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In this contribution a numerical study of a turbulent jet flow is presented.The simulation results of two different variants of the Lattice Boltzmannmethod (LBM) are compared. The first is the well-established D3Q19 MRT modelextended by a Smagorinsky Large Eddy Simulation (LES) model. The second is theD3Q27 Factorized Cascaded Lattice Boltzmann (FCLB) model without any additionalexplicit turbulence model. For this model no studies of turbulent flow withhigh resolution on nonuniform grids existed so far. The underlyingcomputational procedure uses a time nested refinement technique and a grid withmore than a billion DOF. The simulations were conducted with the parallel multiphysics solver VIRTUALFLUIDS. It is shown that both models are feasible for thepresent flow case, but the FCLB outperforms the traditional approach in someaspects.

Turbulent jet computations based on MRT and Cascaded Lattice Boltzmann models