A Diffusion-Inertia Model for the simulation of particulate pollutants dynamics inside a car cabin

Djeddou, Mokhtar; Mehel, Amine; Fokoua, Georges; Tanière, Anne; Chevrier, Patrick

doi:10.1016/j.jaerosci.2023.106279

Cited by 2 publications

(1 citation statement)

References 58 publications

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“…Additionally, studies are carried out on air humidity, oxygen, and carbon dioxide concentrations [17][18][19][20]. Much attention is also paid to studying the movement of pollutants and pathogens [21][22][23][24]. It is known that optimizing the parameters of the climate control system affects not only the creation of comfortable conditions but also the overall energy efficiency of the vehicle.…”

Section: Introductionmentioning

confidence: 99%

Improving the Energy Efficiency of Vehicles by Ensuring the Optimal Value of Excess Pressure in the Cabin Depending on the Travel Speed

Panfilov,

Beskopylny,

Meskhi

2024

Fluids

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This work is devoted to the study of gas-dynamic processes in the operation of climate control systems in the cabins of vehicles (HVAC), focusing on pressure values. This research examines the issue of assessing the required values of air overpressure inside the locomotive cabin, which is necessary to prevent gas exchange between the interior of the cabin and the outside air through leaks in the cabin, including protection against the penetration of harmful substances. The pressure boost in the cabin depends, among other things, on the external air pressure on the locomotive body, the power of the climate system fan, and the ratio of the input and output deflectors. To determine the external air pressure, the problem of train movement in a wind tunnel is considered, the internal and external fluids domain is considered, and the air pressure on the cabin skin is determined using numerical methods CFD based on the Navier–Stokes equations, depending on the speed of movement. The finite-volume modeling package Ansys CFD (Fluent) was used as an implementation. The values of excess internal pressure, which ensures the operation of the climate system under different operating modes, were studied numerically and on the basis of an approximate applied formula. In particular, studies were carried out depending on the speed and movement of transport, on the airflow of the climate system, and on the ratio of the areas of input and output parameters. During a numerical experiment, it was found that for a train speed of 100 km/h, the required excess pressure is 560 kPa, and the most energy-efficient way to increase pressure is to regulate the area of the outlet valves.

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Section: Introductionmentioning

confidence: 99%

Improving the Energy Efficiency of Vehicles by Ensuring the Optimal Value of Excess Pressure in the Cabin Depending on the Travel Speed

Panfilov,

Beskopylny,

Meskhi

2024

Fluids

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On the effectiveness of Reynolds-averaged and subgrid scale models in predicting flows inside car cabins

Grossi,

Arpino,

Bertone

et al. 2024

Physics of Fluids

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The aim of the present study is to analyze the performances of unsteady Reynolds-averaged Navier–Stokes (URANS) and large eddy simulation (LES) approaches in predicting the airflow patterns inside car cabins and to give insight in the design of computational fluid dynamics simulations of a real car cabin. For this purpose, one eddy viscosity-based turbulence model (shear stress transport k–ω) and two subgrid scale models (wall-adapting local eddy-viscosity and dynamic kinetic energy) were tested, and numerical results were compared with particle image velocimetry measurements carried out on a commercial car. The URANS model exhibited great accuracy in predicting the mean flow behavior and was appreciably outperformed by the LES models only far from the inlet sections. For this reason, it was deemed suitable for conducting further analyses, aimed at characterizing the airflow patterns in winter and summer conditions and performing a thermal comfort analysis. The thermal regime was found to have a very little effect on the air flow patterns, once the quasi-steady state regime is achieved; in fact, both in winter and in summer, the temperature field is fairly uniform within the car cabin, making the contribution of buoyancy negligible and velocity fields to be very similar in the two seasons. Findings also reveal that thermal comfort sensation can be different for passengers sharing the same car but sitting on different seats; this aspect should be considered when designing and operating the ventilation system, since the minimum comfort requirements should be met for all the occupants.

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A Diffusion-Inertia Model for the simulation of particulate pollutants dynamics inside a car cabin

Cited by 2 publications

References 58 publications

Improving the Energy Efficiency of Vehicles by Ensuring the Optimal Value of Excess Pressure in the Cabin Depending on the Travel Speed

Improving the Energy Efficiency of Vehicles by Ensuring the Optimal Value of Excess Pressure in the Cabin Depending on the Travel Speed

On the effectiveness of Reynolds-averaged and subgrid scale models in predicting flows inside car cabins

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