突发性危险化学品水污染扩散过程的模拟

Numerical simulation water pollution diffusions for sudden hazardous chemical

将突发性危险化学品水污染迁移扩散过程与自由水面流动联系起来,利用两相流理论建立三维瞬态自由水面流动的VOF压缩性模型。建立危化品迁移扩散的浓度压缩性模型,该模型能体现自由水面上水和空气相对速度对危化品迁移的作用。在VOF和危化品界面重构方法上采用高分辨率格式。数值模拟非淹没丁坝附近三维水流、岸边排放危化品和弯曲水槽中危化品扩散,模拟结果与试验结果及其它数值结果作了比较,表明本文建立的数学模型能准确地模拟水流三维特性突出的自由面、流场和危化品迁移扩散过程。

Sudden hazardous chemical water pollution diffusions contact with free surface flow in the paper. Based on two-phase flow theory, VOF compressive model for three dimensions transient free surface flow is deduced. A concentration compressive model for sudden hazardous chemical water pollution diffusion was represented. Transport action caused by relative velocity between water and air on free surface was explained in concentration compressive mode. A high resolution method was used for hazardous chemical interface reconstruction in VOF and concentration models. Numerical simulate 3D flow field affected non-submerged groyne, side hazardous chemical discharge and hazardous chemical dispersion in a meandering channel was carried out. The simulations were compared with experimental data or other published computations. The results mean that the compressive models proposed in this paper can accurately simulate free surface, flow field and hazardous chemical diffusions in 3D flow.