Lattice Boltzmann Simulation Of The Flow Around Cylinders And Particle Suspension Flow

The lattice Boltzmann method is a new numerical method which is rapidly developedin the past decades. This method has achieved initial success in the application in theoryand industry, such as turbulence flow, multiphase flow, particle suspension flow,micro-scale flow and so on. The particle suspension flow is mainly discussed in this paper.Detailed comparative study of the model of the lattice Boltzmann method and thecurve boundary treatment is conducted firstly. And the results show that more accurateresults can be obtained from He-Luo model and LB-MRT model. Comparing to theinterpolation treatment methods, the external boundary force behaves more stable in themoving curve boundary, with small additional fluctuations.As followed, the rotation and oscillation effects are discussed by simulation of theflow of a rotating/oscillating cylinder and a fixed cylinder in tandem. When the upstreamcylinder rotates or oscillates, the stagnation region, which appears in the fixed tandemcylinder, is no longer exists. And the transition from the alternate attachment region to thevortex shedding region occurs earlier. For the flow around a heated moving cylinder, theheat transfer from the surface of the oscillating cylinder can be enhanced obviously withsmall amplitude and low frequency oscillation. On the contrary, it will be reduced.At last, the sedimentations of one or more particles are simulated by LBM-EBF. Theclassic ‘Drafting-Kissing-Tumbling’ phenomenon has been shown in the discussion.Furthermore, the two particles interaction, which plays an important role in the dynamics ofthe settling particle, is divided into three parts: attraction, repulsion and transition.