Overview of pressure coefficient data in building energy simulation and airflow network programs

Cóstola, D Daniel; Blocken, Bje Bert; Hensen, Jlm Jan

doi:10.1016/j.buildenv.2009.02.006

Cited by 172 publications

(108 citation statements)

References 29 publications

(3 reference statements)

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“…[6,7,9,10,13,[19][20][21][22][23][24][25][26][27][28][29]), analytical and/or semiempirical formulae (e.g. [9][10][11]13,15,[30][31][32][33][34]), simulations with zonal and multizone network models (e.g. [35][36][37][38]) and Computational Fluid Dynamics (CFD) models (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

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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

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450

271

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“…al (2009) [6]. Majority of these simulation program, however, using average Cp value, which means there is only one Cp value for each surface of the building envelope, instead of distributed or local Cp.…”

Section: Importance Of Wind Direction and Wind Pressure On Infiltratimentioning

confidence: 99%

“…However there are several challenges in using CFD to determine Cp value, which are include numerical accuracy, boundary condition, and turbulence models (Stathopoulos, 1997 in Cóstola, et. al, 2009) [6].…”

Section: (5)mentioning

confidence: 99%

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Enhanced wind-driven infiltration model by incorporating wind direction for design purpose

Perdamaian

Zhai

2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract.Research has been conducted to improve and enhance existing LBNL infiltration model in order to incorporate wind direction effect on flow rate. Existing wind driven infiltration of LBNL model only consider terrain and shielding parameter as correction factor. Supplemental analytical model considered in this research was Swami-Chandra model, which the calculation was based on average wind pressure coefficient (Cp). It was evident that for same wind direction, Cp value will not change regardless of wind velocity. Process of simulation shows that infiltration modelling has to be performed in three-dimensional environment with transient calculation in order to achieve convergent result. Wind direction strongly affects infiltration flow rate. However, as the infiltration hole has relatively small size compared to wind velocity, flow rate variation is marginal for energy-based design. Nevertheless, for pollutant and particulate matter analysis, wind direction will give significant change in term of concentration and flow direction. IntroductionBoth infiltration and ventilation are vital in determining the indoor air quality. Ventilation, both mechanical and natural are most likely controlled either automatically or manually. Meanwhile, infiltration is unintentional and can introduce unwanted contaminants from outside and either hot air from the outside that increasing cooling load or bring cold air inside and increase the heating load. Study of infiltration has been conducted in decades and researcher has developed many kinds of infiltration model. However, the nature of airflow is very difficult to predict and model, because of the uncertainty in turbulence, vortex, and flow separation, for example. Therefore, from design purpose, the model is highly practical to use but prone to error and inaccuracies. An alternative to those analytical model is using computational fluid dynamics. Usage of CFD has increased along with the improvement of computing capabilities. CFD can model varieties of fluid flow with many physical parameter, therefore better result can be achieved.

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“…[4][5][6]); (2) analytical and/or semi-empirical formulae (e.g. [4,[7][8][9]); (3) full-scale measurements (e.g. [10][11][12][13]); (4) reduced-scale atmospheric boundary layer wind tunnel experiments (e.g.…”

Section: Introductionmentioning

confidence: 99%

A venturi-shaped roof for wind-induced natural ventilation of buildings: Wind tunnel and CFD evaluation of different design configurations

Hooff

Blocken

Aanen³

et al. 2011

Building and Environment

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111

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Wind tunnel experiments and Computational Fluid Dynamics (CFD) are used to analyse the flow conditions in a venturi-shaped roof, with focus on the underpressure in the narrowest roof section (contraction). This underpressure can be used to partly or completely drive the natural ventilation of the building zones. The wind tunnel experiments are performed in an atmospheric boundary layer wind tunnel at scale 1:100. The 3D CFD simulations are performed with steady RANS and the RNG k-ε model. The purpose of this study is twofold:(1) to evaluate the accuracy of steady RANS and the RNG k-ε model for this application and (2) to assess the magnitude of the underpressures generated with different design configurations of the venturi-shaped roof. The CFD simulations of mean wind speed and surface pressures inside the roof are generally in good agreement (10-20%) with the wind tunnel measurements. The study shows that for the configuration without guiding vanes, large negative pressure coefficients are obtained, down to -1.35, with reference to the freestream wind speed at roof height. The comparison of design configurations with and without guiding vanes shows an -at least at first sight -counter-intuitive result: adding guiding vanes strongly decreases the absolute value of the underpressure. The reason is that the presence of the guiding vanes increases the flow resistance inside the roof and causes more wind to flow over and around the roof, and less wind through it (wind-blocking). As a result, the optimum configuration is the one without guiding vanes.

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Overview of pressure coefficient data in building energy simulation and airflow network programs

Cited by 172 publications

References 29 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

Enhanced wind-driven infiltration model by incorporating wind direction for design purpose

A venturi-shaped roof for wind-induced natural ventilation of buildings: Wind tunnel and CFD evaluation of different design configurations

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