The effect of barrier location on characteristics of gas pollutant transfer in the vicinity of highway

Lavruk, S. A.; Valger, S. A.

doi:10.1134/s0869864321030070

Cited by 1 publication

(2 citation statements)

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“…The study [22] described the isothermal case of a flow around a prism with a size ratio 2:1:1 fixed on a flat plate and found that the RANS approach underestimates the TKE level in zone -1, which leads to a significant overestimation of the longitudinal size of the separation zone behind the prism. In addition, application of this approach to assess pollutant dispersion around buildings is often difficult in terms of choosing semi-empirical constants of the turbulence model [34,35]. It was shown in [35] that the turbulent Schmidt number, Sct, has a large effect on the accuracy of predicting the pollutant transport and there is no universal values for the problems of buildings aerodynamics, where a complex interference of atmospheric flow and local flows forming around building is observed.…”

Section: Turbulence Model Validationmentioning

confidence: 99%

“…In addition, application of this approach to assess pollutant dispersion around buildings is often difficult in terms of choosing semi-empirical constants of the turbulence model [34,35]. It was shown in [35] that the turbulent Schmidt number, Sct, has a large effect on the accuracy of predicting the pollutant transport and there is no universal values for the problems of buildings aerodynamics, where a complex interference of atmospheric flow and local flows forming around building is observed. In our calcualtions, the turbulent Schmidt number Sct = 0.7 is set, which is used by default in FLUENT for a wide range of problems.…”

Section: Turbulence Model Validationmentioning

confidence: 99%

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Estimation of pollutant dispersion around a building within non-isothermal boundary-layer using detached eddy simulation

Valger

2022

Therm sci

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The paper presents the numerical results of modelling pollutant transport from a low source behind a bluff-body imitating a building within a non-isothermal boundary layer. The main goal of the study is to estimate the tracer gas dispersion in a complex turbulent separated flow behind a building in the presence of interference of the atmospheric boundary layer and local flows. In the fist part of the study we compare numerical approaches URANS and IDDES for turbulent flow prediction on a configuration for which experimental data are available. It is shown that Detached Eddy Simulation approach predicts correctly the main separated flow features and demonstrates a reliable correlation with the experimental data on mean velocity, pollutant concentration and temperature fields. In the second part of the study, the influence of unstable thermal stratified flow on the tracer gas transport around a building is analyzed using IDDES method. The unstable thermal flow regime considered in the study affects the distribution of the pollutant concentration in the recirculation zone behind the building. The presence of additional buoyancy effects leads to an increase in the gas concentration on the leeward wall of the body and gas transport from a ground region to a height greater than in the case with the neutral boundary layer.

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