Enhancing Computational Modelling of Atmospheric Boundary Layers: Sustaining Realistic Turbulence and Wind Profiles for Gas Dispersion

Accurate representation of the atmospheric boundary layer (ABL) is essential for computational studies involving wind engineering, pollutant dispersion, and thermally stratified flows. This study implemented a modified 𝑘−𝜀 turbulence model in OpenFOAM to simulate the ABL under stable and neutral conditions. The approach incorporates a revised formulation for the buoyancy related constant, 𝐶𝜀3, and inlet profiles derived from Monin–Obukhov similarity theory. Results indicated that horizontal homogeneity was well preserved across the domain, with realistic vertical profiles of mean velocity, temperature, and turbulence parameters. Minor deviations observed near the top of the domain under stable conditions suggest that further refinement is necessary.