Numerical Simulation Of Polymer Flow With Dissipative Particle Dynamics Method

The behaviour of polymer liquid observed in macro-scale is decided by its micro-structure. Some polymer liquid's characters depond on its molecule assembling structure rather than molecule structure. This requires the simulating techniques have to be mesoscopic scale. Cellular automata and Boltzmann method are the mesoscale numerical simulation techniques, but they are hard to handle complex fluids. Molecular dynamics method involves too much calculation, it does not work either. Dissipative particle dynamics (DPD), whose basic unit is known as the momentum vector particles representing a large number of elements of collective behavior, is an emerging mesoscale numerical simulation technique. The superiorities of DPD method are that it can easily simulate the fluid system and get more meso-scale information.In this paper,the dynamic behavior of polymer to be discussed with dissipative particle dynamics method.The conduct of paper include:1 .Discuss the systematic process that how to use DPD. Including its basic idea, a detailed algorithm and the method that how to select various parameters and so on.2.Simulate the simple Poiseuille fluid flow with DPD method.Compare the simulate results with the theoretical analysis of solution and research results by others to verify the correctness of the procedure. Simulate result of the fluid flow in square microchannel coincide with software simulation result.3.Simulate the polymer fluid flow with DPD method.Calculate the rheological properties of polymer fluid in mesoscopic scale. Combinate the classic theory of fluid dynamics equations and DPD method to introduce the macro-micro coupled simulation.In this study,use the dissipative particle dynamics method in the simulation of polymer fluid flow behavior, provide a more profound understanding of fluid flow rheological properties.