Dissipative Particle Dynamics With Energy Conservation Fundamental Simulation Of Mescopic Heat Transfer

In addition to the molecular level and macro level, we can also choose themesoscopic level to desript the nature. It is due to the fact that in many cases thebehavior and structure on mesoscopic level is important to understand the macroscopicphenomena, e.g. polymer rheology, block copolymer microphase separation andsuspension. Dissipative particle dynamics(DPD) is such a level simulation skill. Also, itis a kind of particle based method, have the gift in the simulation of complex fluids. Atfirst, DPD can not used to simulate heat flow, called DPD-e model. By the work ofEspa ol and Avalos、Mackie, the model is modified(dissipative particle dynamics withenergy conservation, DPD+e) to solve this problem. When the particles do not move,the model retrogress to heat conduction DPD model(HC-DPD). Based on above model,this thesis have simulated the one-dimensional, two-dimensional heat conduction andthe forced laminar convection heat transfer phenomena.The main work in this thesis:Use the HC-DPD to study the one-dimensional transient heat conductionphenomena, verify the theoretical relationship between the mesoscopic thermaldiffusivity and macroscopic thermal diffusion coefficient. Used this model to simulatethe two-dimensional heat conduction phenomena in three boundary conditions, thetemperature distribution geted consitents well with the results from FLUENT.Use the DPD+e to study the one-dimensional transient heat conduction phenomena,find the macroscopic thermal diffusion coefficient correpond to the same mesoscopicthermal diffusion coefficient in HC-DPD is also the same as HC-DPDUse DPD-e to simulate the poiseuille flow, implement the no-slip boundaryconditions successfully, get the right velocity distribution as theoretical predict.Use DPD+e to simulate the forced laminar convection heat transfer, get thedimensionless temperature distribution, based on which we get the right nusselt numberas the theoretical predict...