CFD-RANS model validation of turbulent flow in a semi-idealized urban canopy

Hertwig, Denise; Efthimiou, George C.; Bartzis, John G.; Leitl, Bernd

doi:10.1016/j.jweia.2012.09.003

Cited by 78 publications

(54 citation statements)

References 34 publications

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“…Both situations, isolated block and whole district, are simulated to approximate the numerical value of the wind pressure on the envelope of buildings in the simulated urban environment. The accuracy of the results of the scaled experiences under RANS turbulence models with Enhanced Wall Treatment (EWT) satisfy the requirements of representativeness for the analysis of the aerodynamic behavior near façades [39]. The results are obtained with a convergence criterion lower than 10 −8 for which more than 25,000 iterations are required for each case.…”

Section: Wind Pressuresmentioning

confidence: 99%

Methodology Applied to the Evaluation of Natural Ventilation in Residential Building Retrofits: A Case Study

2017

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Abstract:The primary objective of this paper is to present the use of a steady model that is able to qualify and quantify available natural ventilation flows applied to the energy retrofitting of urban residential districts. In terms of air quality, natural ventilation presents more efficient solutions compared to active systems. This method combines numeric simulations, through the utilization of Ansys Fluent R15.0 ® and Engineering Equation Solver EES ® , with on-site pressurization tests. Testing consists of the application of the seasonal pressure gradient on the building's envelope and the calculation of the ventilation flows in three climatic representative conditions (summer, winter, and annual average). Through the implementation of this methodology to existing buildings it is possible to evaluate the influence of the built environment, as well as key parameters (relative height of the dwelling, number of vertical ventilation ducts, and airtightness of windows) of available natural ventilation.

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Section: Wind Pressuresmentioning

confidence: 99%

Methodology Applied to the Evaluation of Natural Ventilation in Residential Building Retrofits: A Case Study

2017

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“…Further measurement data is available from wind tunnel data sets like the 'Michel-Stadt' semiidealised urban dataset of [7] which also include squares, among other features of an urban geometry. So there is experimental and numerical data available on the flow and dispersion field in squares [8][9][10]. However, the specialities of the flow in the squares were not separately addressed in the aforementioned studies.…”

Section: Introductionmentioning

confidence: 99%

Flow and Dispersion Phenomena in a Simplified Urban Square

Bálczó

Lajos

2015

Period. Polytech. Civil Eng.

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“…A1-4 model allows research on how isolated hexahedral volumes and shapes impact in the air behaviour. This validation facilitates the analysis of the dynamic performance and response of the solid against the action of the air in motion and the impact on subsequent dynamic development 57 what it was previously treated. 50 The verification process generates the same physical conditions ( Table 1) that were established during the tests done by EWTL in the interior of the wind tunnel and checks the different turbulence models by analysing the various possibilities of improvement and comparing them with the reduction in processing times and the resulting data accuracy ( Figure 5).…”

Section: Validation Of the Cfd Modelmentioning

confidence: 92%

Wind velocity effects on the quality and efficiency of ventilation in the modelling of outdoor spaces. Case studies

Padilla-Marcos

Feijó-Muñoz

Meiss

2015

Building Services Engineering Research and Technology

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Outdoor spaces are air volumes between buildings that are open to atmospheric air. Surrounding buildings hinder and alter airflow, which affect the exchange process and its quality. Given that this outdoor air is captured to ventilate a building's interior, the geometric characteristics and wind exposure of these outdoor spaces are vital to optimising these processes. One of the parameters under study is the variable wind speed. The goal of this article is to ascertain whether different wind velocities affect airflow patterns in these spaces. To this end, eight archetypal shape/volumetric cases of urban buildings are examined from an air exchange efficiency perspective. Practical application: The result is described by a mathematical expression that links the exchange efficiency with a range of wind velocities (0.75-6.00 m/s), which confirmed that this wind velocity range implies variations of only AE1.0% in interior courtyards, AE1.6% in adjacent exterior spaces between buildings, and AE2.4% in the considered control volume.

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CFD-RANS model validation of turbulent flow in a semi-idealized urban canopy

Cited by 78 publications

References 34 publications

Methodology Applied to the Evaluation of Natural Ventilation in Residential Building Retrofits: A Case Study

Methodology Applied to the Evaluation of Natural Ventilation in Residential Building Retrofits: A Case Study

Flow and Dispersion Phenomena in a Simplified Urban Square

Wind velocity effects on the quality and efficiency of ventilation in the modelling of outdoor spaces. Case studies

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