Wind Tunnel Experiments and CFD Simulations for Gable-Roof Buildings with Different Roof Slopes

Atmaca, Mustafa

doi:10.12693/aphyspola.135.690

Cited by 11 publications

(3 citation statements)

References 20 publications

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“…Leite [22], on the other hand, combined the slope angle of a singlesloped roof with the window opening position and found that the roof slope angle had a significant impact on ventilation airflow, while the vertical position of the outlet opening had a minor effect. Atmaca [23] conducted wind-tunnel experiments and computational fluid dynamics (CFD) simulations on three differently sloped gable roofs, and found that the lowest negative pressure at all roof slopes occurred when the wind direction angle was 90 degrees. Tominaga [24] conducted numerical simulations (CFD) to study the airflow around isolated gable-roofed buildings with different roof slopes and found significant differences in the flow fields for slope ratios of 3:10 and 5:10.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis of Building Cross-Ventilation with Different Angled Gable Roofs and Opening Locations

Shi,

Zhao,

Liu

2023

Buildings

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The geometric shape of the roof and the opening position are important parameters influencing the internal cross-ventilation of buildings. Although there has been extensive research on natural ventilation, most of it has focused on flat or sloping roofs with the same opening positions. There is still limited research on the impact of different opening positions and sloping roofs on natural ventilation. In this study, computational fluid dynamics (CFD) was used to investigate the air exchange efficiency (AEE) in general isolated buildings. These buildings encompassed three distinct opening configurations (top–top, top–bottom, and bottom–top) and six varying slope angles for gable roofs (0°, 9°, 18°, 27°, 36°, and 45°). Computational simulations were carried out using the SST k-omega turbulence model, and validation was performed against experimental data supplied by the Japanese AIJ Wind Tunnel Laboratory. Grid independence validation was also conducted to ensure the reliability of the CFD simulation results. The study revealed that the highest AEE was 48.1%, achieved with the top–bottom opening configuration and a gable roof slope angle of 45°. Conversely, the lowest AEE was 31.4%, attained with the bottom–top opening configuration and a gable roof slope angle of 27°. Furthermore, it was observed that when the opening configuration was set to top–top and bottom–top, the slope angle of the gable roof had minimal influence on AEE, with an average AEE of only around 33%. When the opening configuration was top–bottom, it was found that there was a positive correlation between the gable roof slope angle and AEE.

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Section: Introductionmentioning

confidence: 99%

CFD Analysis of Building Cross-Ventilation with Different Angled Gable Roofs and Opening Locations

Shi,

Zhao,

Liu

2023

Buildings

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“…Part of the existing research administrated by simulation and wind tunnel test on the wind load characteristics of Saw-tooth type greenhouse roof has confirmed that the area most stricken by wind load includes the corners and edges of the roof [20]. Some researchers have placed their focus on the surface wind pressure of Venlo type greenhouses with different spans supported by the sensitivity of different layouts to wind loads, thus providing a reference for the design values of greenhouse wind loads [21].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Wind Tunnel Test on the Wind-Induced Response of Three Typical Types of Greenhouse Main Structures

et al. 2022

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Investigating the wind-induced vibration response of the greenhouse structure, and the wind pressure distribution on its surface takes on a critical significance when the main structure is under large wind loads. A computational fluid dynamics-based study was conducted, and wind tunnel tests were performed to study the wind pressure distribution on the surface of the greenhouse structure. First, three types of greenhouses, including Venlo, Round-arch, and Saw-tooth type greenhouses, were selected as the design models for the study. In addition, the double-span, four-room structure model was built to explore the wind pressure distribution and the extreme wind pressure coefficient on the greenhouse surface for 13 (0°–180°, every 15°) directions of the wind direction to obtain the wind load characteristics in the greenhouse surface under different conditions. The results of the wind tunnel tests were consistent with those of the simulations, with the maximum wind pressure in the X-direction occurring at 30°-wind and the maximum wind pressure in the Y-direction at 75°-wind. The maximum negative wind pressure acting locally on the roof of the greenhouse was twice the maximum positive pressure acting on the windward side of the greenhouse. Accordingly, it is necessary to strengthen the structure in regions sensitive to wind direction with significant response to wind.

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“…Subasi and Gunes performed numerical calculations to represent the effect of a heated plate on local skin friction coefficient and showed that heating delayed transition and decreased the skin friction coefficient in turbulent region [8]. The selection of the appropriate turbulence model in engineering problems involving external flows around UAV (Unmanned Air Vehicles) [9] and buildings [10] is vital to obtain consistent aerodynamic performance characteristics.…”

Section: Introductionmentioning

confidence: 99%

Düz Bir Plaka Üzerindeki Hidrodinamik ve Isıl Sınır Tabaka Akışının Sayısal Olarak İncelenmesi ve Geçiş Kontrolü

Canbolat¹,

Yıldızeli

Köse

et al. 2020

International Journal of Advances in Engineering and Pure Sciences

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In this study, Computational Fluid Dynamics (CFD) calculations are performed with ANSYS-Fluent for an external flow over a flat plate under constant surface temperature conditions. By using an Active Flow Control (AFC) method, the flat-plate is heated to manipulate the transition region. Calculations are performed for a steady and turbulent flow at 15 m/s free-stream velocity. Local skin friction coefficient and local heat transfer coefficient distributions along the flat-plate are investigated for laminar and turbulent boundary layers at various constant surface temperatures. For laminar and turbulent flow boundary layer characteristics, theoretical correlations in the literature are used to verify the numerical results. Results show that theoretical correlations are highly consistent with CFD results only in the laminar and turbulent regions and it is also shown that transition can only be predicted by CFD simulations. On the other hand, heating as an AFC method is found to be useful in delaying transition regime over a flat plate.

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Wind Tunnel Experiments and CFD Simulations for Gable-Roof Buildings with Different Roof Slopes

Cited by 11 publications

References 20 publications

CFD Analysis of Building Cross-Ventilation with Different Angled Gable Roofs and Opening Locations

CFD Analysis of Building Cross-Ventilation with Different Angled Gable Roofs and Opening Locations

Numerical Simulation and Wind Tunnel Test on the Wind-Induced Response of Three Typical Types of Greenhouse Main Structures

Düz Bir Plaka Üzerindeki Hidrodinamik ve Isıl Sınır Tabaka Akışının Sayısal Olarak İncelenmesi ve Geçiş Kontrolü

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