Effectiveness of RANS in predicting indoor airborne viral transmission: A critical evaluation against LES

Choudhary, K.; Krishnaprasad, K.A.; Pandey, Sudhanshu; Zgheib, Nadim; Salinas, Jorge S.; Ha, Man Yeong; Balachandar, S.

doi:10.1016/j.compfluid.2023.105845

Cited by 4 publications

(1 citation statement)

References 41 publications

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“…Numerical simulation methods save time and resources while improving efficiency (Guo et al , 2023; Zhou et al , 2023). RANS averages the control equations to avoid solving turbulent pulsations of various scales, reducing the calculation workload but also reducing calculation accuracy (Choudhary et al , 2023). LES directly solves large vortices using the N-S equation and uses a sub-grid model to consider the influence of small vortices (Gu et al , 2016).…”

Section: Introductionmentioning

confidence: 99%

The influence of vehicle body roll motion on aerodynamic characteristics under crosswind condition

Taiming,

Ma,

Zhang

et al. 2023

HFF

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Purpose The purpose of this study is investigate the transient aerodynamic characteristics of high-speed vehicle with body roll motion under crosswind condition to improve aerodynamic stability. Design/methodology/approach An overset mesh was used to simulate the rolling motion of the vehicle body. A wind tunnel experiment was conducted to validate the numerical method. Findings The results revealed that the vehicle’s aerodynamic characteristics changed periodically with the body’s periodic motion. In the absence of crosswind, the pressure distribution on the left and right sides of the vehicle body was symmetrical, and the speed streamline flowed to the rear of the vehicle in an orderly manner. The maximum aerodynamic lift observed in the transient simulation was −0.089, which is approximately 0.70 times that of the quasi-static simulation experiment. In addition, the maximum aerodynamic side force observed in the transient simulation was 0.654, which is approximately 1.25 times that of the quasi-static simulation experiment. Originality/value The aerodynamic load varies periodically with the vehicle body’s cyclic motion. However, the extreme values of the aerodynamic load do not occur when the vehicle body is at its highest or lowest position. This phenomenon is primarily attributed to the mutual interference of airflow viscosity and the hysteresis effect in the flow field, leading to the formation of a substantial vortex near the wheel. Consequently, the aerodynamic coefficient at each horizontal position becomes inconsistent during the periodic rolling of the vehicle body.

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Section: Introductionmentioning

confidence: 99%

The influence of vehicle body roll motion on aerodynamic characteristics under crosswind condition

Taiming,

Ma,

Zhang

et al. 2023

HFF

View full text Add to dashboard Cite

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Effect of room size, shape, AC placement, and air leakage on indoor airborne viral transmission

Choudhary,

Krishnaprasad,

Zgheib

et al. 2023

Building and Environment

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Numerical investigation of airborne infection risk in an elevator cabin under different ventilation designs

Nazari

Taghizadeh‐Hesary

2023

Physics of Fluids

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Airborne transmission of SARS-CoV-2 via virus-laden aerosols in enclosed spaces poses a significant concern. Elevators, commonly utilized enclosed spaces in modern tall buildings, present a challenge as the impact of varying heating, ventilation, and air conditioning (HVAC) systems on virus transmission within these cabins remains unclear. In this study, we employ computational modeling to examine aerosol transmission within an elevator cabin outfitted with diverse HVAC systems. Using a transport equation, we model aerosol concentration and assess infection risk distribution across passengers' breathing zones. We calculate the particle removal efficiency for each HVAC design and introduce a suppression effect criterion to evaluate the effectiveness of the HVAC systems. Our findings reveal that mixing ventilation, featuring both inlet and outlet at the ceiling, proves most efficient in reducing particle spread, achieving a maximum removal efficiency of 79.40% during the exposure time. Conversely, the stratum ventilation model attains a mere removal efficiency of 3.97%. These results underscore the importance of careful HVAC system selection in mitigating the risk of SARS-CoV-2 transmission within elevator cabins.

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Effectiveness of RANS in predicting indoor airborne viral transmission: A critical evaluation against LES

Cited by 4 publications

References 41 publications

The influence of vehicle body roll motion on aerodynamic characteristics under crosswind condition

The influence of vehicle body roll motion on aerodynamic characteristics under crosswind condition

Effect of room size, shape, AC placement, and air leakage on indoor airborne viral transmission

Numerical investigation of airborne infection risk in an elevator cabin under different ventilation designs

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