The present simulations show a significant improvement in the separation-bubble length prediction compared to Reynolds-Averaged Navier-Stokes calculations. The high Reynolds number of the problem necessitates a significant number of grid points for wall-resolved calculations. The momentum-thickness Reynolds number of the incoming boundary layer has a value that is near the upper limit achieved by recent direct numerical simulation and large-eddy simulation of incompressible turbulent boundary layers. Despite its conceptually simple flow configuration, this benchmark problem has proven to be a challenging test case for various turbulence simulation methods that have attempted to predict flow separation arising from the adverse pressure gradient on the aft region of the hump. Combined with the high efficiency of the numerical method, developments following the described strategy are expected to evolve further and allow additional industrial deployment.read more read lessĪbstract: This paper reports the findings from a study that applies wall-resolved large-eddy simulation to investigate flow separation over the NASA wall-mounted hump geometry. The results provide a good overview of the high accuracy achieved for transitioning and separated turbulent flow situations and the mechanisms initiating the switch from mainly modeled to mainly resolved turbulent flow structures. Simulation results of a simple shear layer flow, a smooth body separation on the NASA Hump and iced airfoils are documented. The focus is put on representative simulation examples including a direct numerical simulation of a channel and the NACA0012 airfoil at a chord Reynolds number of 657,000 resolving all the turbulent scales and several fundamental cases increasing in flow and geometric complexity demonstrating the hybrid turbulence approach which is resolving only the large coherent turbulent structures, while smaller turbulent flow structures are modeled. Abstract: This paper summarizes the fundamental concepts behind the lattice Boltzmann approach for scale-resolving numerical flow simulations with a brief description of the solver algorithms and models in the lattice Boltzmann-based code PowerFLOW.
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