In this study, Monin–Obukhov similarity theory is used to specify the profiles of velocity, turbulent kinetic energy ( k ), and eddy dissipation rate ( $$\epsilon$$ ϵ ) in atmospheric boundary layer (ABL) flow. The OpenFOAM standard solver buoyantSimpleFoam is modified to simulate neutrally stratified ABL. The solver is able to obtain equilibrium ABL. For gas dispersion simulation, buoyantNonReactingFoam is developed to take into account fluid properties change due to temperature, buoyancy effect, and variable turbulent Schmidt number. The solver is validated for dense gas dispersion in wind tunnel test and field test of liquefied natural gas vapour dispersion in neutrally stratified ABL.

中文翻译：

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使用 OpenFOAM 对中性大气边界层中的稠密气体扩散进行 CFD 模拟

在本研究中，Monin-Obukhov 相似理论用于指定大气边界层 (ABL) 流中的速度、湍动能 (k) 和涡流耗散率 ($\epsilon$$ϵ) 的剖面。OpenFOAM 标准求解器 buoyantSimpleFoam 被修改为模拟中性分层 ABL。求解器能够获得平衡 ABL。对于气体扩散模拟，开发了 buoyantNonReactingFoam 以考虑由于温度、浮力效应和可变湍流施密特数引起的流体特性变化。该求解器在风洞试验和中性分层 ABL 中液化天然气蒸汽扩散的现场试验中验证了稠密气体扩散。