Computational study of a bluff body aerodynamics: Impact of the laminar-to-turbulent transition modelling

Rizzo, Fabio; D’Alessandro, Valerio; Montelpare, Sergio; Giammichele, Luca

doi:10.1016/j.ijmecsci.2020.105620

Cited by 19 publications

(11 citation statements)

References 31 publications

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“…Figure 1 shows the two geometries of the closed box section tested in a wind tunnel and discussed in this paper. Table 1 summarizes the geometrical parameters illustrated in Figure 2 [3,[22][23][24][25]. Rizzo et al 2018 [7] discussed the trend of the mean pressure coefficients for all fifteen angles of attack tested in a wind tunnel [3].…”

Section: Wind Tunnel Experimental Setup: Pressure Random Processesmentioning

confidence: 99%

“…Based on the discussion of the uncertainty [14][15][16][17][18][19] related to the non-dimensionalization of pressure coefficients [20,21], a wind tunnel experimental campaign was proposed for closed box sections of a suspended bridge [22][23][24][25] carried out with the purpose to investigate the suspended bridge instability due to the wind action [26][27][28][29][30][31][32][33][34]. Section 2 discusses the setup of the experimental tests and the experimental error estimated by observing the stationarity, the Gaussianity [35][36][37], the fluctuation of the mean and standard deviation of the wind tunnel velocity time histories, and the blockage effect [38][39][40][41][42][43][44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

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Sensitivity Investigation on the Pressure Coefficients Non-Dimensionalization

Rizzo

2021

Infrastructures

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The scaling of large structures to investigate their aerodynamics in wind tunnels is a common and robust procedure to estimate important magnitudes, including pressure coefficients. Different aspects can affect the estimation of pressure coefficients; four examples are the non-dimensionalization, blockage, non-stationarity, and non-Gaussianity of the wind tunnel velocity. This paper shows the variability of pressure coefficients due to these four aspects for the case study of a closed box section of a suspended bridge. It was estimated that the pressure coefficients of similar pressure taps vary significantly due to different sets of wind velocity time history used to non-dimensionalize the wind tunnel pressures. In addition, the stationarity of the wind velocity process was not confirmed for all wind velocity sets and the non-Gaussianity of the wind velocity time history was confirmed.

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Section: Wind Tunnel Experimental Setup: Pressure Random Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sensitivity Investigation on the Pressure Coefficients Non-Dimensionalization

Rizzo

2021

Infrastructures

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“…They were compared with the 95% level of confidence of the Davenport peak factor [18][19], for two set of data, pressure coefficients time history of hyperbolic paraboloid roofs [20] (Figs. [3][4][5] and of an example of closed box section for suspended pedestrian bridge [6,13] (Fig. 6).…”

Section: Gaussian and Non-gaussian Processesmentioning

confidence: 99%

“…The wind tunnel experimental campaign is largely used to estimate the wind effects on structures sensitive to the wind. Structures very sensitive to the wind action are generally large span roofs [1][2][3][4][5] as for example tensile structures for which the permanent load is smaller than the wind action, suspended bridges [6] that differently than traditional bridges made of reinforced concrete that are sensitive to the seismic action [7] or steel corrosion [8] can be affected by the flutter instability and finally, high-rise buildings [9] that are slender.…”

Section: Introductionmentioning

confidence: 99%

Gaussian and Non-Gaussian Wind Tunnel Processes

Giovanni¹,

D’Asdia²

2021

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

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The wind-structure interaction for structures sensitive to the wind action is commonly investigated through experimental campaigns in wind tunnel. Aerodynamic tests on rigid body models are carried out to estimate pressure coefficients that in turn are used to estimate the wind action on the prototype surfaces. Pressure taps are located on the model surfaces and pressure scanners acquire pressure time histories. Pressure coefficients are calculated from pressure series, they are dimensionless values and they are nondimensionalized on the wind velocity. In the wind tunnel, the flow is assumed stationary and consequently the mean value of pressure coefficient time history is independent of the experiment time length. However, the acquisition time length affects peak values and in particular the peak factor. In addition, the most of processes acquired near edges and near the flow detachment zones are non-Gaussian, contrary to what codes and standard suggest. It was estimated that several processes on the surfaces of a rigid body are non-Gaussian and, in this case, the mean value is not significant. At contrary, the mean value is mostly assumed as representative value of a measurement and it is used to size the structure. It is true only for some specific zones. In addition, they depend on the wind angle of attack. The purpose of this study is to discusses the Gaussian and non-Gaussian processes localization for two examples of structure families, large span roofs and bridge closed box section using aerodynamic experiments given by literature. The geometries subject of this investigation are typical geometries of roofs and bridge sections sensitive to wind action as for example cable nets roofs and suspended bridges.

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“…Another issue is CFD simulation. The issue is described in more detail in the work of F. Rizzo, et al (2020) [15]. The authors discussed the results of computational fluid dynamics simulations, and one of the goals of the research was to analyze the impact of modeling the laminar to turbulent transition.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Pressure Distribution on a Single-Family Building Caused by Standard and Heavy Winds Based on a Numerical Approach

Lamparski,

Dutkiewicz

2024

Applied Sciences

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The aim of this research is to analyze the pressure distribution caused by wind pressure on the structure of a single-family house. The research object is a model reflecting a real structure, which was damaged in 2018 because of heavy winds. The main idea is to create numerical models using various complex structural analysis software and compare the results. The obtained results will be compared with each other to analyze the impact of various factors, hereinafter referred to as boundary conditions, on the pressure values in characteristic places of the facility. The values closest to the normal distribution will be compared to the actual damage to the house structure. The essence of the research will be the identification of phenomena occurring during the action of heavy winds in global conditions (European and American), considering modifications and different ways of creating seemingly similar numerical models and the way they work. Everything will be compared with each other to find the most optimal design method in the given programs and to obtain wind pressure results that are closest to the real ones.

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Computational study of a bluff body aerodynamics: Impact of the laminar-to-turbulent transition modelling

Cited by 19 publications

References 31 publications

Sensitivity Investigation on the Pressure Coefficients Non-Dimensionalization

Sensitivity Investigation on the Pressure Coefficients Non-Dimensionalization

Gaussian and Non-Gaussian Wind Tunnel Processes

Analysis of Pressure Distribution on a Single-Family Building Caused by Standard and Heavy Winds Based on a Numerical Approach

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