CFD boundary conditions for contaminant dispersion, heat transfer and airflow simulations around human occupants in indoor environments

Srebric, Jelena; Vuković, Vladimir; He, Guoqing; Yang, Xudong

doi:10.1016/j.buildenv.2006.03.023

Cited by 136 publications

(68 citation statements)

References 6 publications

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“…Grid density and construction has been shown to influence flow results heavily [32,35,37,38] therefore a mesh independence study was first undertaken for the empty room scenario.…”

Section: Grid Sensitivitymentioning

confidence: 99%

Bioaerosol deposition in single and two-bed hospital rooms: A numerical and experimental study

King

Noakes

Sleigh

et al. 2013

Building and Environment

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Abstract:Aerial dispersion of pathogenic microorganisms and subsequent contamination of surfaces is well recognised as a potential transmission route for hospital acquired infection. Simulation approaches such as computational fluid dynamics (CFD) are increasingly used to model Results for all layouts demonstrate that small particle bioaerosols are deposited throughout a room with no clear correlation between relative surface concentration and distance from the source. However, a physical partition separating patients is shown to be effective at reducing cross-contamination of neighbouring patient zones.

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“…Grid density and construction has been shown to influence flow results heavily [32,35,37,38] therefore a mesh independence study was first undertaken for the empty room scenario.…”

Section: Grid Sensitivitymentioning

confidence: 99%

Bioaerosol deposition in single and two-bed hospital rooms: A numerical and experimental study

King

Noakes

Sleigh

et al. 2013

Building and Environment

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“…The heat flux generated by people was taken as 60 W/m 2 for the seated person [25]. The convective and radiative heat fluxes from the people were set to 18 W/m 2 and 42 W/m 2 respectively (recommended convection to radiation ratio of 30:70 [36]). The laptops generated 131 W of electrical power each (it was assumed that all generated electrical power was transformed into heat).…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…The heat flux generated by people was taken as 60 W/m 2 for the seated person [25]. It was assumed the heat from the people was transferred through convection (PerHeat) and radiation (PerRad) with a C:R ratio of 30:70 [36]. The ranges of the convective and radiative heat fluxes were specified as the average values ± 20%.…”

Section: Parametric Analysismentioning

confidence: 99%

Calibrated CFD simulation to evaluate thermal comfort in a highly-glazed naturally ventilated room

Hajdukiewicz

Geron

Keane

2013

Building and Environment

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“…There are a large number of studies dealing with indoor environment with the use of CFD available from literature, see e.g. Srebric et al (2008), Chen and Wen (2010) and Liu et al (2010).…”

Section: Methodsmentioning

confidence: 99%

Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment

Chen¹

2014

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A well-functioning, energy-efficient ventilation system is of vital importance to offices, not only to provide the kind of comfortable, healthy indoor environment necessary for the well-being and productive work performance of occupants, but also to reduce energy use in buildings and the associated impact of CO 2 emissions on the environment. To achieve these goals impinging jet ventilation has been developed as an innovative ventilation concept.In an impinging jet ventilation system, a high momentum of air jet is discharged downwards, strikes the floor and spreads over it, thus distributing the fresh air along the floor in the form of a very thin shear layer. This system retains advantages of mixing and stratification from conventional air distribution methods, while capable of overcoming their shortcomings.The aim of this thesis is to reach a thorough understanding of impinging jet ventilation for providing a good thermal environment for an office, by using Computational Fluid Dynamics (CFD) supported by detailed measurements. The full-field measurements were carried out in two test rooms located in a large enclosure giving relatively stable climate conditions. This study has been divided into three parts where the first focuses on validation of numerical investigations against measurements, the second addresses impacts of a number of design parameters on the impinging jet flow field and thermal comfort level, and the third compares ventilation performance of the impinging jet supply device with other air supply devices intended for mixing, wall confluent jets and displacement ventilation, under specific room conditions. In the first part, velocity and temperature distributions of the impinging jet flow field predicted by different turbulence models are compared with detailed measurements. Results from the non-isothermal validation studies show that the accuracy of the simulation results is to a great extent dependent on the complexity of the turbulence models, due to complicated flow phenomena related to jet impingement, such as recirculation, curvature and instability. The f v  2 turbulence model shows the best performance with measurements, which is slightly better than the SST k-ω model but much better than the RNG k-ε model. The difference is assumed to be essentially related to the magnitude of turbulent kinetic energy predicted in the vicinity of the stagnation region. Results from the isothermal study show that both the SST k-ω and RNG k-ε models predict similar wall jet behaviours of the impinging jet flow. IVIn the second part, three sets of parametric studies were carried out by using validated CFD models. The first parametric study shows that the geometry of the air supply system has the most significant impact on the flow field. The rectangular air supply device, especially the one with larger aspect ratio, provides a longer penetration distance to the room, which is suitable for industrial ventilation. The second study reveals that the interaction effect of cooling ceiling, heat sources ...

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CFD boundary conditions for contaminant dispersion, heat transfer and airflow simulations around human occupants in indoor environments

Cited by 136 publications

References 6 publications

Bioaerosol deposition in single and two-bed hospital rooms: A numerical and experimental study

Bioaerosol deposition in single and two-bed hospital rooms: A numerical and experimental study

Calibrated CFD simulation to evaluate thermal comfort in a highly-glazed naturally ventilated room

Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment

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