污染物在水中扩散的MPS数值模拟

In this paper, a concentration diffusion model based on MPS algorithm is established, which can simulate the diffusion and mass transfer process of solute under the action of concentration gradient. The Fick's second law is added to MPS method to realize the simulation of molecular diffusion between substances, and the accuracy of the model is verified by comparison with the analytical solution. Subsequently, the diffusion process of concentration in media with different diffusion coefficients is further studied. Then, a multiphase MPS model is added to the MPS method, and the accuracy of the model is verified by simulating the Poiseuille flow. Finally, the leakage and diffusion process of pollutants in water are studied. By adding diffusion model and multiphase model, the flow and diffusion process of pollutants with different densities in water are simulated.