Computational analysis of the performance of a venturi-shaped roof for natural ventilation: Venturi-effect versus wind-blocking effect

Blocken, Bje Bert; Hooff, van Taj Twan; Aanen, L.; Bronsema, B

doi:10.1016/j.compfluid.2011.04.012

Cited by 63 publications

(25 citation statements)

References 33 publications

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“…The accuracy and reliability of CFD simulations are a main concern [5,45]. They impose the need for (1) validation studies and (2) sensitivity studies including solution verification.…”

Section: Introductionmentioning

confidence: 99%

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

Ramponi

Blocken

2012

Building and Environment

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452

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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“…The accuracy and reliability of CFD simulations are a main concern [5,45]. They impose the need for (1) validation studies and (2) sensitivity studies including solution verification.…”

Section: Introductionmentioning

confidence: 99%

“…[35][36][37][38]) and Computational Fluid Dynamics (CFD) models (e.g. [8,[21][22][23][24][39][40][41][42][43][44][45]). CFD has a number of clear advantages compared with the other approaches (e.g.…”

Section: Introductionmentioning

confidence: 99%

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

Ramponi

Blocken

2012

Building and Environment

Self Cite

452

271

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show abstract

“…[39,[51][52][53][54][55][56][57][58][59][60]). This review of the literature shows that almost no studies have been conducted on the effect of roof inclination in combination with asymmetric positions of the vertical openings in the building facade.…”

Section: Introductionmentioning

confidence: 99%

CFD analysis of cross-ventilation of a generic isolated building with asymmetric opening positions: Impact of roof angle and opening location

Perén

Hooff

Leite

et al. 2015

Building and Environment

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151

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“…Typical building façades include a venturi-shaped roof [13], wind catchers [9,[14][15][16], a ventilation shaft [17], wing walls [8], a balcony [7,10,11,18], and eaves [5,6,21]. Prajosan and Sharples [17] proposed a ventilation shaft system to increase the indoor air velocity and thermal comfort in a single-sided residential unit.…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers have utilized the aerodynamic potential of building façades to investigate their enhancement effect on indoor and outdoor airflow exchanges for both cross and single-sided ventilation buildings [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Typical building façades include a venturi-shaped roof [13], wind catchers [9,[14][15][16], a ventilation shaft [17], wing walls [8], a balcony [7,10,11,18], and eaves [5,6,21].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Single-Sided Ventilation with Overhang in Buildings

2016

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Abstract:Enhancing the ventilation performance of energy-efficient buildings with single-sided openings is important because their ventilation performance is poor and strongly depends on the wind conditions. We considered an overhang as a potential building façade for improving the single-sided ventilation performance. We performed numerical simulations of three-dimensional unsteady turbulent flows over an idealized building with an overhang in order to investigate the effect of the overhang on the ventilation performance. Parametric studies were systematically carried out where the overhang length, wind speed, and wind direction were varied. The numerical results showed that the overhang drastically enhanced the ventilation rate in the windward direction regardless of the wind speed. This is because, for windward cases, the overhang produces a vortex with strong flow separation near the tip of the overhang, which promotes a net airflow exchange at the entrance and increases the ventilation rate. However, the ventilation rates for the leeward and side cases are slightly decreased with the overhang. Using an overhang with single-sided ventilation greatly reduces the local mean age of air (LMA) in the windward direction but increases it in the leeward direction.

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Computational analysis of the performance of a venturi-shaped roof for natural ventilation: Venturi-effect versus wind-blocking effect

Cited by 63 publications

References 33 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

CFD analysis of cross-ventilation of a generic isolated building with asymmetric opening positions: Impact of roof angle and opening location

Enhanced Single-Sided Ventilation with Overhang in Buildings

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