Evaluating the influence of turbulence models used in computational fluid dynamics for the prediction of airflows inside poultry houses

Küçüktopcu, Erdem; Cemek, Bilal

doi:10.1016/j.biosystemseng.2019.04.009

Cited by 27 publications

(16 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Relatively larger discrepancies were found near the fan area, where lower air temperatures were expected. In the summer, 13 out of 57 values were higher than or equal to −5% or 5%, which were also similar to previous reports [ 27 , 47 ].…”

Section: Resultssupporting

confidence: 92%

“…The SIMPLE algorithm with second-order precision was selected. The renormalization group (RNG) k-ε turbulence model was used to predict the indoor environment of broiler housing because it has been suggested to be more accurate than standard k-ε and realizable k-ε turbulence models [ 27 ]. The convergence criterion was fixed to 10 −4 for the continuity, momentum, and turbulence equations and 10 −6 for the energy equation.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, CFD has gained popularity in recent years as a result of technological advances. The method has been successfully applied in a wide variety of industrial fields, such as aerospace [ 19 , 20 ], automotive [ 21 , 22 ], and agriculture [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. These studies have contributed significantly to our understanding; however, no previous studies have sufficiently assessed the indoor environment of mechanically ventilated broiler buildings in different breeding seasons (summer and winter).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Computational Fluid Dynamics Modeling of a Broiler House Microclimate in Summer and Winter

Küçüktopcu

Cemek

Simsek

et al. 2022

Animals

Self Cite

View full text Add to dashboard Cite

Appropriate microclimate conditions in broiler housing are critical for optimizing poultry production and ensuring the health and welfare of the birds. In this study, spatial variabilities of the microclimate in summer and winter seasons in a mechanically ventilated broiler house were modeled using the computational fluid dynamics (CFD) technique. Field measurements of temperature, relative humidity, and airspeeds were conducted in the house to compare the simulated results. The study identified two problems of high temperature in summer, which could result in bird heat stress and stagnant zones in winter, and simulated possible alternative solutions. In summer, if an evaporative cooling pad system was used, a decrease in temperature of approximately 3 °C could be achieved when the mean air temperature rose above 25 °C in the house. In winter, adding four 500-mm circulation fans of 20-m spacing inside the house could eliminate the accumulation of hot and humid air in the stagnant zones in the house. This study demonstrated that CFD is a valuable tool for adequate heating, ventilation, and air conditioning system design in poultry buildings.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Computational Fluid Dynamics Modeling of a Broiler House Microclimate in Summer and Winter

Küçüktopcu

Cemek

Simsek

et al. 2022

Animals

Self Cite

View full text Add to dashboard Cite

show abstract

“…(3) . The RNG k–ε turbulence model performs well in simulating indoor airflow with a low-Reynolds-number two-equation model; thus, it has been widely used ( Küçüktopcu and Cemek, 2019 ; Kwon et al, 2015 ). In this study, the airflow of a dental clinic with a low-velocity air supply belongs to a low-Reynolds-number flow; thus, the RNG k–ε model was adopted.…”

Section: Methodsmentioning

confidence: 99%

Estimating the restraint of SARS-CoV-2 spread using a conventional medical air-cleaning device: Based on an experiment in a typical dental clinical setting

Liu

Zhang

Liu

et al. 2023

International Journal of Hygiene and Environmental Health

View full text Add to dashboard Cite

“…The renormalization group (RNG) k–ε turbulence model in the RANS method is widely used in indoor airflow simulations and has proven effective within the RANS turbulence models [ 27 ]. The RNG k–ε model is one of the best turbulence models compared with those of other RANS methods, especially with respect to accuracy, computational speed, and stability of indoor environment modeling [ 28 , 29 ]. Therefore, the RNG k–ε turbulence model was adopted in this study.…”

Section: Cfd Methodologymentioning

confidence: 99%

Full-scale experimental and numerical study of bioaerosol characteristics against cross-infection in a two-bed hospital ward

Liu

Wang

Rong

et al. 2020

Building and Environment

View full text Add to dashboard Cite

The transmission and deposition of pathogenic bioaerosols and the subsequent contamination of the air and surfaces is well recognized as a potential route of hospital cross-infection. A full-scale experiment using Bacillus subtilis and computational fluid dynamics were utilized to model the bioaerosol characteristics in a two-bed hospital ward with a constant air change rate (12 ACH). The results indicated that the bioaerosol removal efficiency of unilateral downward ventilation was 50% higher than that of bilateral downward ventilation. Additionally, health care workers (HCWs) and nearby patients had lower breathing zone concentrations in the ward with unilateral downward ventilation. Furthermore, a partition played a positive role in protecting patients by reducing the amount of bioaerosol exposure. However, no obvious protective effect was observed with respect to the HCWs. Only 10% of the bioaerosol was deposited on the surfaces in the ward with unilateral downward ventilation, while up to 35% of the bioaerosol was deposited on the surfaces in the ward with bilateral downward ventilation during the 900 s. The main deposition locations of the bioaerosols were near the wall on the same side of the room as the patient's head in all cases. This study could provide scientific evidence for controlling cross-infection in hospital wards, as well as several guidelines for the disinfection of hospital wards.

show abstract

Evaluating the influence of turbulence models used in computational fluid dynamics for the prediction of airflows inside poultry houses

Cited by 27 publications

References 28 publications

Computational Fluid Dynamics Modeling of a Broiler House Microclimate in Summer and Winter

Computational Fluid Dynamics Modeling of a Broiler House Microclimate in Summer and Winter

Estimating the restraint of SARS-CoV-2 spread using a conventional medical air-cleaning device: Based on an experiment in a typical dental clinical setting

Full-scale experimental and numerical study of bioaerosol characteristics against cross-infection in a two-bed hospital ward

Contact Info

Product

Resources

About