CFD simulation of hemispherical domes: structural flexibility and interference factors

Sadeghi, Hossein; Heristchian, Mahmoud; Aziminejad, Armin; Nooshin, Hoshyar

doi:10.1007/s42107-018-0040-5

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…Considering the interaction of adjacent structures in determining the wind force of the design of the structures, the ʻ interference factor ʼ, (dif) is defined in Equation (9). In this equation, parameters Cpk and Cp0k are wind pressure coefficient in the presence and absence of interference source(s), respectively (per measurement points, n).…”

Section: Interference Effectmentioning

confidence: 99%

“…The peak pressure coefficients of closed dome roofs were compared with the current Japanese wind load code after examining the characteristics of the medium and peak pressure coefficients. Also, Sadeghi et al [9] simulated hemispherical domes and investigated the influence of the flexibility coefficient on shape factor, comparing the results with those obtained in a wind tunnel. Using numerical modeling based on computational fluid dynamics, Sadeghi et al [10] presented wind pressure coefficients on scalp domes.…”

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confidence: 99%

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Effect of Wind Load on Milad Tower and Adjacent Buildings Case study: Shed Adjacent to Tower

Aleslami

Sadeghi

2023

IJEE

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Tall buildings are subject to wind loads as one of the effective lateral loads. An analysis of the effect of wind on Milad Tower is presented in this research. The wind tunnel testing results and numerical modelling implemented in computational fluid dynamics (CFD) using ANSYS software. For the numerical simulation, the K-epsilon model has been used. The study evaluated the flow around the tower in several deformation states and compared it with a model where the tower is modeled rigidly in the wind tunnel. The maximum coefficient of negative pressure (suction) at the top of the tower structure equals to -1.95, which occurs at  =90 o , and the maximum coefficient of the positive pressure equals +1. Since the buildings near the tower are located a short distance from the tower, the shed's structure, which is located near the tower, has also been investigated. With the aid of Tecplot software. The wind pressure coefficients obtained from the wind tunnel test were plotted. As part of the wind loading analysis in the single-span and two-span shed models, the model is rotated with a step of 5 o relative to the direction of wind application, and wind pressure is recorded.

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Section: Interference Effectmentioning

confidence: 99%

mentioning

confidence: 99%

Effect of Wind Load on Milad Tower and Adjacent Buildings Case study: Shed Adjacent to Tower

Aleslami

Sadeghi

2023

IJEE

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“…The distribution of wind pressure distribution on an object is not only a function of its shape but is also a function of the effect of the nearby objects, according to [3]. Thus, this effect was studied, as well as the Venturi effect and the blowing effect on the external pressure coefficient between the cups.…”

Section: Casementioning

confidence: 99%

“…They concluded that the insertion of a slot into a spherical dome caused an abrupt change in its wind pressure coefficient in the vicinity of this slot. Sadeghi, Heristchian, Aziminejad, and Nooshin [3] compared the numerical results with those obtained from the wind tunnel available in the literature. Then, numerically, the effect of structural flexibility and the neighborhood of the objects on the wind pressure distribution coefficients are studied.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Wind Pressure Coefficients on Different Scallop Dome Configurations

Guerra

Campos

2022

Design, Construction, Maintenance

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The effects of the action of wind on scallop domes were numerically investigated using the software Ansys, as well the interference of the neighborhood on the external pressure coefficient and the streamlines between geometrically identical domes. The influence of the proportion on the neighborhood interference in scallop domes and the variations in the dimensions of the structures on the pressure coefficients and streamlines were also investigated. Five simulations were analyzed involving six-grooved domes and geometry height variations for validation. The numerically obtained coefficients were compared with values in the literature. Other applications investigated the influence of grooves on the external pressure coefficient and the effect of wind on the grooved domes. Another application analyzed the interference of the neighborhood on the external pressure coefficients and streamlines between three geometrically identical domes and, finally, the influence of the proportion in the study of the interference of the neighborhood. Here, the variations in the dimensions of the structure affected the pressure coefficients and the streamlines were analyzed. It was possible to verify the versatility and efficiency of the computational method used in the analysis of the action of wind.

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“…Sadeghi et al 10 obtained wind effect on scallop domes with curve shape code 1 (mentioned above), indicating that it has the maximum effect with the ridge vertical to the wind. Sadeghi et al 11 also studied the flexibility coefficient effect on shape coefficient (C p ) by simulating semi-spherical domes, and compared the results with wind tunnel test results. Recently, Cao and Tamura 12 conducted an LES study on a wall-mounted hemisphere floating in a boundary layer flow with Re = 7, which included critical and supercritical flows.…”

Section: Introductionmentioning

confidence: 99%

Wind effect on scallop domes with negative amplitude and prominence using Experimental and Numerical Study

Nejati

Sadeghi

Heristchian

2023

International Journal of Space Structures

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This study investigates the wind effect on hexa-sectored scallop domes using Computational Fluid Dynamics (CFD) and wind tunnel tests. Similar to the shape of a seashell, the scallop dome is one of the most common domes used to cover large spans. The scallop dome has an additional curvature equal to its sectors compared to a base dome (spherical). Hence, it has better structural efficiency compared to a spherical dome under the same condition. The curvatures on the scallop dome create alternate “ridges” and “grooves” on it. According to the computations of the article, the grooves created on this dome in the sector, as well as their position angle to the wind direction significantly affect pressure coefficient value. Due to these differences, wind pressure on scallop domes significantly differs from wind pressure on spherical domes. The results indicate that the ridges cause negative wind pressure coefficients whose magnitude reaches a maximum of −2.0 for an angle of alignment of 30°. The analyses have been conducted through Ansys-Fluent. This study presents the equation of wind pressure coefficient in the most critical of dome groove positions. The arch created between the grooves of a scallop dome is another effective parameter on maximum negative pressure. In the case study scallop dome, if the wind effect angle is considered α = 15, the maximum deformation in the structure will be created, which is 20% higher than that of α = 0.

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CFD simulation of hemispherical domes: structural flexibility and interference factors

Cited by 7 publications

References 16 publications

Effect of Wind Load on Milad Tower and Adjacent Buildings Case study: Shed Adjacent to Tower

Effect of Wind Load on Milad Tower and Adjacent Buildings Case study: Shed Adjacent to Tower

Numerical Investigation of Wind Pressure Coefficients on Different Scallop Dome Configurations

Wind effect on scallop domes with negative amplitude and prominence using Experimental and Numerical Study

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