Correlation of CFD predictions and wind tunnel measurements of mean and unsteady wind loads on a large optical telescope

Mamou, Mahmoud; Cooper, Kevin R.; Benmeddour, Ali; Khalid, M.; Fitzsimmons, Joeleff; Sengupta, Raja

doi:10.1016/j.jweia.2007.06.050

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…In most cases, a wind-tunnel test on a specially prepared laboratory model of the building's shape are carried out. Examples of such an analysis can be found in [21,22]. It is the most accurate solution, but it requires high financial outlays for the research.…”

Section: Basic Assumptions Of Numerical Analysismentioning

confidence: 99%

Vaults, roof truss and walls interaction issue in monumental masonry structures

Szkobodziński

Miedziałowski

2018

E3S Web Conf.

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The paper discusses the subject of interaction between a roof truss, vaults and load-bearing walls in a masonry monumental structure. The static structural analysis of the Assumption of the Blessed Virgin Mary Basilica in Bialystok, as an example of Polish neogothic architecture from the turn of the 19th and 20th centuries has been carried out. The building consists of a three-aisled masonry walls system, which in cooperation with cross-ribbed vaults and a timber roof truss determine the spatial rigidity of the structure. Lack of concrete ring-beams and horizontal oriented ceiling slabs cause global stiffness reduction to the horizontal loads. In the past, it could have been one of the main reason for the appearance of cracks in the structure. The basic aspect having a real influence on building global behaviour is interaction of load-bearing structural parts. This structure was subjected to the static analysis with an investigation about the influence of interaction between the roof truss, vaults and walls. The values of horizontal displacements of walls were compared as a result of wind pressure acting on the structure. Numerical calculations were carried out using finite element method.

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Section: Basic Assumptions Of Numerical Analysismentioning

confidence: 99%

Vaults, roof truss and walls interaction issue in monumental masonry structures

Szkobodziński

Miedziałowski

2018

E3S Web Conf.

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“…Complex problems including wind loads on structures could be solved both with wind tunnels and CFD. These methods could be well used in extraordinary shaped buildings such as telescopes (Mamou et al, 2008). There are basically two types of parameters that act as sources of error in CFD results.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of wind comfort with computational fluid dynamics simulations for pedestrian sidewalks around buildings

Aydemir,

Karahüseyin,

Yılmaz

2023

Időjárás

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Wind power could be one of the most clean and powerful renewable resources for electrical energy production, but on the other hand, uncontrolled wind flow especially in urban places could cause undesired situations as damage to buildings, decrease in pedestrian comfort, environmental damage, or even life loss. Construction of high-rise buildings, widely spread structures within cities, and environmental changes forces, engineers to find quick, reliable, and also economically viable solutions during design stages, but wind comfort of sidewalks generally not considered enough even if they are located in crowded areas. The web-based computer aided engineering (CAE) program named Simscale which runs on the basis of sophisticated graphical interface was used as computational fluid dynamics (CFD) software to determine wind speeds under influence of buildings in the Nuh Naci Yazgan University campus. Also, field measurements carried out in campus area for a short term period were compared with long term hourly wind speed data obtained from the Turkish State Meteorological Service (MGM) station located in Kayseri to identify most optimal wind speed data for the research area. Results of analysis showed that wind speed increased in the mostly used paths of campus, which means that the layout of buildings negatively affected the wind comfort. CFD analysis softwares could be used to determine the possible consquences of wind with less economic investment in a short time, and they could be used in accordance with comfort criterias as well as safety regulations.

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“…For example, the first documented case of significant wind load effects on PE was documented by Ulich [1]. The current state-of-the-practice and analysis approach considers the combination of wind tunnel tests and computational fluid dynamics to simulate the wind loads [2][3][4]. Since each structure is unique and effects are on occasion not fully predicted by simulations (i.e.…”

Section: Introductionmentioning

confidence: 99%

Green Bank Radio Telescope: Wind Induced Effects on Feed-Arm

Giaccu¹,

Gallisai²,

White³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Radio Telescopes have been widely used in deep-space exploration and satellite communications. High pointing accuracy is required to be high in these applications, since the beams involved in these measurements are narrow. However, pointing precision can be influenced by wind load effects, which represent a disturbance source for the support structures of the telescope, especially in the high-frequency range. This paper analyzes the wind load effects on the feed arm of the Green Bank Radio Telescope (GBO) for two different wind directions as a function of the wind speed. A Finite Element (FE) Model of the GBO has been assembled to evaluate the dynamic response of the structure against turbulent wind disturbances. The FE model has been updated according to results derived from previously developed models. The paper focuses the attention on the wind induced displacements of the feed arm, which is, for the examined structure, the main source of wind disturbances. The study shows that wind disturbances can deeply affect the pointing accuracy of GBO even at low wind speeds. Namely, for reference mean wind speed of 4 m/s the total along-wind lateral displacements of the feed arm can reach the maximum threshold associated with an acceptable Pointing Error (PE). Furthermore, dis-placements are larger for winds acting in the cross-elevation direction and can deeply affect pointing accuracy of the antenna measurements.

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Correlation of CFD predictions and wind tunnel measurements of mean and unsteady wind loads on a large optical telescope

Cited by 6 publications

References 4 publications

Vaults, roof truss and walls interaction issue in monumental masonry structures

Vaults, roof truss and walls interaction issue in monumental masonry structures

Evaluation of wind comfort with computational fluid dynamics simulations for pedestrian sidewalks around buildings

Green Bank Radio Telescope: Wind Induced Effects on Feed-Arm

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