Modeling of air inlets in CFD prediction of airflow in ventilated animal houses

Bjerg, Bjarne; Svidt, Kjeld; Zhang, G.; Morsing, S.; Johnsen, J.O.

doi:10.1016/s0168-1699(01)00189-2

Cited by 56 publications

(20 citation statements)

References 7 publications

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“…This building geometry was modelled in its real dimensions. The exhaust fans were modelled as circles 1.28 m in diameter and the twelve inlets were accurately modelled in the form adopted in each scenario as in similar studies [7,11,31].…”

Section: Geometry Mesh and Bcmentioning

confidence: 99%

Measurement and Numerical Simulation of Air Velocity in a Tunnel-Ventilated Broiler House

et al. 2015

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Abstract:A building needs to be designed for the whole period of its useful life according to its requirements. However, future climate predictions involve some uncertainty. Thus, several sustainable strategies of adaptation need to be incorporated after the initial design. In this sense, tunnel ventilation in broiler houses provides high air velocity values (2-3 m·s) at animal level to diminish their thermal stress and associated mortality. This ventilation system was experimentally incorporated into a Mediterranean climate. The aim was to resolve these thermal problems in hot seasons, as (traditional) cross-mechanical ventilation does not provide enough air velocity values. Surprisingly, very little information on tunnel ventilation systems is available, especially in terms of air velocity. Using Computational Fluid Dynamics (CFD) and a multi-sensor system, the average results are similar (at animal level: 1.59 ± 0.68 m·s for measurements). The ANOVA for validation concluded that the use of CFD or measurements is not significant (p-value = 0.1155). Nevertheless, some problems with air velocity distribution were found and need to be solved. To this end, CFD techniques can help by means of virtual designs and scenarios providing information for the whole indoor space.

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Section: Geometry Mesh and Bcmentioning

confidence: 99%

Measurement and Numerical Simulation of Air Velocity in a Tunnel-Ventilated Broiler House

et al. 2015

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“…These air velocity at inlets (m s −1 ) were obtained from thirty measurements (thirty seconds) at each inlet by means of a calibrated Testo 425 hot-wire anemometer [28]; then, the average of all inlets was calculated and introduced in CFD software. Introducing these single values reduces time consumption of CFD calculations; in this sense, some authors have calculated and assumed uniform velocities and airflow rates for inlets or outlets in their CFD simulations [18,29,30]. In this paper, the individual ventilation rate of each outlet was measured by [27].…”

Section: Turbulence Models and Boundary Conditions (Bc)mentioning

confidence: 99%

Exploring Ventilation Efficiency in Poultry Buildings: The Validation of Computational Fluid Dynamics (CFD) in a Cross-Mechanically Ventilated Broiler Farm

et al. 2013

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Broiler production in modern poultry farms commonly uses mechanical ventilation systems. This mechanical ventilation requires an amount of electric energy and a high level of investment in technology. Nevertheless, broiler production is affected by periodic problems of mortality because of thermal stress, thus being crucial to explore the ventilation efficiency. In this article, we analyze a cross-mechanical ventilation system focusing on air velocity distribution. In this way, two methodologies were used to explore indoor environment in livestock buildings: Computational Fluid Dynamics (CFD) simulations and direct measurements for verification and validation (V&V) of CFD. In this study, a validation model using a Generalized Linear Model (GLM) was conducted to compare these methodologies. The results showed that both methodologies were similar in results: the average of air velocities values were 0.60 ± 0.56 m s for direct measurements. In conclusion, the air velocity was not affected OPEN ACCESSEnergies 2013, 6 2606 by the methodology (CFD or direct measurements), and the CFD simulations were therefore validated to analyze indoor environment of poultry farms and its operations. A better knowledge of the indoor environment may contribute to reduce the demand of electric energy, increasing benefits and improving the thermal comfort of broilers.

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“…It is intriguing to highlight that the prediction of the airflows can be practically used to effectively design the ventilation systems in order to maximize energy efficiency, to ensure high quality products and to reduce operating costs. Prediction methods, based on computational fluid dynamics (CFD) simulations, have already been successfully adopted for ventilation in greenhouses (Jiménez-Hornero et al, 2006;Bournet and Boulard, 2010;Boulard et al, 2010;Molina-Aiz et al, 2010), livestock (Bjerg et al, 2002), food-industry (Xia and Sun, 2002;Norton, 2013). Possible applications of CFD simulations in agricultural and environmental contexts have been underlined in Lee et al (2013), while the usage of CFD for bioenergy and biomass has been highlighted in Bartzanas et al (2013) and Wu (2013).…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of the airflows in a wine-aging room: A lattice Boltzmann-Immersed Boundary study

Rosis

Barbaresi

Torreggiani

et al. 2014

Computers and Electronics in Agriculture

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Modeling of air inlets in CFD prediction of airflow in ventilated animal houses

Cited by 56 publications

References 7 publications

Measurement and Numerical Simulation of Air Velocity in a Tunnel-Ventilated Broiler House

Measurement and Numerical Simulation of Air Velocity in a Tunnel-Ventilated Broiler House

Exploring Ventilation Efficiency in Poultry Buildings: The Validation of Computational Fluid Dynamics (CFD) in a Cross-Mechanically Ventilated Broiler Farm

Numerical simulations of the airflows in a wine-aging room: A lattice Boltzmann-Immersed Boundary study

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