Airflow patterns around obstacles with arched and pitched roofs: Wind tunnel measurements and direct simulation

Ντίνας, Γεώργιος Κ.; Zhang, G.; Fragos, V.P.; Bochtis, Dionysis; Nikita-Martzopoulou, C.

doi:10.1016/j.euromechflu.2013.09.004

Cited by 34 publications

(18 citation statements)

References 40 publications

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“…The modified Durbin k − ε turbulence model, tested on a flat roof in Toja-Silva et al [18], is validated twice by comparing simulation results with those obtained from the wind tunnel experiment carried out by Ntinas et al [24].…”

Section: Additional Validation Of Numerical Schemes Using a Curved Romentioning

confidence: 99%

“…The geometry of the problem is the same as the wind-tunnel experiment of Ntinas et al [24], and it is shown in detail in Figure 1. The building has a curved roof, and its transverse length is infinite (the whole transverse domain).…”

Section: Additional Validation Of Numerical Schemes Using a Curved Romentioning

confidence: 99%

“…Since we calculate the inlet wind profiles of the full-scale simulations according to Richards and Hoxey [25], we use also this methodology in order to validate it by comparing the simulation results with the experimental data obtained by Ntinas et al [24]. We consider the reference values used in the experiment: averaged wind velocity (U ) inlet and the turbulent kinetic energy reference value of k = 0.011264 m 2 ·s −2 .…”

Section: Additional Validation Of Numerical Schemes Using a Curved Romentioning

confidence: 99%

“…The refinement distance around the building surfaces is 0.1 m. Figure 3 shows the final mesh obtained. A quantitative analysis is carried out by comparing the numerical results for U and k with the experimental values of Ntinas et al [24] on the vertical axes located at the central plane of the domain according to the diagram shown in Figure 1.…”

Section: Additional Validation Of Numerical Schemes Using a Curved Romentioning

confidence: 99%

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On Roof Geometry for Urban Wind Energy Exploitation in High-Rise Buildings

et al. 2015

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The European program HORIZON2020 aims to have 20% of electricity produced by renewable sources. The building sector represents 40% of the European Union energy consumption. Reducing energy consumption in buildings is therefore a priority for energy efficiency. The present investigation explores the most adequate roof shapes compatible with the placement of different types of small wind energy generators on high-rise buildings for urban wind energy exploitation. The wind flow around traditional state-of-the-art roof shapes is considered. In addition, the influence of the roof edge on the wind flow on high-rise buildings is analyzed. These geometries are investigated, both qualitatively and quantitatively, and the turbulence intensity threshold for horizontal axis wind turbines is considered. The most adequate shapes for wind energy exploitation are identified, studying vertical profiles of velocity, turbulent kinetic energy and turbulence intensity. Curved shapes are the most interesting building roof shapes from the wind energy exploitation point of view, leading to the highest speed-up and the lowest turbulence intensity.

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Section: Additional Validation Of Numerical Schemes Using a Curved Romentioning

confidence: 99%

Section: Additional Validation Of Numerical Schemes Using a Curved Romentioning

confidence: 99%

Section: Additional Validation Of Numerical Schemes Using a Curved Romentioning

confidence: 99%

Section: Additional Validation Of Numerical Schemes Using a Curved Romentioning

confidence: 99%

See 2 more Smart Citations

On Roof Geometry for Urban Wind Energy Exploitation in High-Rise Buildings

et al. 2015

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“…Urban geometry affects the mean flow and turbulence significantly [1] and there by exerts a strong control on dispersion processes [2]. In this context, Ntinas et al [3] predicted the airflow around buildings that is challenging due to the dynamic characteristics of wind. A time-dependent simulation model has been applied for the prediction of the turbulent airflow around obstacles with arched and pitched roof geometry, under wind tunnel conditions.…”

Section: Introductionmentioning

confidence: 99%

Impact of Shape of Obstacle Roof on the Turbulent Flow in a Wind Tunnel

Driss¹,

Driss²,

Kammoun³

2014

AJER

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In this paper, we are interested in the impact of shape of obstacle roof on the turbulent flow in a wind tunnel. Particularly,arched, inclined, pitched and flat roofs obstacles are examined. A three-dimensional flow of a fluid is numerically analyzed using the Navier-Stokes equations in conjunction with the standard k-ε turbulence model. These equations were solved by a finite-volume discretization method. The comparison between our numerical and experimental results shows a good agreement and confirms the numerical method.

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