弯道明渠内危化品泄漏扩散的数值模拟

自由水面流动和危化品水体迁移扩散过程属有界性问题,利用两相流理论建立三维瞬态VOF动力学模型,在其基础上提出危化品水体迁移扩散的浓度压缩性微分方程,有限容积法离散方程,高分辨率Gamma离散格式适用于解决有界性问题,用Gamma格式离散VOF和危化品迁移扩散方程的对流项。对Chang实验的弯曲水槽的流动及危化品扩散进行数值模拟,模拟结果与实验结果较吻合。笔者建立的数学模型能准确地模拟水流三维特性突出的弯道水槽的流场和危化品水体迁移扩散过程。

Numerical Simulation for Hazardous Chemical Diffusions in Meandering Channel

Free surface flow and hazardous chemical diffusions are bounded problems. Based on two-phase flow theory, VOF dynamical model for three dimensions transient free surface flow and a concentration compressive model for pollutant diffusion are represented. Finite volume method is used for discrete equations, and Gamma scheme can tackle the problem of boundedness. Gamma scheme is used for convection term in VOF and concentration equations. The flow and hazardous chemical diffusions in meandering channel used by Chang's experiments are simulated. The simulation results agree very well with the experimental results. The models proposed in this paper can accurately simulate flow field and pollutant diffusion in 3-dimensional natural waters flow.