A comparative study of three-dimensional discrete velocity set in LBM for turbulent flow over bluff body

The work presented in this paper investigates the efficiency of various (i.e., D3Q15, D3Q19, and D3Q27) three-dimensional discrete velocity models of lattice Boltzmann method (LBM) for the simulation of turbulent flow past over a bluff body. The numerical setup consists of a square cylinder confined in a rectangular duct. Large eddy simulation (LES) model has been used for the simulation of turbulent eddies. The small-scale turbulent structures were resolved by using the conventional Smagorinsky subgrid-scale (SGS) model. The computations have been carried out on a uniform Cartesian grid. The results for different turbulent statistics have presented and compared with the available experimental and previous numerical (based on finite volume approach) results for Reynolds number Red= 3000. The algorithm developed for the present simulation has been parallelized to run on Graphical Processing Unit (GPU) parallel platform.