Calculation of wind-driven cross ventilation in buildings with large openings

Seifert, Joachim; Li, Yuguo; Axley, James W.; Rösler, Markus

doi:10.1016/j.jweia.2006.04.002

Cited by 88 publications

(48 citation statements)

References 5 publications

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“…Indeed, the so-called sealed-body assumption in the decoupled approach implies that the pressure distribution on the building envelope is not affected by the presence of the openings [20,21,25]. It assumes that the turbulent kinetic energy is dissipated at the windward opening and that the effect of the dynamic pressure on the air flow passing through the opening is negligible [20,25,28,39,73,92]. However, Murakami et al [20], Kato et al [21], Sandberg [93], Karava et al [16,28], Kobayashi et al [71,73] correctly pointed out that in case of wind flow through large ventilation openings, the turbulent kinetic energy is rather preserved and the sealed-body assumption is therefore not longer valid.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

Ramponi

Blocken

2012

Building and Environment

467

271

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• Extensive literature review on numerical cross-ventilation studies in overview table.• Detailed sensitivity analysis for CFD simulations of a cross-ventilated building model.• The SST k-ω turbulence model shows the best agreement with PIV measurements.• The turbulent kinetic energy strongly influences the convergence and the results.• The prediction of the outdoor standing vortex largely affects the indoor airflow. AbstractAccurate CFD simulation of coupled outdoor wind flow and indoor air flow is essential for the design and evaluation of natural cross-ventilation strategies for buildings. It is widely recognized that CFD simulations can be very sensitive to the large number of computational parameters that have to be set by the user. Therefore, detailed and generic sensitivity analyses of the impact of these parameters on the simulation results are important to provide guidance for the execution and evaluation of future CFD studies. A detailed review of the literature indicates that there is a lack of extensive generic sensitivity studies for CFD simulation of natural cross-ventilation. In order to provide such a study, this paper presents a series of coupled 3D steady RANS simulations for a generic isolated building. The CFD simulations are validated based on detailed wind tunnel experiments with Particle Image Velocimetry. The impact of a wide range of computational parameters is investigated, including the size of the computational domain, the resolution of the computational grid, the inlet turbulent kinetic energy profile of the atmospheric boundary layer, the turbulence model, the order of the discretization schemes and the iterative convergence criteria. Specific attention is given to the problem of oscillatory convergence that was observed during some of these coupled CFD simulations. Based on this analysis, the paper identifies the most important parameters. The intention is to contribute to improved accuracy, reliability and evaluation of coupled CFD simulations for cross-ventilation assessment.

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Section: Introductionmentioning

confidence: 99%

CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

Ramponi

Blocken

2012

Building and Environment

467

271

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“…A series of wind tunnel experiment were conducted to examine the wind load on a low-rise structure within an array of buildings of various spacing [5]. On top of that, both experimental and numerical methods have been utilized to investigate the effect of opening configurations on cross ventilation rate [6,7]. Despite the exhaustive research in this field, the influence of surrounding buildings has only been explored in a limited manner.…”

Section: Introductionmentioning

confidence: 99%

Numerical estimation of natural ventilation of cubical urban arrays with different packing density

et al. 2017

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Abstract.In an urban environment where buildings are closely packed, natural ventilation performance is undesirably disturbed by the effect of surrounding buildings. Cross-ventilation refers to the regulation of air within a building, which is essential in providing good air quality and thermal comfort for the occupants. Thus, this study focuses on the impact of packing density on ventilation rate of cross-ventilated buildings. The numerical estimation is performed by means of computational fluid dynamic (CFD) using the Reynolds Averaged Navier-Stokes (RANS) with RNG k -ε (RNG) turbulence model. Three configurations of simplified generic cubes which are regularly aligned with packing density of 25%, 35%, and 50% were considered. Velocity distribution around and inside the buildings as well as the ventilation rate are analysed. The case with packing density of 25% exhibits a reduction of 90% in the ventilation rate compared to the isolated case and continues to decrease as the packing density increase up to 35%. However, further increase of packing density up to 50%, slightly increases the ventilation rate. Hence, the result of this study imposed that surrounding buildings have a substantial influence on ventilation performance of cross-ventilated buildings.

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“…Although some previous studies (Holmes [4]; Ho etal. [5]; Sharma and Richards [6]; James et al [7]; Joachim et al [8]) have shown that wind pressure in a building can be affected by partial opening, and there are not many works on wind-induced response of high-rise buildings with partial opening. In recent years, the use of wind power (Bayoumi et al [9]; Lu and Sun [10]) has become as one of the most interesting research topics.…”

Section: Introductionmentioning

confidence: 99%

Wind Characteristics of High-rise Building with Partial Opening

Yuan¹,

Fan²,

Wang³

2017

Proceedings of the 2016 International Conference on Architectural Engineering and Civil Engineering

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Abstract-The paper discusses the wind pressure distributions on high-rice buildings with partial openings by means of wind tunnel tests and numerical simulations. The wind tunnel tests were carried out in the boundary layer wind tunnel over an urban terrain with a geometric scale. The numerical simulations used the method of S IMPLEC algorithm and the turbulence model, in which a realizable κ-ε model was used to simulate the pressure coefficient and the wind environment surrounding the partial openings. Detailed analyses of wind pressure coefficients for buildings of three different opening cases are presented. The results show that the pressure coefficients are different on the two sides of the opening and the distribution of wind velocity surrounding the opening is remarkably affected by the opening size. Moreover, the wind speed reaches the maximum in the opening when the wind direction is 45°. This suggests that there is a potential to utilize the wind energy by placing wind turbines in the partial opening of the high-rise buildings.

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Calculation of wind-driven cross ventilation in buildings with large openings

Cited by 88 publications

References 5 publications

CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

Numerical estimation of natural ventilation of cubical urban arrays with different packing density

Wind Characteristics of High-rise Building with Partial Opening

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