical study were compatible with the pressure distributions obtained in the experimental study, and the change in the eave type did not cause an important change in the pressure distributions.

Anahtar Kelimeler

Cylindrical building, Hemispherical roof, Eave, Pressure distribution.

Farklı Saçak Tiplerine Sahip Yarı Küresel Çatılar Üzerinde Basınç Dağılımlarının İncelenmesi

Öz

Bu çalışmada, silindirik binaların yarı küresel geometrideki çatıları etrafındaki akış alanları, normal ve yelkıran saçak şeklinde iki farklı saçak tipi için deneysel ve sayısal olarak incelenmiştir. Çalışmanın deneysel kısmında, rüzgâr tüneline yerleştirilen bina modellerinin çatı yüzeylerinde ortalama basınç dağılımları elde edilmiş ve modeller etrafında akış görüntüleme çalışmaları gerçekleştirilmiştir. Sayısal kısımda ise, bina modelleri etrafındaki akış alanları SST k-ω türbülans modeli kullanılarak hesaplanmıştır. Sayısal çalışmadan elde edilen basınç dağılımlarının deneysel çalışmadan elde edilen basınç dağılımlarıyla uyumlu olduğu ve saçak tipindeki değişimin, basınç dağılımlarında belirgin bir değişime yol açmadığı görülmüştür.

Anahtar Kelimeler

Silindirik bina, Yarı küresel çatı, Saçak, Basınç dağılımı.

Kaynakça

• Sabransky, I.J., Melbourne, W.H. 1987. “Design Pressure Distribution on Circular Silos with Conica Roofs”, J. Wind Eng. Ind. Aerod., 26(1), 65-84.
• Portela, G., Godoy, L.A. 2005a. “Wind Pressures and Buckling of Cylindrical Steel Tanks with a Conical Roof”, J. Constr. Steel Res., 61, 786-807.
• Portela, G., Godoy, L.A. 2005b. “Wind Pressures and Buckling of Cylindrical Steel Tanks with a Dome Roof”, J. Constr. Steel Res., 61, 808-824.
• Afgan, I., Moulinec, C., Prosser, R., Laurence, D. 2007. “Large Eddy Simulation of Turbulent Flow for Wall-Mounted Cantilever Cylinders of Aspect Ratio 6 and 10”, Int. J. Heat Fluid Fl., 28, 561-574.
• Uematsu, Y., Moteki, T., Hongo, T. 2008. “Model of Wind Pressure Field on Circular Flat Roofs and its Application to Load Estimation”, J. Wind Eng. Ind. Aerod., 96, 1003-1014.
• Tavakol, M.M., Yaghoibu, M., Masoudi, M.M. 2010. “Air Flow Aerodynamic on a Wall-Mounted Hemisphere for Various Turbulent Boundary Layers”, Exp. Therm. Fluid Sci., 34, 538-553.
• Cheng, C.M., Fu, C.L. 2010. “Characteristics of Wind Loads on a Hemispherical Dome in Smooth Flow and Turbulent Boundary Layer”, J. Wind Eng. Ind. Aerod., 98, 328-344.
• Tsutsui, T. 2012. “Flow Around a Cylindrical Structure Mounted in a Plane Turbulent Boundary Layer”, J. Wind Eng. Ind. Aerod., 104-106, 239-247.
• Özmen, Y. 2013. “Effect of Parapets to Pressure Distribution on Flat Top of a Finite Cylinder”, Wind and Structures, 17 (5), 465-477.
• Sumner, D., Rostamy, N., Bergstrom, N., Bugg, J.D. 2015. “Influence of Aspect Ratio on the Flow Above the Free End of a Surface-Mounted Finite Cylinder”, Int. J. Heat Fluid Fl., 56, 290-304.
• Özmen, Y., Aksu, E. 2017. “Wind Pressures on Different Roof Shapes of a Finite Height Circular Cylinder”, Wind and Structures, 24 (1), 25-41.
• Beitel, A., Heng, H., Sumner, D. 2019. “The Effect of Aspect Ratio on the Aerodynamic Forces and Bending Moment for a Surface-Mounted Finite-Height Cylinder”, J. Wind Eng. Ind. Aerod., 186, 204-213.
• Beitel, A., Sumner, D. 2020. “Characteristics of the Free-End Mean Pressure Distribution for a Surface-Mounted Finite-Height Cylinder”, Int. J. Heat Fluid Fl., 82, 108562.
• Argyropoulos, C.D., Markatos, N.C. 2015. “Recent Advances on the Numerical Modelling of Turbulent Flows”, Appl. Math. Model., 39, 693-732.
• Menter, F.R. 1994. “Two Equation Eddy-Viscosity Turbulence Models for Engineering Applications”, AIAA J., 32, 1598-1605.