Abstract: The new contamination model of batch transportation based on the k turbulent model is established. Numerical Simulation for the concentration distribution of contamination before and after shutdown to Batch Pipeline is conducted with the help of PHOENICS. The result is given by curves and pictures. The computation results shows that the effect of density to laminar bottom in erect pipeline is distinct and bigger than viscosity difference. The theory that oil with smaller density is at bottom of pipe, forming the length of contamination is not obvious and shorter than contrary direction at shutdown is also testified. The study has the theoretical guidance significance to reduce contamination at shutdown and track contamination interfacial and incise on breaking down and restart of pipeline.

Key words: batch transportation, shutdown, contamination, numerical simulation, PHOENICS