Abstract
The lattice Boltzmann method (LBM) and large-eddy simulation (LES) are combined with a scalar subgrid-scale model to simulate the indoor air velocity field and harmful gas dispersion. The LBM-LES model is validated by comparing its results with published experimental and numerical simulation results. Taking a simplified chemical building as the scenario, the relative ventilation efficiency is evaluated based on the maximum harmful gas concentration, and configurations with centralized and distributed harmful gas sources with both mixing ventilation (MV) and displacement ventilation (DV) systems are considered. According to the results, if the density of the harmful gas is less than the air density, the DV system is more efficient than the MV system. The DV system is more stable than the MV system under fluctuating relative ventilation efficiency due to changes in the distance between the ventilation vents and in the distance between the centralized gas sources and the exhaust air vent.
Highlights
Indoor harmful gases seriously threaten human safety and health
Su et al.2 tested three large eddy simulation (LES) models [Smagorinsky subgrid-scale (SGS) model, dynamic SGS model, and stimulated SGS model] to simulate the indoor airflow with different ventilation systems and found that the dynamic and stimulated models perform slightly better than the Smagorinsky model
Min and Xu4 studied the structure of displacement ventilation (DV) convection with the Reynolds scitation.org/journal/adv averaged Navier–Stokes (RANS) equation and k-epsilon turbulence model
Summary
Indoor harmful gases seriously threaten human safety and health. Harmful gases emit from the indoor facilities into the air such as formaldehyde from the furniture in residential buildings and methane from chemical products in chemical buildings, and methane may even cause an explosion under certain conditions. Many researchers have studied indoor ventilation systems, harmful gas behavior, and air quality based on CFD methods. Li et al. proposed the multi-component LBM-LES model to simulate the air and methane flow in tunnels and validate their model by comparing with the Fluent results. To simulate the indoor harmful gas dispersion and airflow, the LBM model must have two abilities: the ability to simulate the turbulent flow and describe the multi-component flow. Considering that the large-scale simulation needs huge computing resources and the high Re turbulent flow requires high numerical stability, the LBM-LES model is combined with the scalar model to simulate the indoor harmful gas dispersion and airflow in this research. The aim of this study is to validate the applicability of the LBM-LES model combined with the scalar model in simulating the indoor airflow and harmful gas behavior first and taking.
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