Numerical Simulation Of Flow Around An Oscillating Cylinder Using Lattice Boltzmann Method

Lattice Boltzmann Method (LBM) is a new numerical method of fluid dynamics, whichis originated from lattice gas automata (LGA) at the end of 1980's. LBM is based on the levelof micro-particles to simulate the fluid which is different from the conventional numericalmethods. The distribution function equations are classic Boltzmann equation. A singleparticle distribution function is LB equation's parameters. LBM has more advantagescompared with traditional numerical methods. Such as, a simple algorithm, easy programming,natural parallel, pressure can be solved through direct equation of state.LBM have developed quickly on hydrodynamics calculations in recent years, whichhave taken it to the point where it can successfully compute a number of non trivial flows,raging from homogeneous incompressible turbulence to multiphase flows in porousgeometries in recent years. Yet, it is apparent that there is still a way to go before LBM canachieve full engineering status. For example, the study of fluid movement with movingboundary In order to expand the scope of LBM application areas, the paper focuses on theLBM methods to deal with moving boundary and numerical simulation of the flow around acylinder oscillating.The flow around an oscillating cylinder is a classic problem, there are rich content, alarge number of relevant theory experiment and calculation about which. When a cylinderoscillates transversely in a uniform stream, if vibration frequency ratio f_e/f_s～1. That is,oscillating frequency equates approximately naturally vibration frequency of vortex sheddingfrequency, there is phase change. When a cylinder oscillates longitudinal in a uniform stream,cylindrical vibration frequency and amplitude affect vortex shedding patterns. The differentvibration frequency and amplitude, there will be various forms of vortex shedding patterns.The flow around a cylinder oscillating transversely in uniform stream is simulated. The resultcompared with other numerical simulation data is in good agreement. Then, numericalsimulate the flow around a cylinder oscillating longitudinal investigate that the flowcharacteristics and the impact forced in the flow around an oscillating cylinder. Mainly vortexmode shedding from the cylindrical tail and the lift coefficient or drag coefficient affected bythe cylinder vibration frequency and amplitude. From the calculated results, I Summed upthree vortex shedding patterns, and analysed the three patterns and vortex shedding vortexshedding frequency. In the paper, numerical simulation the flow around a oscillating cylinder using LBM Thesimulation results shows the method in dealing with the moving boundary is reasonable. Atthe same time the analysis of vortex shedding patterns when cylinder oscillate longitudinal inthe uniform stream provide a reference value for similar projects...