Simulation of a turbulent flow around a moving circular cylinder using the LBM

0468462 - ÚH 2017 RIV DE eng C - Konferenční příspěvek (zahraniční konf.)
Dolanský, Jindřich
Simulation of a turbulent flow around a moving circular cylinder using the LBM.
2016.
[International Conference for Mesoscopic Methods in Engineering and Science /13./. Hamburg (DE), 18.07.2016-22.07.2016]
Grant CEP: GA ČR GA15-18870S
Institucionální podpora: RVO:67985874
Klíčová slova: Lattice Boltzmann method * moving cylinder * Smagorinsky subgrid model
Kód oboru RIV: BK - Mechanika tekutin

The unsteady flow incited by motion of a circular cylinder in a rectangular container in water is examined by the Lattice Boltzmann Method (LBM) based simulation. The variable velocity of the cylinder is controlled by an electrical device. First the cylinder approaches the bottom, then it rests for some time at the bottom, and finally it leaves along the original path. The turbulent flow around the cylinder arises as the Reynolds number of the cylinder is Re ~ 10^3 - 10^4. The most important advantage of the LBM consists in the possibility of overall parallelization of the algorithm which is enabled by its local dynamics. However, there are still accuracy and stability issues to be established. For high values of the Reynolds number the LBM can be subject to numerical instabilities which are caused by incapability of the LBM to dissipate energy at the sub-grid scale due to very large gradients. Hence, the turbulent flow is simulated with the help of the LBM enriched with the Smagorinsky subgrid model. The correctness of the simulation is validated against experimental outputs.
Trvalý link: http://hdl.handle.net/11104/0266317