ENERGY CONSERVATIVE DISSIPATIVE PARTICLE DYNAMICS SIMULATION OF MIXED CONVECTION IN COMPLEX GEOMETRIES WITH MOVING SURFACE

In this article, dissipative particle dynamics with energy conservation (eDPD) is applied to simulate mixed convection heat transfer in complex geometries with moving surface. And this is the first time a particle based approach is successfully applied to simulate the fluid-structure interaction problem in such complex geometries. A numerical strategy is presented for dealing with irregular geometries with moving surface in DPD system and this is very useful for extending the application of DPD (or any other particle-based simulation method) to mimic hydrodynamics in arbitrarily complex geometries, like geometries with moving surface or freeform surface which cannot be defined by mathematical functions. And thanks to the strategy, eDPD mode adequately demonstrates its advantage of simulate complex convection in irregular domains with moving surface. Because of the soft potentials employed between the particles, fluid particles in DPD system may penetrate the boundary. Some measures of remediation like different types of reflection will be imposed to avoid the penetration of fluid particles, but it is difficult when the simulation domains are irregular. And there are many other issues when the eDPD method is applied to simulate the flow and heat transfer in irregular geometries. All of these issues are solved completely and skillfully. The streamlines and temperature distributions are obtained. The eDPD results for heat transfer are compared to the finite volume solutions and the experimental data, and it is found that the temperature and flow fields in complex geometries are correctly predicted using eDPD model.