Hazardous gas risk assessment method based on CFD numerical simulation

The invention discloses a hazardous gas risk assessment method based on CFD numerical simulation. The hazardous gas risk assessment method comprises the following steps: establishing a model and setting a computational domain; assuming gas components and water mist; setting a physical model; carrying out grid division; setting boundary conditions and solver parameters; and carrying out CFD simulation calculation and visualization processing. The method has the advantages that risk assessment is carried out on the ammonia emergency emission diffusion range, the ammonia concentration and the ammonia water mist scattering range through CFD numerical simulation, and therefore an effective evaluation basis is provided for judging whether hazardous gas emission or leakage is safe or not. 本发明公开了一种基于CFD数值模拟的危险气体风险评估方法，包括如下步骤：模型建立及计算域设定；气体成分与水雾假设；物理模型设定；网格划分；边界条件及求解器参数设定；CFD模拟计算及可视化处理。本发明的优点在于通过CFD数值模拟对氨气应急排放扩散范围、氨气浓度和氨气水雾散落范围进行风险评估，从而为危险气体排放或泄露等是否安全提供了有效的评价依据。