Flow field in the wake of a bluff body driven through a steady recirculating flow

Poussou, Stephane B.; Plesniak, Michael W.

doi:10.1007/s00348-015-1910-1

Cited by 7 publications

(1 citation statement)

References 51 publications

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“…Experimental studies examined the motioninduced wake patterns and their effects on contaminant distribution. [18][19][20][21] Compared to experimental studies, computational fluid dynamics (CFD) approaches have become more popular in studying indoor air flows, 22,23 human-induced wake flow 24 and indoor airborne particle dispersion, 25,26 owing to advantages of low-cost and powerful visualization capabilities. CFD methods have been able to predict qualitatively the wake flow characteristics induced by obstacle motion, 27 the human-induced airflow and contaminant transport.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics study of human-induced wake and particle dispersion in indoor environment

Tao

Inthavong

2016

Indoor and Built Environment

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The impact of human-induced wake flow and particle re-dispersion from floors in an indoor environment was investigated by performing computational fluid dynamics simulations with dynamic mesh of a moving manikin model in a confined room. The manikin motion was achieved by a dynamic layering mesh method to update new grids with each time step. Particle transport from the floors and its redispersion was tracked by a Lagrangian approach. A series of numerical simulations of three walking speeds were performed to compare the flow disturbance induced by the walking motion. The significant airflow patterns included: an upward-directed flow in front of the body combined with a high velocity downward-directed flow at the rear of the body; a stagnant region behind the gap between the legs and counter-rotating vortices in the wake region. The airflow momentum induced by the moving body disturbed PM 2.5 particles that were initially at rest on the floor to lift and become re-suspended due to its interaction with the trailing wake. The residual flow disturbances after the manikin stopped moving continued to induce the particle to spread and deposit over time. The spatial and temporal characteristics of the particle dispersion and concentration showed that higher walking speed was conducive to reducing human's exposure to contaminants in breathing region.

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Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics study of human-induced wake and particle dispersion in indoor environment

Tao

Inthavong

2016

Indoor and Built Environment

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Airflow patterns through single hinged and sliding doors in hospital isolation rooms – Effect of ventilation, flow differential and passage

Kalliomäki

Saarinen

Tang

et al. 2016

Building and Environment

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a b s t r a c tNegative pressure isolation rooms are used to house patients with highly contagious diseases (e.g. with airborne diseases) and to contain emitted pathogens to reduce the risk for cross-infection in hospitals. Airflows induced by door opening motion and healthcare worker passage can, however, transport the potentially pathogen laden air across the doorway. In this study airflow patterns across the isolation room doorway induced by the operation of single hinged and sliding doors with simulated human passage were examined. Smoke visualizations demonstrated that the hinged door opening generated a greater flow across the doorway than the sliding door. Tracer gas measurements showed that the examined ventilation rates (6 and 12 air changes per hour) had only a small effect on the air volume exchange across the doorway with the hinged door. The results were more variable with the sliding door. Supply-exhaust flow rate differential reduced the door motion-induced air transfer significantly with both door types. The experiments showed that the passage induced substantial air volume transport through the doorway with both door types. However, overall, the sliding door performed better in all tested scenarios, because the door-opening motion itself generated relatively smaller air volume exchange across the doorway, and hence should be the preferred choice in the design of isolation rooms.

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Experimental visualisation of wake flows induced by different shaped moving manikins

Tao

Inthavong

Petersen

et al. 2018

Building and Environment

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Flow field in the wake of a bluff body driven through a steady recirculating flow

Cited by 7 publications

References 51 publications

Computational fluid dynamics study of human-induced wake and particle dispersion in indoor environment

Computational fluid dynamics study of human-induced wake and particle dispersion in indoor environment

Airflow patterns through single hinged and sliding doors in hospital isolation rooms – Effect of ventilation, flow differential and passage

Experimental visualisation of wake flows induced by different shaped moving manikins

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