Numerical Simulation of the Transport of Volume Expansion Particles in Fluid Flows

摘要

In this article a method is presented to compute the particle motion of arbitrarily shapedparticles in various geometries. In contrast to the classical Lagrangian approach, where everyparticle is considered as a mass point without volume expansion, now the particles areconsidered as rigid bodies with their finite expansions. Determination of the translational andangular velocities of the particles is done by integration of viscous and pressure forces over allsurface elements at the particle. The model is linked to the commercial CFD softwareFluent? by means of user-defined functions (UDF). Dynamic mesh models in Fluent? areused to model the particle motion in the computational domain. The mesh structure ischanging with time due to motion of particle boundaries. This simulation tool is able tocalculate detailed information of the complex interactions between particles and fluid flows.The particle-wall collisions can also be simulated in detail which is very important to getaccurate knowledge of the deposition in separation processes. Information from theseextensive flow simulations is then used to get simplified calculation models for theLagrangian approach.This procedure contains a huge potential for numerical calculations of particle loaded flows.