Research On Oil Spill Numerical Simulation In Tidal Region Of Yangtze Rive Based On POM

The frequent occurrences of Marine oil spills with great impacts on the marine environment have been greatly concerned in the worldwide for a long time. However, shipping by rivers plays a prominent role increasingly with the rapid development of socioeconomics and technology in recent years, frequent river oil spills with the serious consequences drive people reexamine the once-neglected corner again.In this paper, Oil Spill happened in NanJing water area of Yangtze River was simulated deeply and comprehensively. Firstly, the three-dimensional numerical simulation of water flow is discussed: Based on POM, the turbulence control equations in body-fitted coordinate andσcoordinate were constructed from equations in Cartesian coordinate, then three-dimensional mathematical model was solved with mode-splitting solution technique and the results were applied to simulation of water flow in NanJing water area of Yangtze River .Secondly, the paper adopted oil particle model which was applied extensively to simulate the oil spill in NanJing water area of Yangtze River based on the numerical value of tidal water flow: this technique starts with physical phenomenon directly, which treats oil as a great deal of little oil drops when stimulating the transportation and the diffusion of oil spill in water, so it doesn't solve diffusion equation and it can recur many diffusive characters truly. In this technique, the convection of oil film can be obtained by tracking the trace of the particles, while the diffusive process which possesses randomicity could be simulated by random walk technique, that means oil particles' movements are very similar with molecule's irregular locomotion, all particles' diffusive movement reflects the random diffusive movement of oil film in macroscopic view; the evaporation, dissolution etc. can be externalized by mass loss of particles. The results obtained by this method are rational and reliable, which is significant in theory and practice to the clean-up and decision-making of the tidal River oil spill emergency.