| Mon October 3rd 2011 16:00 ZH286 | Seminar | Fully-resolved simulation of dense gas-particle flow Martin van der Hoef |
Details:We have recently developed a new computational fluid dynamics code for fully-resolved flow past spheres and cylinders. The interaction between the fluid and the surface of the particles is handled by the Immersed Boundary (IB) method, as introduced by Uhlmann (2005).In this presentation, we first discuss the basic numerical model, where we have made some adaptions to the original method by Uhlmann. Validation of the model follows from comparison with available theoretical and simulation data for the drag force in dense regular and random arrays. A second, more critical, test is if the IB method can adequately model the hydrodynamic interaction force between moving spheres. The results are compared with exact (numerical) solutions of the Stokes equation using a multipole-expansion method, as well as with simulation results obtained with the well-established lattice-Boltzmann (LB) method. Finally we apply our model to simulate a gas-fluidized bed of up to 2000 particles. To our knowledge this is the first fully-resolved simulation of such a system. We compare the results with those from state-of-the-art simulations using a standard (unresolved) discrete particle model. | ||
