We developed an innovative tool to support the simulation of gas dispersion from liquefied natural gas pools in presence of obstacles. For the first time, the systematic evaluation of the influence of atmospheric stability conditions and the variation of the source term on congested dispersion scenarios is carried out, coupling integral models and computational fluid dynamics (CFD). The atmospheric boundary layer is implemented in the CFD together with ad-hoc boundary conditions, aimed at reproducing the dynamic pool spreading and consequent vaporization, simulated through integral models. A preliminary comparison is done between the results given by CFD and literature integral dispersion models in an open field case; subsequently, the presence of a perimeter wall is analyzed through the CFD technique. The results show a good agreement between the CFD and the integral models in the open field configuration, even though an overprediction of methane concentration is underlined for the integral model. In the case of the obstacle, CFD permits a precise analysis of the flow-field in all the considered atmospheric conditions and a deep investigation of the effects of the wall on the methane concentration.

我们开发了一种创新工具来支持在存在障碍物的情况下模拟液化天然气池中的气体扩散。第一次，结合积分模型和计算流体动力学（CFD），系统地评估了大气稳定条件和源项的变化对拥挤弥散场景的影响。CFD中将大气边界层与临时边界条件一起实施，目的是通过积分模型模拟动态池扩散和随之产生的气化。在开场情况下，CFD给出的结果与文献积分色散模型之间进行了初步比较；随后，通过CFD技术分析周边墙的存在。结果表明，即使在积分模型中强调了甲烷浓度的过高预测，在开放现场配置中，CFD和积分模型之间也有很好的一致性。在有障碍物的情况下，CFD可以对所有考虑的大气条件下的流场进行精确分析，并可以深入研究壁对甲烷浓度的影响。